I am looking for a 'vibe coder' to develop a mobile application for iOS and Android. The app should allow users to upload receipts and receive notifications about price drops on purchased items. We prioritize speed and cost-effectiveness, leveraging AI assisted development in the creation of this app.

IMPORTANT: The budget for this project is FIXED, we need someone that is familiar with using AI like Claude and Codex that has created mobile applications in the past.

• Register & configure the domain
• Set up hosting & connect everything correctly
• Design & develop a modern, mobile friendly dating website
• Member registration, log in & account management
• User profiles with photo up loads & personal information
• Membership plan & secure payment integration
• Admin dashboard for managing members & website content
• Full testing across mobile, tablet & desktop platforms
• Admin training & 30 day warranty support
• Cannot be an AI designed website
• Must be custom made similar to zoosk

website design for mediation firm, pages: about, bio, services, FAQ and contact us

We are building Carl, a premium personal concierge app. Users submit tasks by voice or text. A live human agent is assigned within 60 seconds. The AI layer handles intake and prep. The human executes. Think of it as the opposite of a chatbot. The app is minimal and clean, all the magic happens behind the scenes.
What We Are Building
A React Native mobile app (iOS and Android) plus a web based agent dashboard and admin panel. The core flow: user submits a task via voice or typing, AI parses it and surfaces everything the agent needs, agent executes and updates the user in real time.
Key Features
Voice and text input on every screen, always
Task submission with AI assisted prep (task type detection, profile matching, smart follow up questions)
Live agent assignment within 60 seconds with real time status updates
Agent dashboard showing all active tasks, user profiles, saved preferences, and task history
Parent and subtask structure for multi part requests (trips, events, errands)
Itinerary card that assembles automatically when all subtasks are complete
User profiles with saved cards, preferences, linked accounts, and child account controls
Family plan with up to 5 members, PIN or approval mode for child accounts
Subscription billing via Stripe
Round robin agent assignment with calendar reminders and 15 minute pre task pings
Auto approve mode and user set spending thresholds
Alexa integration architected from day one (V1 does not have to be live, but the structure must support it)
Backend toggle for hours of operation (beta is 7am to 11pm CST, 24/7 when ready)
Tech Stack
We are open to your recommendation but expect React Native for mobile, Node.js backend, and a clean REST or GraphQL API. ElevenLabs or equivalent for the Carl voice layer. Stripe for billing. Push notifications required.
Logo Animation
The C logo morphs into a pulsing circle when Carl is thinking, snaps to a checkmark when done, returns to C. Must be smooth and satisfying.
What We Need From You
Full mobile app (iOS and Android) built to spec
Agent web dashboard
Admin panel
Backend API
App store ready builds for both platforms
Clean, documented code we own 100%
Timeline
max 8 weeks. We are ready to start immediately.
Who Should Apply
Teams or individual developers with React Native production apps in the App Store. Show us something you shipped. Eastern Europe and Latin America welcome. English communication required. Fixed price bids only.
To Apply
Send your fixed price bid, two or three apps you built and shipped, and a one paragraph summary of your approach. No agencies please.

Overview

We are seeking a highly skilled Senior .NET Full Stack Engineer with 7+ years of professional software development experience to join our team. The ideal candidate will have strong expertise across modern .NET technologies, frontend frameworks, API development, and enterprise application architecture.

This role involves direct collaboration with US-based stakeholders and technical teams. Strong communication skills and the ability to participate in technical discussions are essential.

Responsibilities

Design, develop, and maintain scalable web applications and APIs.
Build modern, responsive frontend applications using Angular and/or React.
Develop backend services using .NET technologies and best practices.
Design and implement RESTful APIs and microservices.
Collaborate with product owners, architects, and stakeholders.
Participate in architecture discussions, code reviews, and technical planning.
Troubleshoot and optimize existing applications.
Ensure code quality, maintainability, security, and performance.

Requirements

7+ years of professional software development experience.
Strong expertise in C#, .NET Framework, and ASP.NET Core.
Strong frontend experience with Angular and/or React.
Experience designing and consuming REST APIs.
Experience building and supporting enterprise applications.
Strong understanding of software design patterns and best practices.
Experience working with SQL Server and relational databases.
Ability to work independently and take ownership of deliverables.
Professional-level English fluency (equivalent to CEFR C1/C2).
Availability to provide at least 4–6 hours of overlap with US business hours (EST/CST preferred).
English Communication Requirement

Candidates must be comfortable:

Participating in video meetings and technical discussions in English.
Communicating technical concepts clearly and professionally.
Collaborating in a fully English-speaking environment.
Working directly with business stakeholders and technical teams.

