Full stack-ontwikkelaar

About the CompanyOur client is a fast-growing HealthTech scale-up building technology that makes healthcare more accessible, efficient and scalable. Their platform already serves thousands of users and continues to grow rapidly.As they continue to scale, they're rebuilding the foundation of their platform to support future growth. This creates a unique opportunity for an experienced engineer who enjoys solving complex technical challenges and building high-quality software from scratch.Engineering plays a central role within the organisation. You'll join a highly technical team where ownership, collaboration and continuous improvement are key. Decisions are made quickly, new ideas are encouraged and modern AI-powered development practices are part of the daily workflow.The RoleThis is a hands-on role for a Senior Full Stack Engineer who enjoys building products from the ground up.You'll design and develop the core backend, APIs and data models that form the foundation of the platform. From architecture and implementation to deployment and optimisation, you'll take ownership of the complete software lifecycle.A key part of the role is improving engineering productivity through AI. They're looking for someone who has experience building AI agents, custom workflows, plugins or internal tooling, not just using AI coding assistants.What You'll DoDesign and build scalable backend services using Node.js & TypeScriptDevelop APIs for web and mobile applicationsDesign databases and scalable data modelsOwn features from architecture through productionBuild integrations with external platforms and APIsImprove engineering workflows through AI agents and automationHelp shape the technical direction of a fast-growing platformTech StackTypeScriptNode.jsReact & React NativeSQL & NoSQLREST APIsDockerAWS / Azure / GCPCI/CDAI coding tools (Cursor, Claude Code, Codex and similar)What We're Looking ForRequired4+ years of software engineering experienceStrong backend expertise (Node.js/TypeScript preferred)Experience designing scalable APIs and databasesProven experience building and deploying products end-to-endHands-on experience with AI agents, autonomous coding workflows or custom AI toolingStrong ownership mindset and excellent communication skillsFluent in EnglishNice to HaveReact and/or React NativePythonCloud infrastructure & DockerCI/CD experienceIAM / RBACExperience with regulated environments such as Healthcare or FinTechWhat's On Offer€7,000 – €10,000 gross per monthPension schemeLearning budgetPersonal benefits budgetHybrid working (2 days in the Rotterdam office)Flexible remote workingModern engineering culture with plenty of ownershipThe opportunity to build a greenfield platform using the latest AI-driven development practicesInterested in this opportunity or curious whether it's the right fit for you?Feel free to apply through this vacancy or reach out directly for a confidential conversation.📧 g.vanschagen@haystackpeople.nl