Senior Technical Lead / Full Stack Engineer

About the role

Gapstars partners with ambitious European companies, from tech startups to accounting firms, building engineering and finance teams. It is looking for an experienced full stack engineer to take independent ownership of complex features across its products, strengthening web applications, backend services and cloud operations, and helping deliver a mobile application planned for release in 2027. This is a hands-on senior engineering role with strong production GCP experience, practical Kubernetes knowledge, DevOps exposure and mobile development experience.

Key responsibilities

• Full stack development: own work from technical design through implementation, testing, deployment and production follow-up, using TypeScript, React, Next.js and Node.js
• Extend an existing codebase safely, turn incomplete requirements into testable acceptance criteria, and review code and document decisions
• Design PostgreSQL schemas, migrations and queries with an ORM such as Prisma
• Deploy, operate and troubleshoot production workloads on GCP (Cloud Run, Cloud SQL, Cloud Build, IAM, networking, secrets, logging and monitoring)
• Work with Docker and Kubernetes, maintain CI/CD pipelines and improve observability and incident response
• Contribute to the COSMOS mobile app, including secure authentication, API integration and local storage, and own release activities from build configuration to store submission and post-launch monitoring
• Use AI coding assistants regularly, independently reviewing and validating generated code
• Own quality through unit, integration and end-to-end tests, and keep technical documentation up to date

Required profile

• 8+ years of professional software engineering experience, including full stack development and independent ownership of complex production features
• Personal responsibility for at least one successful Apple App Store release, explaining their own role in signing, submission and review feedback
• Regular use of AI-assisted development tools with concrete examples of directing and correcting generated work
• Strong debugging, automated testing, security awareness, communication and independent delivery skills

Required skills

• TypeScript, React, Next.js, Node.js and relational databases
• Production GCP experience and hands-on Kubernetes
• Docker, CI/CD and DevOps
• Mobile development with a production framework and release management
• Preferred: React Native, Google Play publishing, GKE, IaC, Playwright/Jest/Vitest, background processing, LLM API integration, Rust or GoLang