Application Requirements

Please submit:

Updated Resume/CV
Relevant Project Examples
Hourly Rate
Availability for US business hour overlap
A brief 2–3 minute video introduction in English covering:
Your professional background
Your experience with .NET, Angular, and/or React
A recent project you are proud of
Your availability for US time zone collaboration

The video introduction will be used to evaluate communication skills and overall fit for this role.

Job Details
Job Type: Remote Contract
Experience Required: 7+ Years
Working Hours: Minimum 4–6 hours overlap with US business hours (EST/CST preferred)
Contract Length: Long-Term Preferred
Ideal Candidate

You are a senior engineer who can:

Build scalable, maintainable applications.
Work independently with minimal supervision.
Communicate effectively with clients and stakeholders.
Contribute to architecture and technical decision-making.
Thrive in a collaborative, remote environment.

We are looking for a strong engineer with excellent communication skills who can make an immediate impact on our team.

This is a HALF TIME position Monday - Friday, 9am-1pm PDT role for $500/mo and we are looking to hire you on for 6 months. Hence 6 x $500/mo = $3000. You will be expected to be present and working with us during these hours. We have weekly meetings and commnuicate daily via slack. You are not to be working on other projects at this time. We will expect you to be fully engaged.

We are seeking a skilled WordPress developer to help make updates to our website. We are rebranding and making changes to our site including changing out photos/videos, updating text, and creating new pages.

The ideal candidate will have experience in web development and design, with a strong understanding of PHP. Responsibilities include updating existing features, ensuring site functionality, site speed, and enhancing user experience. The project requires a minimum INTERMEDIATE level of proficiency and will be an ongoing role.

You will also be helping us to update our canva and marketing decks so you should be well versed in design elements.

"We are seeking a lead Flutter developer or boutique agency to build SPNNIT, a dual-discipline tennis and pickleball tournament platform. All UI/UX Figma designs and a comprehensive 26-specification technical doc are 100% complete.

Scope includes Flutter cross-platform mobile build (iOS & Android), Firebase integration (Auth, Firestore, FCM), real-time WebSocket coin toss engine, single-elimination bracket views, and in-app messaging.

Must have a proven track record of shipping live apps to Apple App Store and Google Play. To verify you read this posting, please start your reply with the word 'PALLAS'."

I am seeking an experienced and inventive Mechanical Engineer/Product Design Expert to help develop a novel mechanical system for on-site electricity generation.

This is an invention-led engineering project, not a conventional feasibility study.

The project has a fixed underlying mechanical principle that will be disclosed following initial discussions and an NDA. The engineer’s role is to innovate from that foundation and develop mechanical solutions capable of meeting a defined performance specification.

The Challenge

The system must ultimately be developed toward:

sustained electrical output for approximately four hours;
defined electrical performance targets;
strict mass and packaging constraints;
safe and reliable operation; and
a practical working prototype.

I am looking for an engineer who enjoys difficult mechanical problems and can move beyond analysing existing solutions to inventing new mechanisms, configurations and engineering approaches.

The work may involve:

mechanical concept development;
energy, torque, gearing and power-transfer calculations;
development of mechanisms and subsystems;
component selection and custom component design;
optimisation of mechanical losses and performance;
CAD and mechanical design;
identifying and solving engineering bottlenecks;
iterative design development; and
planning and supporting prototype development and testing.

The core mechanical foundation is a project constraint rather than something to be replaced. There is, however, significant freedom to innovate around its configuration, architecture, energy transfer, control and supporting mechanisms.

Who I’m Looking For

Ideally, you will have strong experience in mechanical product development, mechanisms, power transmission, energy systems, electromechanical products, prototyping or similar fields.

I am particularly interested in engineers who are comfortable working on unconventional problems where the solution is not already known and who enjoy inventing toward demanding technical requirements.

Confidentiality & Intellectual Property

Further technical details will be provided to shortlisted candidates following an initial discussion and NDA.

The successful engineer will also be required to enter into an intellectual property agreement. All project-specific inventions, designs, developments, drawings, CAD files, calculations, technical documentation and other intellectual property created specifically through the engagement will be assigned and transferred to me upon payment in accordance with the agreed contract.

Any pre-existing intellectual property owned by the engineer prior to the engagement should be identified separately before work begins.

