I’m looking for an experienced U.S.-based Full Stack React Developer to help build a modern sports platform for high school athletics. The backend and database have already been started in Base44. I need someone who can improve the frontend, clean up the data architecture, and help scale the project. This is a long-term opportunity. Ideally, I’d like someone who can become the lead developer as the project grows.

We are looking for an experienced senior full-stack developer to take over an existing mobile application that is approximately 90% complete. The mobile app is already built, and we now need an experienced developer to bring it across the finish line by fixing bugs, completing the remaining features, optimizing performance, and preparing it for production. In addition to completing the mobile app, we also need help finishing our React web application, so experience with both mobile and web development is required. Required Skills Expert in React Native Expert in React Strong JavaScript/TypeScript experience Experience integrating and maintaining Stripe Experience deploying and managing applications on Heroku Experience working with REST APIs Strong Git/GitHub workflow Experience publishing apps to the Apple App Store and Google Play Experience taking over existing codebases Strong debugging and problem-solving skills Excellent communication skills AI Experience (Required) You must have experience using Claude AI (Anthropic) as part of your development workflow to accelerate debugging, code reviews, refactoring, and feature development. We are looking for a developer who knows how to effectively leverage AI tools to improve productivity while maintaining high-quality code. Responsibilities Review and understand the existing codebase Fix all remaining bugs Complete unfinished features Finish our React web application Optimize performance Complete Stripe integrations Ensure smooth communication between frontend and backend Deploy updates through Heroku Prepare both mobile apps for App Store and Google Play submission What We're Looking For This project is not for a beginner. We need someone who is comfortable stepping into an existing project, understanding another developer's architecture, and delivering a polished, production-ready product. When You Apply, Please Include Links to at least 3 React Native apps you've personally built Links to React web applications you've worked on Your GitHub profile Your hourly rate Your availability over the next 30 days A brief explanation of your experience with Stripe, Heroku, and Claude AI An estimate of how many hours you believe it will take after reviewing the codebase Only apply if you have extensive experience with React Native, React, Stripe, Heroku, and taking over existing projects.

We are seeking a Mid to Senior-level Fullstack Developer (3–5 years of experience) to not only maintain and expand our platform (Next.js frontend + Django backend) but also guide us in fully integrating AI-powered coding assistance across the full stack. The frontend is already set up for AI-assisted editing (e.g. Cursor), and we want to evolve our backend similarly. The ideal candidate will help us transition the entire development environment, so both we and the developer can leverage state-of-the-art AI coding tools. Beyond coding, you’ll act as a mentor, helping us better understand the backend’s architecture and workflows while integrating AI-driven development tools into our process. You’ll have a key role in making our stack both stable and future-ready, with AI-assisted flexibility. The Context Our frontend was recently ported to Next.js in an ad-hoc manner, leaving certain sections in need of refactoring and stabilization. We have committed to keeping our backend in Django to leverage its robust processing capabilities. You will be the point person for bridging these two environments. Key Responsibilities -Maintenance & Stability: Perform routine maintenance and optimization across the full stack. -Bug Fixing: Identify and resolve issues within the existing Next.js frontend and Django backend. -System Reliability: Provide technical support and troubleshooting during system downtime. -Feature Implementation: Build and deploy new features, ensuring seamless integration between the AI pipeline and the user interface. Required Technical Profile -3–5 years of professional fullstack experience. -Frontend: Proficiency in Next.js and React; experience cleaning up/refactoring "messy" or legacy codebases is a plus. -Backend: Strong experience with Django (Python), specifically working with complex data pipelines or API integrations. -Mindset: A pragmatic approach to coding—balancing the need for new features with the necessity of technical debt reduction.

I have a React app (two .jsx files, student-facing and coach-facing) that needs to be set up in a Vite project, connected to Supabase for authentication and data storage, and deployed to Vercel. I have a detailed step-by-step checklist already built. Looking for someone experienced with React, Supabase, and Vercel. Estimated 15–25 hours for the MVP backend. Hourly or project rate welcome.

