**About us** We’re building a data platform. Our product is deeply data\-driven, with a strong focus on performance, reliability, and long\-term maintainability. We are actively looking for a Full\-Stack Developer (Next.js/TypeScript, backend\-heavy, 3\+ years of experience) to join us on a long\-term basis and help strengthen and scale our backend and platform as we grow. We are a fully remote team, with team members based in Europe and South Africa, and we value autonomy, ownership, and clear communication. **Role Description** This is a remote freelance contract role for a full\-stack developer with a strong backend focus. You will be responsible for designing, hardening, and maintaining efficient and reliable server\-side applications and systems, as well as working within our Next.js app where needed. **You will:** → Add test coverage \+ CI/CD pipeline → Fix database issues (race conditions, connection pooling, query optimization) → Implement performance fixes (pagination, caching) → Review architecture for scale → Set up monitoring \& structured logging → Secure \& optimize API routes (validation, rate limiting, error handling) → Improve background jobs \& webhooks reliability (Inngest) → Harden authentication \& authorization flows (Clerk \+ Next.js middleware, RBAC, secure sessions) → Optimize Supabase/PostgreSQL \& ClickHouse queries and data model for high\-volume data (Billions of raws) → Ensure secure, robust usage of Next.js 15 Server Actions \& API routes **Tech Stack** \- Next.js 15 (API Routes, Server Actions, React) \- PostgreSQL \+ Supabase \+ ClickHouse \- Vercel, Inngest, Clerk \- TypeScript **Must have** \- 4–5\+ years Node.js/TypeScript backend experience \- 2–3\+ years building production systems with Next.js \- Strong PostgreSQL experience (transactions, performance, indexing, connection pooling) \- REST API design \& security (auth, input validation, rate limiting) \- Testing (unit \+ integration) and CI setup experience \- Database architecture \& schema design \- Experience stabilizing and refactoring existing codebases, not just greenfield \- Comfortable working across backend and the Next.js app layer **Nice to have** \- Experience with Clerk or similar auth providers \- Experience with Supabase \- Experience with ClickHouse or other OLAP databases \- Experience with Vercel and serverless deployments \- Experience with background jobs \& webhooks orchestration (Inngest or similar) \- Previous work on data\-heavy SaaS or analytics platforms Budget: $1,000–$2,000/month Type: Long\-term freelance (no agencies) Availability: Full\-time Start: ASAP Location: Europe / South Africa Job Type: Contract Contract length: 12 months Pay: 1,000\.00€ \- 2,000\.00€ per month Application Question(s): * Link your GitHub profile * Largest production database managed (rows/GB)? Name 2 specific optimizations you implemented to maintain performance at that scale * Describe a similar MVP\-to\-Production experience, what specific steps did you take to harden the system and what was the outcome? * Which AI tools/models do you use daily to speed up development? How do you use it ?