Initial engineering development budget: approximately $10,000, with scope, milestones and any subsequent development phases to be agreed.

Title: Mobile App for Intelligent SIM Selection, Automatic Failover and Multi-SIM Bonding

We are looking for a highly experienced mobile-networking developer to design and build an application that improves connectivity when national roaming is unavailable.

The application should analyze the performance of available SIM/eSIM connections and determine which mobile network provides the best real-world quality and reliability.

In addition to intelligent SIM selection, we want to investigate and implement simultaneous multi-SIM bonding or seamless failover wherever supported by the device and operating system.

This is an advanced networking project, not simply a mobile user-interface project. Applicants must understand mobile connectivity, multiple network interfaces, traffic steering, tunnelling and session continuity.

CORE OPERATING MODES

1. Intelligent SIM Selection

The application should evaluate available SIM/eSIM connections using relevant radio and end-to-end performance indicators, including:

- Signal quality
- Network technology
- Latency
- Jitter
- Packet loss
- Upload and download performance
- Connection stability
- Recent disconnections
- Internet and DNS reachability
- Congestion
- Data usage, quotas and cost
- Battery consumption

The application should:

- Calculate a network-quality score
- Recommend the most reliable network
- Explain why a network is preferred
- Avoid unnecessary switching
- Maintain network-performance history
- Allow configurable selection policies

The developer must determine which measurements can be collected reliably and explain all hardware, operating-system, carrier and permission restrictions.

2. Automatic Failover

When the active connection fails or falls below configurable thresholds, the application should switch traffic to the best available alternative wherever technically possible.

The solution must:

- Detect outages and degradation rapidly
- Avoid failover caused by temporary fluctuations
- Prevent repeated switching between similar networks
- Maintain active sessions wherever possible
- Handle IP-address changes
- Return to the preferred network only after it becomes stable
- Provide an assisted fallback when automatic switching is restricted

The application must clearly indicate whether failover is automatic, assisted or unavailable on the current device.

3. Multi-SIM Bonding

We want the developer to investigate whether two or more SIM/eSIM mobile-data connections can be used simultaneously on one mobile device.

Where supported, the solution should combine the available mobile connections through a remote aggregation platform to provide:

- Improved connection reliability
- Continuity if one mobile network fails
- Intelligent traffic distribution
- Potential bandwidth aggregation
- Dynamic adaptation to latency, jitter, loss and congestion
- One stable logical connection for applications
- Per-connection monitoring and statistics

Expected operating policies include:

- Performance mode
- Reliability or redundancy mode
- Balanced mode
- Backup-only mode
- Data-cost or quota-aware mode

The developer must independently determine:

- Which devices genuinely support simultaneous mobile-data connections
- Whether compatibility depends on a specific chipset, model, regional version or firmware
- Whether the operating system exposes the connections independently
- Which permissions or commercial relationships are required
- Whether the application can be distributed through official app stores
- Which features require manufacturer or operator integration
- What fallback behavior should be used on unsupported devices

The application must not assume that every Dual SIM phone provides two simultaneous Internet connections.

ADDITIONAL CONNECTIVITY OPTIONS

The developer should evaluate whether the same architecture can support:

- Wi-Fi and mobile data
- Multiple mobile connections
- A mobile connection and an external hotspot
- A mobile connection and a tethered modem
- Other network interfaces exposed by the device

The application should automatically detect available connectivity options and display only the modes genuinely supported by the device.

AGGREGATION PLATFORM

If bonding requires a remote component, the developer must design and deliver the corresponding aggregation-server architecture.

The proposal should explain:

- The tunnelling and communication architecture
- Traffic-distribution method
- Session-preservation mechanism
- Packet-ordering strategy
- Handling of paths with different latency and bandwidth
- Failure-detection mechanism
- Encryption and authentication
- Scalability
- Monitoring
- Deployment and operational requirements

We are open to standard or proprietary approaches, but the developer must explain and justify the selected architecture.

MOBILE APPLICATION INTERFACE

The application should display:

- Available SIM/eSIM profiles
- Active mobile network
- Quality score for each connection
- Current operating mode
- Connection status
- Latency, jitter, loss and estimated capacity
- Traffic transferred through each connection
- Bonding contribution per connection
- Failover and switching history
- Data usage and quotas
- Automatic and manual controls
- Reasons for network-selection decisions
- Device compatibility status
- Clear explanations when a feature is restricted or unavailable

ANDROID AND IOS

The proposal must include separate feasibility analyses for Android and iOS.