We are seeking a Mid to Senior-level Fullstack Developer (3–5 years of experience) to not only maintain and expand our platform (Next.js frontend + Django backend) but also guide us in fully integrating AI-powered coding assistance across the full stack. The frontend is already set up for AI-assisted editing (e.g. Cursor), and we want to evolve our backend similarly. The ideal candidate will help us transition the entire development environment, so both we and the developer can leverage state-of-the-art AI coding tools. Beyond coding, you’ll act as a mentor, helping us better understand the backend’s architecture and workflows while integrating AI-driven development tools into our process. You’ll have a key role in making our stack both stable and future-ready, with AI-assisted flexibility. The Context Our frontend was recently ported to Next.js in an ad-hoc manner, leaving certain sections in need of refactoring and stabilization. We have committed to keeping our backend in Django to leverage its robust processing capabilities. You will be the point person for bridging these two environments. Key Responsibilities -Maintenance & Stability: Perform routine maintenance and optimization across the full stack. -Bug Fixing: Identify and resolve issues within the existing Next.js frontend and Django backend. -System Reliability: Provide technical support and troubleshooting during system downtime. -Feature Implementation: Build and deploy new features, ensuring seamless integration between the AI pipeline and the user interface. Required Technical Profile -3–5 years of professional fullstack experience. -Frontend: Proficiency in Next.js and React; experience cleaning up/refactoring "messy" or legacy codebases is a plus. -Backend: Strong experience with Django (Python), specifically working with complex data pipelines or API integrations. -Mindset: A pragmatic approach to coding—balancing the need for new features with the necessity of technical debt reduction.

# Job post — copy/paste into Upwork (or Contra/Fiverr Pro) **Title:** Launch a finished static website on Vercel + add Stripe/Tilopay payments and intake forms (small, well-defined project) **Category:** Web Development · Full Stack **Budget:** Fixed price, per milestone (see below) — please bid per milestone **Experience level:** Intermediate–Expert --- ## Description I have a **fully built and tested** magazine/advertising website for the Costa Rica travel market (TidesRight). The design and all 23 pages are DONE — built from a completed design prototype, verified working (all pages render, popups, search, filtering, and a 4-step advertiser signup wizard). The site is plain HTML/CSS/JavaScript (precompiled React, no build step required) sitting in a private GitHub repository, ready to serve as static files. I am not technical, so I need someone who communicates clearly and can own the plumbing end-to-end. A `DEVELOPER-BRIEF.md` in the repo explains the structure, and the repo also contains the full product specs (ad package pricing, form fields, approval flow). ### Milestone 0 — Go live (small, fast) - Fix/redo the Vercel project so the site serves from the repo's `main` branch (files are already at repo root; a fresh import should work with zero config — the current project got stuck on a bad first import) - Connect my custom domain - Confirm all pages load on desktop + mobile **Deliverable:** the site live on my domain. Est. a few hours. ### Milestone 1 — Real payments + advertiser intake (the core job) The site has an advertiser flow at `advertise.html` → `package.html`: package selection → payment → intake form → "submitted for approval" confirmation. Today the payment step is a demo (no real charge). Make it real, keeping the existing look: - Wire each package to real payments — **Stripe** (or **Tilopay** if we settle to a Costa Rica bank; advise me on the right choice for my situation). Packages: Standard $29/$79/$149 per month, Real Estate $99/$399/$899 per month (annual = 2 months free), plus a one-time SEO add-on from $49 - After successful payment, the advertiser fills the intake form (existing fields); submissions must be **saved** (database or a form service like Tally/Jotform) and **emailed to me** with the payment reference - I approve by replying/clicking; nothing goes live automatically - Failed/abandoned payments must not reach the form step **Deliverable:** I can watch a real test payment land and receive the intake submission. Est. 2–4 days. ### Milestone 2 (optional, later) — Admin dashboard Approval dashboard, auto-publish of approved ads, subscription management. Scope after M1 ships. ## What you get from me - Private GitHub repo access: finished site (`main`), full source + design-spec documents (`source` branch), `DEVELOPER-BRIEF.md` - Vercel account access (this project only), domain registrar access, and fast decisions ## Requirements - Shipped at least one real Stripe (or similar) payment integration — link me an example - Comfortable with static sites / vanilla JS (the site is precompiled React — no framework build needed; do NOT rebuild it) - Plain-English communication with a non-technical owner - Timezone overlap with Americas preferred ## To apply, answer these 3 questions 1. Link to a payment flow you built (live if possible). What did you use — Stripe Checkout, Payment Links, or custom? 2. For Milestone 1, would you recommend Stripe Payment Links + a form service, or a small custom backend? Why, in 3 sentences. 3. Your fixed price and turnaround for Milestone 0 and Milestone 1 separately. **Important:** the design is final. This job is plumbing (hosting, payments, forms, email) — not redesign, not a rebuild. Bids proposing to rebuild the site in another framework will be declined.

