Senior Fullstack Developer (m/f/d)

Who We Are We are a truly international team and proud to play a central role in securing the electricity supply for Europe. As one of the leading Regional Coordination Centre (RCC), we and our partners, provide integrated services to 16 electricity transmission system operators (TSOs) and their control centers in 12 European countries. Our network security assessment and capacity calculation procedures, play an incremental role in securing the operational security of the European power system every hour of the day, around the clock. Working with us We are a smart and highly skilled bunch of people from more than 35 countries: In our team, we don't just pay lip service to diversity – we live it every day. What unites us, is the real motivation to develop and contribute to new ways and new standards for a secure energy supply in Europe. We actively work with our culture and use our company behaviours as compass for our performance. Build the foundation of our future application landscape. We are building up our in-house software development from the ground up - modern, cloud-ready, API-driven, and designed for long-term maintainability. If you're an experienced senior developer who loves shaping architectures, mentoring teams, and making things work beautifully, this is your chance to join at the very beginning of an exciting journey. You will make a lasting technical and cultural impact. We don’t just offer a great job – also great benefits We don’t just offer a great job – also great benefits A competitive salary package with performance-based pay and attractive compensation for contributions to the retirement scheme Financial and practical relocation assistance for employees from abroad to help them get started in Germany. Individual development and training plans with dedicated budget We prioritize health: A positive working environment, 24/7 hotline for enhanced mental health, bike leasing, coffee & tea and fresh fruit Plenty of staff events throughout the year Work-life balance through flexible working hours and hybrid working models Work from anywhere: Worldwide ‘Workation’ for up to 4 weeks a year This is what your day will look like Develop and maintain both frontend and backend components of our applicationsDesign end-to-end technical solutions based on business requirementsWork across the full software development lifecycle - from design to productionEnsure smooth integration between systems, services, and UI layersCollaborate closer with product owners, architects, business analysts and engineersSupport deployment, troubleshooting and production operations You come with Bachelor's or Master's degree in Computer Science / Software Engineering5+ years proven experience in fullstack development3+ years strong backend experience (at least Java / Java EE, Python)Solid knowledge of PostgreSQL and relational DB design Proficiency in modern backend and frontend framework(s)Strong grasp of APIs, databases, and web technologies (React / Angular)Practical experience with Git, CI/CD, Agile practices, and build automation tools (Maven, Gradle) and IaaC (e.g. Ansible, Terraform, Helm...)A problem-solving mindset and holistic technical understandingExperience in TDD (Test-Driven Development), understanding of SOLID principles, and clean code developmentAbility to mentor junior developers and perform code reviewsTechnical leadership skills, with proven experience in advising dev teamsStrong expertise in modern, cloud-native, and microservice architecturesA track record of designing and implementing maintainable, scalable, service-oriented future-proof systemsMotivation and enthusiasm to set up and work with modern software development methods, thus making cultural impact - shaping how we build software for the next decade