The applicant must identify:

- What is possible through a normal consumer application
- What requires additional permissions or entitlements
- What requires manufacturer or operator cooperation
- What depends on specific hardware
- What can be published through official app stores
- What cannot be implemented reliably
- Whether the solution can carry all device traffic or only application-generated traffic

Restricted or unsupported functions must not be simulated or presented as operational.

MANDATORY FEASIBILITY PHASE

The project must begin with a technical feasibility and proof-of-concept phase before complete application development.

During this phase, the developer must:

1. Identify suitable commercially available test devices.
2. Identify the required SIM/eSIM and operator configuration.
3. Determine whether multiple independent mobile-data paths are simultaneously accessible.
4. Demonstrate independent traffic through each usable connection.
5. Determine whether traffic can be controlled separately for each connection.
6. Demonstrate the proposed failover mechanism.
7. Demonstrate simultaneous use of multiple connections wherever supported.
8. Measure throughput, latency, jitter, loss and continuity.
9. Document all hardware, firmware, permission and carrier dependencies.
10. Provide a clear Go/No-Go recommendation.

Complete product development will proceed only after successful validation of the feasibility results.

SECURITY AND PRIVACY

The solution must include:

- Strong traffic encryption
- Secure application and server authentication
- Certificate validation
- Secure credential and token storage
- Protection against DNS and traffic leaks
- Minimal collection of subscriber information
- User consent for measurements and VPN operation
- Secure telemetry transmission and storage
- Compliance with privacy and app-store requirements
- Protection against unauthorized use of the aggregation platform

DELIVERABLES

- Technical feasibility report
- Device and operating-system compatibility matrix
- Hardware, firmware and permission requirements
- Architecture and data-flow diagrams
- Functional mobile proof of concept
- Remote aggregation proof of concept, if required
- Measured test results
- Go/No-Go recommendation
- Complete mobile application source code
- Server-side source code
- Build and deployment instructions
- API and protocol documentation
- Security documentation
- Test plan and acceptance report
- Production deployment recommendations
- Known-limitations document

ACCEPTANCE CRITERIA

The project will not be accepted based only on a graphical interface, theoretical documentation or simulated network information.

The proof of concept must demonstrate, wherever supported:

- Measurements collected from real mobile networks
- Correct identification of available subscriptions and connections
- Independent verification of each Internet path
- Real simultaneous traffic across multiple connections
- Traffic continuity after one connection is interrupted
- Accurate per-connection statistics
- Stable switching without continuous oscillation
- Clear behavior on unsupported devices
- Reproducible installation and testing
- Documented restrictions and dependencies

The developer must not replace a second mobile connection with Wi-Fi without clearly disclosing and documenting the difference.

REQUIRED EXPERIENCE

Applicants should have strong, demonstrable experience in:

- Mobile networking
- Android and/or iOS connectivity frameworks
- SIM/eSIM and cellular-network behavior
- VPN or tunnelling applications
- Multi-interface traffic management
- Session continuity
- Linux networking
- Remote aggregation systems
- Packet scheduling
- Network measurement and monitoring
- Mobile security
- Production mobile application development

QUESTIONS FOR APPLICANTS

Please answer every question. Generic proposals will not be considered.

1. Can two SIM/eSIM mobile-data connections be used simultaneously on one Android device? Explain the exact conditions and limitations.

2. Can the same functionality be implemented on iOS? Clearly separate bonding, failover and assisted SIM selection.

3. Which commercially available devices would you select for the proof of concept, and why?

4. How would you verify that a device exposes two genuinely independent mobile Internet paths?

5. How would you ensure that traffic is transmitted through the intended SIM connection?

6. What permissions, system access, manufacturer support or operator cooperation may be required?

7. How would you design the bonding and aggregation architecture?

8. How would you preserve active sessions when one connection fails or changes its IP address?

9. How would you manage connections with significantly different latency, jitter, loss and bandwidth?

10. How would you prevent packet reordering or a poor connection from degrading the combined service?

11. Can the solution carry all device traffic or only traffic generated by the application?

12. How would you minimize battery and data consumption while continuously measuring network quality?

13. What is the most important technical risk in this project?

14. What must be proven before proceeding with complete development?

15. Please provide examples of relevant mobile-networking, VPN, tunnelling or multi-connectivity work.

IMPORTANT

We are seeking an engineer who will validate the concept honestly before proposing complete development.