Join our NYC-based secondaries advisory firm to build and deploy a marketing site using Next.js and Vercel. We have a complete design system and page designs ready for production. Your role involves developing ~7 responsive pages, integrating a CMS for updates, and ensuring DNS cutover with no downtime, SSL, analytics, and technical SEO. The repository will be owned by us from the start. Please attach the SOW and provide live URLs of sites you've built.

We are a fast-growing telecom / AI-First CPaaS serving sms and voice API's. We are building the first AI-first communications platform (SMS, Voice, RCS, AI agents) designed for speed, simplicity, and real-world business outcomes. We are not looking for a “task completer.” We are looking for a true senior engineer who: thinks in systems moves fast makes decisions independently writes clean, scalable code uses AI tools (Claude, etc.) as a force multiplier ⚠️ Read This First *DO NOT APPLY IF YOU ARE PRETENDING TO BE IN A DIFFERENT COUNTRY. PROOF OF RESIDENCY IS REQUIRED. Most applicants will not be a fit. If you need: detailed tickets hand-holding constant direction This is NOT the role for you. If you are the type of engineer who: sees a problem and solves it end-to-end improves architecture without being asked ships quickly without sacrificing quality You will thrive here. What You’ll Do Build and ship full-stack features across our platform (messaging, voice, AI workflows) Make architectural decisions (not just implement) Improve system performance, reliability, and scalability Work directly with founders (no PM layers) Move from idea → production very quickly What We Expect (Non-Negotiable) 5+ years real full-stack experience (not just titles) Strong backend experience (Node.js / APIs / infra) Strong frontend experience (React or similar) Experience building production systems at scale Ability to work autonomously with minimal direction High ownership mentality Bonus (but highly valuable) Experience with telecom / CPaaS / messaging Experience with AI integrations (LLMs, agents, workflows) Experience optimizing performance at scale Startup experience (especially early-stage or fast growth) How We Work Small, high-output team Very fast iteration cycles No unnecessary meetings High trust, high expectations We use AI tools heavily (Claude, etc.) — you should too What We Care About Most Not your resume. We care about: How you think How you build How fast you execute The quality of your code To Apply Please include: Links to projects you’ve built (real production work) A short explanation of: a system you designed end-to-end a difficult technical decision you made independently Your GitHub Optional (but strong signal): Share how you use AI (Claude, etc.) in your workflow Compensation Competitive (based on experience) Long-term opportunity with a fast-growing, profitable company If you are truly senior, this will feel obvious. If not, this role will be very uncomfortable. **THIS IS A FT, HOURLY ROLE. PROVIDE YOUR REQUESTED HOURLY RATE IN PROPOSAL**

Deploy existing React app to Netlify. 1-2 hour job . I have a complete React web application already built and need help deploying it to Netlify. This is a simple deployment job, no coding required. Whats Needed: Take my existing React app (zip file provided), Push the code to GitHub, Connect GitHub to Netlify, Fix any build errors, Verify the site loads at ascendstocks.com Already done: Netlify account set up , domain ascendstocks.com registered already, all environment variables already configured in Netlify, Supabase database already created and running, Tech stack: React, netlify, Supabase, Clerk Auth, Timeline as soon as possible.

We run operations for a small financial-services firm and our team is buried under a stack of tools that don't talk to each other. We need a custom internal tool: a customer portal our clients and staff log into instead of juggling spreadsheets and half a dozen apps. First-phase scope: - A web application (Next.js or similar) with role-based access for admins, staff, and clients. - A Stripe billing integration that saves a card on file and runs autopay, plus ACH payment support. - A QuickBooks integration for nightly reconciliation so our books stay correct. - Light workflow automation and an API integration layer to wire up a few third-party services and replace a fragile Zapier setup that keeps breaking. - An admin dashboard and a client-facing dashboard that read live from our systems, not last week's export. A later phase may add an AI assistant, a chatbot over our own data, so staff can ask a question and get pointed to the right record. This is an ongoing project and we want a senior developer who can own the architecture end to end. Please share a couple of relevant portals or internal tools you've built.