Job Type Full Time Location Leipzig, Germany Workspace On-Site About us At Optimax Energy, we have been developing smart solutions for automated trading systems and promoting the transition to green energy for over 10 years. This makes us a leader in international electricity trading. Our culturally diverse team shares a common vision and fosters a culture of appreciation and equal opportunities. We believe that we can achieve extraordinary things if we develop freely. That's why we place great value on a healthy work-life balance and encourage creative freedom. We embrace diversity, equality and inclusion. Different perspectives and backgroundds strengthen our team and lead to creative solutions. To achieve this, we create an appreciative working environment that recognizes the uniqueness of all employees and retains talent in the long term. In order to actively shape the future of the energy sector, we are looking for outstanding, committed individuals who share our vision and corporate culture. Your responsibilities Further development and optimisation of the software infrastructure Requirements analysis, design and implementation of new features Backend development with Java 21 Expansion of our automated release process (continuous integration) and quality assurance (unit testing) Searching for and implementing own tasks Status Quo Java 21 Communication: YouTrack, work with agile methods IntelliJ; IDE: Eclipse (RCP as framework) CD: Jenkins Framework: up to you, we use Spring Your skills Must-Haves Degree in computer science or comparable field of study Passion for the field At least 6 years of development experience with Java Experience with multi-threading and design patterns Joy at problem solving, analytical approaches, proactive contribution of new ideas Joy at learning, further education and professional exchange and working together on projects Good (technical) English Nice-to-Haves Development experience with Kotlin Experience with microservices environment (Docker, Maven, Jenkins) Practical experience with message brokers such as RabbitMQ or Apache Kafka Further knowledge of our stack What we offer Health & well-being: Freshly cooked lunch every day Massages and Pilates in the office EGYM Wellpass Sports and mobility offers, such as subsidies for a new bike Flexible working arrangements and benefits: 30 days paid vacation Flexibility in working hours depending on company needs Additional vacation for the honeymoon Subsidies for childcare Team culture and working atmosphere: Regular team events (game night, table tennis tourament, excursions, etc.) Work in a mission-oriented, international team that values diversity and equality Working atmosphere with open doors and flat hierarchies Modern, green office in the heart of Leipzig Professional development and further training: Independence and responsibility in project management 10% of weekly working time for personal and professional development