Senior Full-Stack Developer (Next.js)

Role overview Build and maintain customer-facing subscription product features across a TypeScript application, from initial requirements through production release and follow-up. You’ll work across a Next.js client and a Node.js backend, taking ownership of code quality, reliability, security, and the performance of the areas you change.

Responsibilities - Develop features across a Next.js App Router client and a Fastify or similar backend connected to PostgreSQL and a headless CMS. - Follow established code organization, naming, and import conventions. - Release changes behind feature flags and experiments, with localization across supported languages. - Integrate billing, email, customer relationship management, and analytics services through REST APIs and webhooks. - Write unit, integration, and end-to-end tests; review your work and teammates’ code. - Investigate recurring defects, improve page and API performance, and apply secure validation, access control, and secret-handling practices. - Add structured logs, metrics, and alerts; plan, estimate, deliver, and monitor work within a sprint.

Requirements - At least 2 years of commercial React experience, including 1 year with Next.js App Router, Server Components, route handlers, and rendering or caching strategies; strong TypeScript skills. - Node.js backend experience with a typed HTTP framework and PostgreSQL, including REST API design, migrations, and webhook security and reliability. - Familiarity with client tools such as TanStack Query, Zustand, React Hook Form, Zod, Tailwind CSS, and a React component library. - Experience with a code-first headless CMS backed by PostgreSQL, including access controls, generated types, and migrations. - Testing and delivery experience with end-to-end and unit or integration frameworks, Git, code review, and CI. - Daily use of AI development tools, with responsibility for checking generated code for correctness and security. - English proficiency at B1 level or higher; clear written communication and sound judgment about when to escalate technical decisions.

Benefits and work setup Remote work is available to applicants located within approximately four hours of Central European Time. The package includes unlimited paid time off, paid national holidays, and a company-provided MacBook where needed. The engagement uses a flexible independent-contractor agreement.