Applicants claiming that all Dual SIM smartphones automatically support simultaneous multi-SIM bonding, without explaining the hardware and operating-system restrictions, will not be considered.

The proposal must clearly distinguish:

- What is technically possible
- What is possible only on selected devices
- What requires privileged integration
- What can be distributed commercially
- What is not currently feasible

Hello! We're Volgin Naturetech, a doctor-founded, artisan wild-fermentation company producing organic fermented foods in Houston, Texas. We combine microbiology and human-health research with modern, tightly controlled production designed by an engineer cofounder to produce award-winning foods unmatched in nutrition and quality.

Volgin currently delivers in Houston and Austin and is preparing for refrigerated national DTC shipping. Our website is currently functional, but we need a systemic, considered redesign that builds the trust foundation for purchases, subscriptions, practitioner referrals, education-led discovery, customer referrals, sampling, influencers, and paid traffic.

Our important markers for success in this build include:

1. Within five seconds, a first-time visitor understands what Volgin sells, why its fermentation is different, and whether to shop locally or join the national waitlist.

2. That same five seconds has to land emotionally, not just functionally: wow, this is inspiring - I’ve found the golden nugget, the real deal, not another wellness knockoff. The visitor feels an immediate pull to be part of this movement, trusts it because the science feels visibly credible, and senses genuine FOMO at the idea of not buying. This emotional reaction is the actual design target; comprehension alone is not success.

3. The design feels clean and considered like Oma Seaweed and Organised.co, but unmistakably Volgin: science-forward, artisan, human, vibrant, and never a generic beige wellness reskin.

Hello! We're a company in Houston, Texas that produces doctor-created, wild-fermented foods. We have a functional, solid website, but we'd like to perfect it before we launch nationally later this year. We need full, national-scale, integrated, automated backend functionality for explosive growth - we're looking for a seasoned, talented Shopify expert who has extensive experience in Shopify buildout and can help guide an industry-leading company with industry-leading backend e-commerce setup. We need our website to be our backbone that increases our efficiency, conversion and growth.

We'd work together in a 4-week sprint to get this up and going asap, and you'll have full access to the operations/marketing co-founder for round-the-clock questions or support.

Please see the attached full job description for more details!

We are looking for an experienced AI engineer or full-stack developer to build a simple internal AI platform for our fashion e-commerce company. It will initially be used by 5–10 employees and should focus on three functions:

Influencer Discovery: Find relevant Instagram and TikTok influencers based on niche, location, keywords, follower count, engagement rate, audience, and brand fit. Show social profiles, engagement information, and publicly available contact details.
Influencer Outreach: Locate public business contact information, generate personalized AI outreach messages, organize influencer lists, and keep basic records of who has been contacted.
Trend Research: Identify fashion, beauty, lifestyle, and social-media trends, including products, styles, colors, keywords, hashtags, sounds, and content formats. Research sources may include TikTok, Instagram, Google Trends, and third-party data providers. The platform should explain why trends are growing and recommend relevant product and content ideas.

Please include your recommended approach, technology, APIs or data providers, development timeline, total cost, monthly operating costs, relevant examples, and confirmation that we will own the platform and source code. We are open to starting with an MVP and expanding later.

We are a DTC supplement brand launching our TikTok Shop from scratch. Registration is done, everything else is open. We want one operator or agency to take full, near full-time ownership and run it end to end: connect TikTok Shop to Shopify and to Amazon Seller Central, build and run a creator/affiliate Discord community, source, recruit and onboard creators, write scripts and briefs across all angles, and manage the entire operation including catalog, promotions, campaigns, affiliate program and reporting. US TikTok Shop experience required, supplement or health experience is a strong plus. This role is only for people who can prove results. In your proposal, share your top 3 demonstrable TikTok Shop wins, with numbers and proof (dashboards, screenshots, live store links). No proof, no consideration. Compensation is a monthly retainer plus revenue share.

Soft goods & mechanical engineer to develop a wearable inflatable rescue device

I'm building a wearable device that can inflate a 50N rescue float from a small armband in seconds, with no compressed gas, no cartridge and no pressure vessel anywhere in the product. The chemistry is done and validated. What I need now is someone who can help me turn it into a real, wearable, manufacturable product. We have lifeguards interested, swimmers interested, parents interested and the general public. We think we can make something amazing out of this and make water safety as universal as helmets. Together, we can save thousands of lives.

