We are a medically backed, pre-seed healthtech platform preparing for an immediate enterprise pilot deployment. Our core user interface, interactive data features, and content architecture are functionally built utilizing modern AI-assisted development tools. We are seeking a senior, hands-on engineer with specific healthtech deployment experience to serve as our Execution Contractor for an immediate hardening sprint. You will own the backend security architecture, external cloud infrastructure configuration, and technical compliance validation required to transition our high-fidelity MVP into a secure production environment. What You’ll Do Harden Backend Security: Transition frontend route guards into strict, server-side authentication and authorization boundaries across all data-access paths. Architect Secure Infrastructure: Migrate core data architectures out of staging environments and securely provision an external, HIPAA-compliant cloud database tier. Manage Vendor & Compliance Workflows: Audit our technical vendor stack to securely embed enterprise API protocols, ensuring strict data handling and compliance alignment across all integrated platforms. Validate & Sign-Off: Run edge-case testing and performance audits to completely secure data handling pipelines, delivering a technical go/no-go sign-off for our upcoming pilot cohort. The Technical Stack Frontend: React 18+, TypeScript Backend: Node.js, Express.js Database/ORM: PostgreSQL via Drizzle ORM Environment/Tooling: WebSockets, Enterprise AI APIs, Secure Cloud Infrastructure (AWS / Supabase) Who You Are A seasoned full-stack or backend engineer with a proven track record of successfully deploying applications into live clinical, medical, or heavily regulated environments. Deeply knowledgeable in server-side encryption, data pseudonymization, and secure cloud networking. Highly comfortable inheriting, auditing, and optimizing architectures built alongside AI-assisted development workflows. An execution-focused builder who thrives in high-velocity sprints and values absolute production discipline. To Apply: Please submit your proposal directly through Upwork with a brief summary of your healthtech deployment experience, specifically highlighting your experience with secure data pipelines, PostgreSQL, and HIPAA configurations.

**React Native Expo Developer Needed to Finalize and Deploy Mobile App** We have a mobile app that is nearly ready for launch, and we are looking for an experienced React Native Expo developer to help close out the final development items, test the app, and deploy it to both the Apple App Store and Google Play Store. The app is built with **React Native Expo**, **Appwrite BaaS**, and **Firebase push notifications**. **Scope of Work** We need help with the following: 1. **Final testing and implementation support for key features** * Push notifications using Firebase * OAuth2 login and sign-up flow * Address autocomplete using the Google Places / Google Maps API 2. **Mobile app testing, verification, and validation** * Test the app on both iOS and Android * Identify and fix bugs or deployment blockers * Verify that authentication, notifications, and location/address features work correctly * Ensure the app is stable and ready for production release 3. **App Store and Play Store deployment** * Prepare the app for production builds * Help configure required store settings * Submit the app to the Apple App Store and Google Play Store * Resolve any issues that come up during the submission or review process **Ideal Candidate** The ideal candidate should have experience with: * React Native and Expo * Appwrite backend services * Firebase Cloud Messaging / push notifications * OAuth2 authentication flows * Google Places or Google Maps APIs * iOS and Android deployment * Apple Developer Console and Google Play Console * Debugging production build issues We are looking for someone who can move efficiently, communicate clearly, and help us get the app fully launched.

