Senior Fullstack Engineer

**Senior Fullstack Engineer (Node.js / NestJS / Next.js)** Amsterdam Hybrid Full-time **About Creative Clicks** Creative Clicks is a high-growth performance marketing company building and scaling data-driven digital products globally. We operate across 65+ countries, combining the speed of a startup with the scale of an international organisation. Our engineering team builds the platforms and services that power our mobile apps, internal tools, and product infrastructure. **About the role** We're looking for a senior product engineer first — someone who picks up a feature, designs it end-to-end, writes the code, and ships it to production with tests that catch real regressions. You'll work across our Next.js front-end and NestJS back-end, collaborating closely with Product, Design, Mobile, and BI. This is a hands-on role for someone who likes to own things from idea to production and who uses modern AI coding tools as a natural part of their workflow. **What you'll do** * Build and maintain scalable backend services using Node.js, NestJS, TypeScript, Prisma, and PostgreSQL * Develop clean, performant frontend applications using Next.js (App Router, RSC) and React * Design and optimise APIs consumed by mobile apps (Flutter) and internal tools * Own database design, migrations, indexing, and performance optimisation across a large Prisma schema * Implement secure authentication and authorisation flows (JWT, OAuth) with GDPR awareness * Write high-quality, testable code — unit, integration, and E2E tests that catch real regressions, not coverage filler * Deploy and operate services on AWS (EKS, Docker, CI/CD, Helm) * Write clear technical documentation: RFCs when proposing changes, postmortems when regressions slip through **What you bring** * 3–5 years shipping production full-stack TypeScript; you've led non-trivial features end-to-end * Deep knowledge of Next.js — App Router, React Server Components, React 19 runtime, route handlers, middleware * Deep NestJS + Prisma — controllers, services, guards, interceptors, DTOs with class-validators are second nature * Strong TypeScript — you use the type system to prevent bugs * Solid testing instinct — you write tests that catch real regressions, not coverage theatre * Fluency with modern AI coding tools (Claude Code, Cursor, Copilot, or similar) — you use them daily and can compose AI-generated code into something coherent and maintainable * Experience designing and maintaining REST APIs * Production experience on AWS; familiarity with Docker, Kubernetes (EKS), and CI/CD pipelines * Comfortable in a regulated environment (GDPR, data privacy) — or demonstrably ready to learn * Good written communication: clean RFCs, clear postmortems, no ambiguity ### **What We Offer** Competitive salary Hybrid working model (Amsterdam HQ) 25 vacation days A mission-driven team shaping the future of healthcare A culture of innovation, ownership, and collaboration