Full-Stack Developer (TypeScript, Node.js, PostgreSQL), long-term SaaS build

TAP Agency is a Dutch AI automation agency. We build custom platforms and AI agents for small and mid-sized companies in the Netherlands. We are starting a large build for one client: a multi-tenant operations platform for a Dutch service company, with sales, planning, a mobile app for field staff, a customer portal, HR, finance and AI agents. The build runs until mid-2027, followed by more platforms for the same client. We are looking for a full-stack developer with a few years of real product experience who wants to grow with us. Our lead engineer sets the architecture and reviews your work; you build features end to end. What you will do - Build on a PostgreSQL data model with organisations, roles and permissions, and row-level security. - Build features end to end in TypeScript: Next.js or React on the front, Node.js on the back. - Build integrations: Microsoft 365 calendars, export files for payroll and accounting, WhatsApp Business, digital signing. - Help build the mobile app for field staff (React Native or Expo). - Work in two-week sprints with a demo and a test session, with code review by our lead engineer. What we ask - 3+ years of commercial experience, of which at least 2 years with TypeScript, Node.js and PostgreSQL. - At least one product you helped build that runs in production with real users. - Good PostgreSQL: schema design, migrations, writing queries that stay fast. - Experience with authentication and role-based access. - You write tests and you document what you build. - English at B2 level or higher, and daily overlap with Central European Time (at least 09:00 to 14:00 CET). - Full-time availability. Nice to have - Multi-tenant SaaS experience, Supabase, Expo, NestJS. - Experience with GDPR and handling personal data of employees. - Working with AI coding tools such as Claude Code in a disciplined way. What we offer - A full-time (or parttime, but at least 20 hours per week) remote contract for the length of the build, with more work for the same client after that. - A paid test task of one to two days, then two paid weeks of working together before we both decide. - Direct contact with the founders, code review by an experienced lead engineer, and room to grow into more responsibility.