We are seeking an innovative and user-focused Front-End Developer to play a pivotal role in the development of modern web applications designed to enhance collaboration, automate essential business processes, and streamline daily operations across the organization. Your expertise will be instrumental in crafting responsive, high-performance user interfaces that empower employees, customers, and business partners to interact seamlessly and efficiently with our digital platforms. As a Front-End Developer, your primary responsibility will be to design and implement feature-rich web applications that serve a variety of functions, including customer self-service portals, internal collaboration systems, workflow automation tools, document management platforms, approval processes, scheduling systems, and a range of business productivity solutions. To achieve this, you will focus on delivering intuitive user experiences that aim to reduce complexity, enhance accessibility, and promote user adoption across multiple business functions. Furthermore, this position is ideally suited for developers who possess a passion for creating polished and engaging user experiences while tackling complex workflow challenges through the use of modern front-end technologies. You will have the opportunity to stay on the cutting edge of industry trends, leveraging frameworks and tools that promote best practices in web development. Your contributions will not only enhance the functionality of our systems but also create a lasting impact on how our organization operates and interacts with its stakeholders. Required Skills and Qualifications: - Extensive experience with modern frontend frameworks such as React, Vue.js, Angular, or similar. - Proficiency in JavaScript (ES6+), TypeScript, HTML5, and CSS3. - Experience in building responsive and accessible web applications. - Strong understanding of REST APIs and asynchronous data handling. - Familiarity with Git and collaborative development workflows. - Knowledge of front-end build tools and package managers. - Strong skills in debugging, troubleshooting, and performance optimization. - Excellent communication, collaboration, and problem-solving abilities.

We’re seeking a Full Stack Engineer (mid- to senior-level) with strong expertise in Node, React, and TypeScript to design, build, and maintain the APIs, workflows, and interfaces that power the Probada platform. This is a hands-on, end-to-end role that blends backend logic, data-driven workflows, and modern, component-based frontend development. You’ll work directly with our Lead Developer and CEO to ship features that have immediate, meaningful impact in classrooms and communities. Key Responsibilities Design, implement, and maintain backend APIs and workflows using Node and TypeScript Build responsive, maintainable user interfaces in React following component-driven best practices Integrate frontend and backend components into cohesive, scalable systems Collaborate closely with designers, product managers, and engineers to deliver high-quality features Optimize platform performance, reliability, and maintainability Participate in code reviews, testing, and CI/CD processes Requirements 3+ years of professional full-stack development experience Strong proficiency in Node, React, and TypeScript Solid understanding of component-driven architecture and modular design Familiarity with Git workflows, Agile development, and CI/CD pipelines Excellent problem-solving, debugging, and communication skills Additional Preferences Experience with MongoDB, Parse Server, GraphQL, Docker, Jest, Material UI, IntelliJ IDEA, or Jira Interest or experience in edtech, workforce development, or scalable SaaS platforms

We are looking for a Senior Software Developer with excellent technical skills and outstanding interview abilities. The ideal candidate should be able to communicate clearly, think through problems in real time, and perform exceptionally well in technical discussions, coding interviews, and system design sessions. Requirements - 8+ years of professional software development experience - Strong expertise in one or more technologies such as Python, Node.js, Java, .NET, React, or similar - Solid understanding of system design, APIs, databases, cloud platforms, and distributed systems - Excellent problem-solving and analytical skills - Exceptional verbal and written English communication - Ability to explain technical concepts clearly and confidently - Strong performance in live coding, debugging, and system design interviews - Professional attitude and ability to think under pressure Responsibilities - Design, develop, and maintain scalable software solutions - Collaborate with engineering and product teams - Participate in architecture discussions and technical decision-making - Write clean, maintainable, and high-quality code - Mentor team members and contribute to best engineering practices Ideal Candidate - Performs exceptionally well in technical interviews and coding assessments. - Communicates ideas clearly and confidently. - Can discuss past projects in depth and explain technical decisions. - Demonstrates strong ownership and leadership qualities.

I have an existing website built with React and Sanity CMS that needs updates. The ideal candidate will have experience in both React and Sanity CMS, and be able to make necessary updates to the website. This project involves maintenance and possibly feature enhancements to ensure the website remains functional and user-friendly.

