Fullstack Engineer
Summary
Contract (freelance kvk/zzp) fullstack role via Salt Digital Recruitment for a client (Booking.com) in Amsterdam: roughly 70% backend development in Java/Spring Boot and 30% frontend in TypeScript/React, owning services end-to-end from design and testing through deployment, production support and possible on-call.
Salt is currently hiring a Fullstack Engineer for a client of ours in Amsterdam. We require a freelancer with kvk/zzp.
Tech Stack
- Backend (70%): Java (Spring, Spring Boot); Perl is a plus
- Frontend (30%): TypeScript, React
Role Overview
As a Software Engineer II, you design, build, and operate reliable software solutions across the Booking.com tech stack. You translate business requirements into high-quality, well-tested code, take ownership of services end-to-end, and collaborate closely with product, engineering, and operations teams.
Key Responsibilities
- Build, test, and maintain scalable backend and frontend applications
- Write clean, reusable, and well-tested code; continuously refactor and improve quality
- Own services end-to-end, including monitoring, deployment, and production support
- Troubleshoot and resolve production issues; contribute to post-incident reviews
- Contribute to system and architectural design decisions
- Improve reliability, performance, and development processes
- Communicate clearly with cross-functional stakeholders and mentor junior engineers
- Participation in an on-call rotation may be required
Rates depend on experience and client requirements
