Freelance Developer & Solution Partner for WebApp Projects (React/Vite · TS · Node · Supabase)

Senior Freelance Developer & Solution Partner — App Projects (React/Vite · TypeScript · Node · Supabase) About us We're an established German marketing & communications agency. Alongside our core work, we build small-to-mid web applications and internal tools for our clients. We are talking Configurators, Sales Apps, Client Portals. We either are tasked to replace an subscription software with a custom webapp. Or we are tasked to build an individual solution that does not exist in the market. We're expanding our delivery capacity and looking for a senior freelance developer who doesn't just write code, but helps shape the right solution - working from goals and requirements, not purely from finished detailed specs. The goal is a long-term, dependable collaboration, not a one-off. What you'll do - Take a business goal and a set of requirements from us, and help shape the right solution: propose the approach, scope, and a realistic plan, with clear recommendations and tradeoffs - Turn that into a working technical plan and acceptance criteria together with us: we don't have to hand you finished detailed specs; we bring the goal, the client context, and what "done" means, you bring the technical answer - Build production web apps end-to-end: from plan to running, deployable software - Use modern AI-assisted workflows (Claude Code, partly Lovable) where they genuinely speed up delivery without sacrificing code quality, security, or maintainability - Hand off clean, documented, maintainable code How we work (read this carefully — it's the core of the role) - We own the business goal, the client relationship, and the definition of success. - You own turning that into the technical solution, the plan, and the build. - We expect you to ask the right questions, recommend the appropriate solution, and push back when a requirement is unclear or scope is drifting — not to silently build whatever is stated. - Spec-light, not spec-free: we bring goals and acceptance criteria; you co-create the technical plan. - We start with one paid trial project so we both see how the collaboration works in practice and then scale into ongoing work if it's a fit. Our stack - Frontend: React + Vite, TypeScript - Backend: Node, Supabase (Postgres, Auth, Row Level Security, Edge Functions) - Hosting: Vercel (preferred) or Lovable Cloud (partly) - Tooling: GitHub, Claude Code, partly Lovable - We're pragmatic about tooling — if you'd build something differently, tell us why. You're a strong fit if you - Are genuinely senior: you've shipped multiple real web apps end-to-end and shaped the solution, not just executed someone else's blueprint - Can take a rough goal and come back with a clear, justified plan and recommendation - Are strong in TypeScript, React/Vite, Node and Supabase — including Auth and Row Level Security, not just basic CRUD - Use AI coding tools fluently and know exactly where they produce fragile or insecure output — and fix it - Work cleanly with Git: pull requests, sensible commits, clear branching - Communicate and advise clearly in English, work async, and have reasonable EU time overlap Nice to have - Experience handing projects over to other teams (documentation, environment setup, maintainability) - Design sensibility for clean, usable UIs - German language skills How to apply Applications missing any of the following will be skipped: 1. 2–3 web apps you personally built; live URLs, your specific role, and one line on where you shaped the solution vs. just executed a given spec 2. A link to your GitHub or representative code samples 3. Your availability (hours/week) and your hourly rate (EUR or USD) 4. Start your message with the word "Effect" so we know you actually read to the end We read every application that follows these steps. We're looking forward to seeing your work.