We're a fast-moving company with a strong in-house backend team looking to add a dedicated frontend developer on a retainer basis. This is not a one-off gig, we need someone available, responsive, and able to execute quickly when projects move. We're expanding our dev capacity and want to bring on someone who is hands-on, communicative, and fully present on every project they take on. Direct collaboration with our internal team is essential, we move fast and need someone who moves with us. WHAT YOU'LL BE DOING: Working directly alongside our in-house backend developers, design team, and marketing team to build and maintain web interfaces, implement designs, and ship features quickly. You'll own the frontend layer completely. WHAT WE NEED YOU TO KNOW COLD: - Tailwind CSS — this is non-negotiable, it's our primary styling approach - React and TypeScript — you should be writing this daily - Laravel — familiarity required, it's a core part of our backend stack - Astro — familiarity expected, you'll encounter it in our stack - Clean, responsive UI implementation with an eye for detail WHAT WE'RE LOOKING FOR: - Someone who writes their own code and takes full ownership of their work - Strong availability during US business hours - Fast turnaround without cutting corners - Clear, proactive communication throughout every project TO APPLY, PLEASE INCLUDE: - Your portfolio or GitHub link - 2–3 examples of projects built with Tailwind + React - A short note on your availability and how you handle tight deadlines

🚀 Freelance Full Stack Developer Wanted for A Mobile APP MVP  We’re looking for a medical app developer to develop a mobile app MVP. We're looking for a skilled Full Stack Developer to bring our product vision to life. This is a freelance opportunity, perfect for someone who knows how to deliver an MVP that’s functional and launch ready.   Must be US based.  🗓️ Target MVP Launch:  ---🔧 What You’ll Do: · Design and develop the front-end (mobile-first) and back-end of our MVP from scratch.  · Collaborate closely with the founders to translate product ideas into functional features.  · Build a clean, responsive, and user-friendly mobile UI.  · Set up secure user authentication, data storage, and scalable APIs.  · Deploy and maintain the MVP in a cloud environment.  --- 🛠️ Tech Stack We’re Looking For: We're flexible — but preference will be given to developers experienced with: · Frontend: React Native or Flutter  · Backend: Node.js, Express (or Python/Django if that's your strength)  · Database: Firebase, PostgreSQL, or MongoDB  · Cloud: Firebase, AWS, or other serverless platforms  · Platform(s): iOS, Android, both, (including web + mobile a plus) · Key Features: user registration, data capture (including pictures), analytics dashboard, HIPAA compliance, push notifications).  · Health/Security/Regulation: we need developers experienced with health-app regulations (HIPAA, GDPR, etc.), data security and privacy.  · Deliverables & Timeline: Will provide milestones.  · Team vs Individual: Single freelance developer or a small team preferably (designer + backend + mobile).  · Experience / Portfolio Requirements: Please provide examples of prior health apps or mobile apps you’ve built.  · Communication & Location: Time Zone is ET. • The signing of the organization NDA is REQUIRED before any discussion or engagement.

we are a consumer health app that reads your Apple Watch data every morning — HRV, sleep quality, steps, active energy — and delivers a spoken, AI-generated daily plan. Built on React Native, Supabase, and Anthropic's Claude AI. We are looking for a contract React Native developer to build V1 from specification to TestFlight. The product is fully designed, the tech stack is chosen, the legal entities are formed, and seed funding is in place. This is a build-it role, not a discovery role. What you're walking into: A founder with a complete product specification, a defined tech stack, milestone-based payment, a signed contractor agreement (NDA + IP assignment), and a clear 90- day path to TestFlight beta with real users. You will need At least one live app in the App Store built with React Native — link required in application ✦ Demonstrable experience with Apple HealthKit — must have integrated at least one HealthKit data type in a shipped app ✦ Backend integration experience — Supabase, Firebase, or comparable cloud backend with auth and real-time data ✦ Third-party API integration — REST APIs with OAuth or API key authentication ✦ Willingness to sign a standard contractor NDA and IP assignment agreement before engagement begins