Roughly 120 mL of two harmless liquids sit in two sealed chambers. You pull a cord, the separator between them is removed (I imagine a system sort of like where pulling it makes holes align to remove between the two chambers), they mix, and the reaction generates about 5.2 L of CO₂ that inflates a folded bladder. The bladder then releases from the armband onto a tether so it floats in front of the user's chest, where they can hold onto it like a rescue tube.

I am looking for textile, soft goods, wearable and mechanical engineering help to design, prototype and iterate that physical product, and to do it in a way that gets cheap, light and mass-manufacturable, not just clever and expensive. We want to save lives and we want to make it cheap - let's do it together!

Why this matters

Drowning is one of the few major causes of preventable death that has barely moved in fifty years. Thousands of people die every year and millions get really close to death, or result with significant injury. Most die within metres of safety, with people losing consciousness as quickly as two minutes. A large share of drownings happen outside patrolled hours or away from the tower, where no lifesaver is coming.

The other brutal statistic is that a significant number of drowning deaths are the would-be rescuers — untrained bystanders who went in without flotation.

I'm a patrolling surf lifesaver, rescue boat driver and patrol captain. I've done this work.

The first rule of every rescue is that you never enter the water without something that floats, and the reason people drown is almost never that flotation is expensive or complicated. It's that it's inconvenient enough that they leave it at home. People don't like big lifejackets or even tiny pouches like Restube (please research them). They draw attention, bounce around, look silly, and affect swimming.

I want to remove the inconvenience. The goal is a device cheap and comfortable enough that wearing one is as unremarkable as putting on a bike helmet.

Why the chemistry approach is the whole point:

Every comparable product on the market — Restube, Kingii, Minifloat Ltd — uses a compressed CO₂ cartridge. That constraint is what I've removed, and it changes almost every downstream decision:
No cylinder. No compressed gas means no dangerous goods classification, no airline restrictions, no cylinder re-certification, no cartridge to replace or forget to replace.

Long shelf life is already solved. The chemicals themselves comfortably achieve 5+ years of stable shelf life.

I'm a chemist and physicist myself so the science and modelling is done and set. But I just am very bad at building.

The end device can be extremely cheap. No pressure vessel, no valve, no regulator. The bill of materials can go somewhere cartridge devices can't follow.

Retail-friendly. It can ship in a padded envelope, sit on a shelf, and go in carry-on luggage.

If anyone tells you a 5 L bladder can't pack down into an armband, those three companies, especially Minifloat Ltd, are the existence proof that it can.

Where I'm up to:

Done, settled:
Full chemistry developed and validated, a two-liquid, extremely safe system. You will not need to touch the chemistry unless specific challenges arise in which case I will work through the chemistry with you; that's all on me.

~120 mL of liquid producing ~5.2 L of CO₂ (120mL is overall liquid. It's not that both reactants are 60mL, they have slightly different volumes - but that I can only share later).

A custom Venturi flowmeter with Arduino/Python data logging, so I have real gas evolution rate and cumulative volume curves to prove the volumetric flow rate. However, the flow rate will also be heavily dependent on the reaction chambers you design.

Company incorporated in Australia, IP assigned in, patent landscape analysis complete, patent strategy underway.

An open co-design and early-customer pathway with Surf Life Saving Australia.

Not done: this is the challenge for you:
Everything between "the chemistry works on a benchtop" and "a manufacturable product on a human arm." Should be a fun and rewarding challenge! The system should be pretty simple - I have designed the chemistry to be perfect for you to just build around it, simply.

We are also interested in incorporating GPS sensors into it, to track athletes who may wear it, or surf life savers. But that's an additional thing and one that we would like to see in the future.

Scope of work:
There will likely be many design cycles and iterations, and we're happy to discuss and be flexible with the budget.

1. The bladder
~5 L inflated, crescent/tube geometry, ~120 mm inflated thickness, shaped to be held against the chest like a rescue tube. Must have a tiny clip on the end of it that's furthest away from the attachment chord (the chord that holds the bladder to the armband after inflation, so it stays with the swimmer) so a rescue can clip the crescent bladder across back onto the rope and tow the victim back to shore.

Must fold and pack down to a fraction of that volume. I would love to explore vacuum-sealed packing.

Must inflate reliably from folded without self-strangling, tangling, or leaving unfilled lobes.

My current lead candidate is metallised foil balloon film: heat-sealable, extremely cheap, and flex-crack isn't a concern because the device is single use. Possibly in a bladder-in-shell architecture with 20–30D ripstop. Please challenge this. I want your materials judgement, not my assumptions repeated back.

