Posted Oct 7, 2026

Freelance Backend Engineer (Scala)

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Responsibilities - Freelance Backend Engineer (Scala) What are you going to do? Leverage Scala for maintaining high-volume backend microservices and design backend architecture for an energy flexibility and trading platform; Undertake greenfield development of new microservices using Kotlin and Spring Boot to establish a future-proof ecosystem; Ensure timely delivery of implementations by communicating effectively with stakeholders and working independently; Demonstrate code excellence through clean, efficient, and well-documented code, participating in the full SDLC including testing and QA; For this specific project, we require prior experience with Scala because we have a tight deadline to finish it by the end of 2026, and it involves working with our legacy systems; Communicate with the stakeholders and independently ensure the implementation is delivered on time. Requirements - Freelance Backend Engineer (Scala) What do you bring? Senior-level backend software engineering experience; Expertise in JVM languages, specifically Scala; Strong background or deep interest in functional programming and API design; Proactive "learning by doing" mindset; Passion for environmental sustainability and thrives in a diverse work environment. The Offer - Freelance Backend Engineer (Scala) Join a leading sustainable energy company in Amsterdam for a permanent, full-time (32-40 hours/week) role. Freelance/ZZP or flex contract is possible under Independent Recruiters. Enjoy a balanced lifestyle with hybrid working and complimentary daily vegetarian lunches in a carbon-neutral office. For flex contractors, financial well-being is enhanced by a pension scheme, alongside practical allowances for phone/Wi‐Fi, and home office setup.