Summary I'm building Artcade, a patent-pending peer-judged creative skill-gaming platform where people compete in drawing, photo, and writing contests, in 31-player cohorts, for real-money prizes. The mission is simple: incentivize imagination. The whole experience is generally built with AI prototyping. React/TypeScript, every screen from game selection through voting, results, wallet, and compliance. It was built fast and AI-native, and it's production-ish quality. Now I need a founding-level frontend/mobile engineer to help us on the last mile: convert it to a React Native iOS app and get a real build into TestFlight. That's the one thing that matters first. If you've shipped real mobile apps, you obsess over how a touch interface feels, and you're comfortable blending AI dev tools with strong engineering fundamentals, this role is for you. What You'll Do - Convert our React/TypeScript prototype into a React Native iOS app and get it live on TestFlight (the #1 priority. It unblocks everything downstream) - Stand up and manage TestFlight builds through a paced, compliance-gated cadence (build → cert gate → adjust → continue) - Own the drawing canvas end-to-end — multi-tool, touch optimization, responsiveness, performance. It's our signature surface and it has to feel great - Build the core game and voting flows (cohort fill, submission, the gated 5×6 → 5 → 1 voting flow, results) plus wallet, profile, progression, and responsible-gaming screens - Bring a real point of view on animation, transitions, and game feel — not just ship tickets - Use AI dev tools (Claude Code, Codex, similar) to move fast, and help systematize what works - Collaborate directly on product direction — this is a founding seat, not a ticket queue Ideal Candidate Experience - React Native Engineer (5+ years) with shipped mobile apps. - Real apps live on TestFlight / the App Store — React Native and/or native iOS (Swift/SwiftUI), not web-with-a-responsive-layout. - Strong React / TypeScript experience helpful. - UX craft on interactive, canvas, or touch-heavy surfaces. Mobile Expertise - React Native (Expo / bare workflow) and the iOS build + TestFlight pipeline - Touch handling, gesture systems, and 60fps performance on device - Animation depth — Framer Motion, Reanimated, or SwiftUI animation Craft & Canvas - Canvas / graphics / drawing-tool experience (Canvas API, WebGL, custom rendering) - A portfolio piece that's interactive and feels good to use — show us something you made - An eye for game feel, transitions, and micro-interactions AI-Native Builder Profile (Must-Have Mindset) - You've recently vibe-coded and are comfortable with AI dev tools like Claude Code, Codex, Droid - You blend AI output with your own logic and refactors — fluent, not dependent - You think of AI as a collaborator that lets a small team ship like a big one - You love testing new workflows and systematizing what actually works Highly Valuable - Mobile game experience — especially drawing / creative tools / rich touch interaction - Skill gaming, iGaming, or real-money gaming background (Skillz, Big Run, PrizePicks, etc.) - Real-time UX (WebSocket waiting rooms, live game state) - Design-fluent enough to pair tightly with a brand designer Soft Skills & Mindset - Operates like a founder — autonomous, pragmatic, fast - Runs from a prototype and a POV, doesn't wait for pixel-perfect specs - Communicates clearly and async-friendly - Comfortable with a paced, gated start-stop rhythm (the cert cadence is part of the job) - Cares how things feel, not just whether they work What You'll Get - A founding frontend seat on a product that's already built and ready to ship - Direct collaboration with the CTO on architecture and the CEO on product - 1099 contract-to-hire to start, converting to a full-time early-employee seat with equity on mutual fit - Real ownership of the surface users touch most — the draw tool is yours - The chance to define how an entire creative-gaming product feels on mobile Our Mission - We're building creative skill gaming that rewards imagination with real prizes. - The product is built. The job is to make it real on mobile, and make it feel incredible. - If you've shipped mobile apps you're proud of, you sweat the details of touch and motion, and you want to own a signature surface from day one, you'll fit right in. Note - This is U.S.-based and work-authorized (1099 → W-2 path). Rate is $50-70/hr depending on experience, negotiable up for strong mobile-game or drawing-tool backgrounds. We'll start with a short paid sprint on the actual codebase to align on pace and quality, then scale from there. Looking forward to building together.