Java Backend Engineer (Kotlin)

Are you a Senior Backend Engineer looking to leverage your expertise to make a tangible impact on a sustainable future? Our client, a leading renewable energy company based in the vibrant city of Amsterdam, is embarking on a significant technological evolution. They are transitioning their core platform from Scala/ZIO to a modern architecture powered by Kotlin and Spring Boot, and they are seeking a talented Backend Developer to help build this greenfield future. This is more than just a coding role; it's an opportunity to contribute directly to their mission of delivering 100% green energy by developing scalable, high-quality services that underpin their innovative platform. As part of a collaborative, cross-functional team, you will translate complex energy sector challenges into elegant backend solutions, fostering a culture of continuous learning and knowledge sharing. If you're ready to shape the technological backbone of a sustainable energy leader and drive innovation, we encourage you to explore this exciting opportunity!  What are you going to do? • Design and build new microservices using Kotlin and Spring Boot; • Develop and maintain clean, performant APIs for React and React Native frontends; • Create clean, efficient, and well-documented code with increasing independence; • Participate in all development stages, including testing, code reviews, and quality assurance; • Foster a collaborative environment by sharing ideas, feedback, and mentoring other developers. What do you bring? • Proven senior experience building Kotlin services and a keen interest in API Design; • Proficiency with Spring Boot or similar JVM frameworks; • A strong product mindset focused on end-user experience and building from scratch; • Experience in product-based companies, ideally in cross-functional teams, and a commitment to clean, maintainable code; • Comfortable communication, bridging technical/business gaps, and using observability tools/metrics to validate features. Join a leading sustainable energy company in Amsterdam for a permanent, full-time (32-40 hours/week) role offering a gross monthly salary of €4,800 - €6,000 (based on a 40-hour work week), depending on your experience, excluding holiday allowance. You'll be directly employed by the client and benefit from an attractive package, including: an annual bonus, 30 paid vacation days, and the ability to work abroad for up to 6 weeks annually. They also foster employee well-being with sabbatical options, special leave for personal events, and a €1200 annual learning budget with L&D workshops. Financial well-being is enhanced by a pension scheme, alongside practical allowances for phone/Wi-Fi, and home office setup. Enjoy a balanced lifestyle with hybrid working and complimentary daily vegetarian lunches in a carbon-neutral office. How we'll proceed. Within four working days we will let you know if you qualify for the position. We will schedule an introductory interview, either digitally or in-person. During this interview we will inform you as fully as possible about the vacancy, the company and the following steps in the procedure. After consulting with you, we will introduce you to our client and then continue to guide you through the application process. The Independent Recruiters Group has a large team of specialized recruiters. Each recruiter has a strong focus on their own area of expertise. This makes them the ideal sparring partner for both the candidate and the client.