Seam design, weld process (heat / RF / ultrasonic), and how that seam survives a panicking adult grabbing the float.

2. Pack, fold and deploy

The fold pattern is probably the hardest single problem here. Airbag, parachute, packraft and inflatable SUP folding logic all apply.

Target: functional buoyancy in under 10 seconds, stretch goal under 5.

Liquid and foam carryover is a known risk. A vigorous liquid–liquid gas reaction foams. I need a trap, baffle or separator so liquid doesn't slug into the bladder or block the outlet. I'd love to hear how you'd approach this.

3. Tether and release
This is a hard functional requirement, not a nice-to-have. A buoyant bladder fixed to the arm lifts the arm forcefully and that's a big issue in surf. We have to release the bladder onto a tether after inflation, so the float ends up in front of the user.

Tether attachment has to take the shock load of a panicking adult grabbing and pulling.

Must not snag, tangle around limbs, or release early during normal swimming, paddling or surfing.
Tether length, swivel and stowage all need designing.

4. Reaction chamber and trigger
Likely needs a clear path to injection moulding at volume. The chambers should be soft - the chemicals are safe and won't affect degradation. I'm thinking something like silicone or whatever material heat shrink is made from. It's flexible, but it's watertight and holds well.

A hermetic seal in storage across a realistic temperature range, like a car boot in a Queensland summer and a Tasmanian winter.

The separator has to hold a perfect seal for years, then release with deliberate force: one hand, cold and numb fingers, possibly without looking.

Open architecture question: one dual chamber, or an array of multiple small parallel reaction chambers? Multiple chambers might buy faster mixing, faster gas evolution and a better fold factor at the cost of complexity. I want your view on this.

5. The wearable
A small, low-profile armband. Comfortable enough that someone wears it all day at the beach and forgets it's there; that's what will make people actually want to wear it.

Stays put during swimming, surfing and paddling without cutting off circulation.

Sizing across a wide range of arm circumferences, including children. A simple way to attach it to the arm. Velcro actually turns out to be a huge challenge... Try putting Velcro around your arm and you'll see. It's a weird challenges but I'm thinking something like those snap-on wristbands could be absolutely amazing. In either case the goal is that it goes on tight, using minimal effort and just one hand.

Outer shell: lightweight, thin and soft; crushed neoprene is something I've been considering. Saltwater, UV and abrasion resistant.

The surface needs to be customisable and printable. Club colours, school branding, corporate and event runs are a core commercial channel. Let's make it so we can make it look cool and pretty.

6. Manufacturability and scaling — the thing I care about most

Every decision gets judged against this. This is not a boutique product.

Minimal part count, minimal process steps, minimal exotic materials.

Cheap tooling that's easy to duplicate.

An honest scaling path from 10 units → 1,000 → 100,000, including where processes change and what that costs.

Assembly and fill process design, including how you load two liquids into a sealed device repeatably and safely at volume.

Single-use disposal: minimal material, minimal waste, ideally recyclable or benign. The spent chemistry is food-grade adjacent and I'd like the product to match that.

Targets
These are my current theatrically achievable numbers.

Inflated volume:
~5 L (≈50 N buoyancy, comparable to an ISO 12402 Level 50 buoyancy aid)
Liquid payload
~120 mL total, two liquids
Gas generated
~5.2 L CO₂
Time to functional buoyancy
Less than 10 s (stretch: 5 s)
Total worn mass
Less than 300 g (stretch: less than 250 g)
Packed envelope
~270 × 75 × 35 mm or better
Operating water temperature
5–50 °C
Activation
One hand, no visual, works with numb fingers
Book of materials at volume (100k units)
Aggressively low, happy to discuss specifics once we're talking

Another target is the incorporation of a GPS system into these so people can track where lifesavers are, if lifesavers wear them, or people can use it for tracking of exercise.

Skills I'm looking for (but it's ok if you don't have all of them! I'm a strong believer that you can learn anything with enough time and effort):
Hands-on inflatable or soft goods engineering. Life jackets, drysuits, inflatable SUPs, medical inflatables, evacuation slides, airbags. Or just any kind of wearables; I want this to be as sleek and cool as a watch so if you've got experience with designing wearables, this could be good for you.

Design for manufacture. Real experience taking a physical product from prototype to tooled, volume production, and support of a startup that's a social venture.

Textile and materials engineering: film and laminate selection, coated fabrics, seam and weld engineering, saltwater/UV durability, cost engineering.

