Senior Full-Stack Developer (React / Supabase / TypeScript)

Genix Solutions is seeking a Senior Full-Stack Developer for a UK-based B2B SaaS platform. The role involves refactoring and hardening an existing multi-module platform from AI-prototyped code to production-grade standards, focusing on code quality, architecture, and operational reliability.

• Phase 1: Conduct full codebase audit with written proposal and prioritised recommendations
• Phase 2: Systematically refactor frontend architecture, Edge Functions, RLS policies, Stripe integration, and optimize performance
• Phase 3: Implement test coverage for critical paths, set up CI/CD pipeline, establish staging and production environments, and create technical documentation
• Refactor React components and TypeScript architecture patterns
• Harden Supabase configuration including RLS policies and Deno Edge Functions
• Manage Stripe billing integrations including subscriptions, webhooks, and metered billing
• Orchestrate external LLM API calls through Edge Functions

• Proven experience refactoring AI-generated or rapidly prototyped React + Supabase codebases to production grade (mandatory)
• Strong expertise in React 18, TypeScript, and component architecture patterns
• Deep hands-on knowledge of Supabase: RLS policies, Deno Edge Functions, Auth, and Realtime
• Experience with Stripe billing integrations (subscriptions, webhooks, lifecycle events)
• Familiarity with Vite, shadcn/ui, Tailwind CSS, and React Router
• Experience setting up CI/CD with GitHub Actions and modern deployment platforms (Vercel or similar)
• English language proficiency B2+ for client communication

This is an hourly, project-based engagement structured in three sequential phases. Phase 1 is a standalone paid deliverable with client sign-off required before proceeding to Phases 2 and 3. Deployment involves migration from Lovable Cloud to Vercel or similar platform.