Mechanical and product design; the reaction chamber, separator mechanism, trigger ergonomics, tether release.

Wearables and industrial design; armband ergonomics, sizing, aesthetics, the customisation surface.

Automotive airbag or gas generator background.

Water sports or marine background; do you like the beach? Do you like swimming? Have you ever been affected by drowning?

Logistics:
Milestone-based. I'd rather start with one small, well-scoped first milestone and expand from there than sign a large scope cold. Both of us get to find out how we work together on something low-risk.

Remote. I'm in Australia; some overlap with AEST helps but isn't essential. I'm a night owl. Physical prototyping can be coordinated with shipped samples or hosted here.

Long-term potential. This is a multi-stage product development programme, not a one-off task. For the right long-term collaborators, equity options alongside cash may be available. In case you're interested in equity options, I will quickly add: our revenue if we can achieve our vision, by 2031, is likely to be more than $20M.

Budget and timeline: We are looking at less than $8,000 and a minimum viable product in 3-6 months, if not faster.

An NDA and IP assignment will be part of the contract, but nothing is needed to have a first conversation.

How to apply:
Keep it easy. I'd much rather just have a chat and learn how you work, what ideas you have, and what you can bring to our team!

If you're a mechatronics, mechanical, design, wearable or soft goods engineer, reach out!

One last thing:

Most engineering work makes something slightly faster or slightly cheaper. This one has a body count attached to the outcome.

Every year, hundreds of thousands of people worldwide die with nothing that could have saved them. And it's because lifejackets aren't sleek; they are bulky, look silly and can actually be an issue on the beach when it comes to diving under waves.

If we get this right, the thing you helped design ends up on arms at every beach, pool, river and lake, worn without a second thought, the way a helmet is. That's the job. I'd love your help building it.

HubSpot Presales Solutions Architect

Location: Remote - Open globally
Hours: Monday–Friday, 8:00 AM–5:00 PM U.S. Eastern Time
Engagement: Full-time independent contractor
Compensation: $3,000 USD per month
Language: Fluent English required

Application deadline: Thursday, August 13, 2026, at 5:00 PM U.S. Eastern Time

About the Role
We’re looking for an experienced, HubSpot-focused Presales Solutions Architect to join our team at the intersection of sales, technology, and client strategy.

You’ll play a critical role in helping prospective clients understand what’s possible with HubSpot. From leading technical discovery and designing tailored solutions to validating project scope and supporting implementation handoffs, you’ll help us win the right business and set every new client up for success.

This role is ideal for someone who combines strong HubSpot expertise with commercial awareness, confident communication, and a practical understanding of how solutions are implemented.

Key Responsibilities
-Lead prospect discovery calls and technical sales conversations
-Design and present tailored HubSpot solutions and demonstrations
-Recommend the appropriate HubSpot hubs, tiers, and services
Translate business requirements into accurate scopes and estimates
-Review proposals and statements of work for technical accuracy and feasibility
-Identify risks and challenge assumptions before commitments are made
-Coordinate a clear, well-documented handoff from sales to delivery
-Support technical planning during the early stages of client onboarding

What You Bring

-Proven experience in HubSpot presales, solutions architecture, or senior consulting
-Strong knowledge of CRM, Marketing Hub, Sales Hub, Service Hub, and Operations Hub
-Experience leading discovery, demonstrations, and solution presentations
-Strong project-scoping and estimation skills
-The ability to explain complex solutions in clear business terms
-Confidence communicating with senior stakeholders
-Excellent written and spoken English
-Availability during U.S. Eastern Time business hours
-HubSpot certifications are strongly preferred

What Success Looks Like

Prospects understand and trust the recommended solution, project scopes are accurate and deliverable, and the delivery team receives everything needed for a successful implementation.

How to Apply

Please submit a concise proposal that includes:
A summary of your HubSpot presales or solutions architecture experience
The HubSpot hubs and subscription tiers you’ve worked with
An example of a complex HubSpot solution you scoped or designed
Your experience conducting discovery calls and product demonstrations
Your current HubSpot certifications
Confirmation that you can work Monday–Friday, 8:00 AM–5:00 PM U.S. Eastern Time
A short video introduction or relevant work sample, if available
Please begin your application with the words “HubSpot Architect” so we know you’ve read the full description.
Applications close on Thursday, August 13, 2026, at 5:00 PM U.S. Eastern Time. Shortlisted candidates will be contacted after the deadline.