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 skills

Must-Haves

• Degree in computer science or comparable field of study
• At least 5 years of professional software development experience, including 3+ years in Java (senior level).
• Understanding of Object-Oriented software design patterns and CLEAN code principles.
• Familiarity with threads, Java Executors, concurrency models, and asynchronous programming.
• Experience in implementing efficient data structures and data processing.
• Familiarity with unit and integration testing.
• Good communication skills in English (at least B2).
• Residence in Germany and a valid work permit.

Nice-to-Haves

• Experience building and managing Java projects with Maven.
• Experience with Docker, Jenkins, CI/CD pipelines.
• Experience designing and consuming API services.
• Experience with message brokers and asynchronous messaging in general (e.g., RabbitMQ, Apache Kafka).
• Knowledge of Spring Framework (Boot, Web, Messaging, Security).
• Familiarity with agile methodologies (Scrum, Kanban).
• Basic SQL skills for writing queries and understanding relational databases.
• Performance tuning, profiling, and optimization.
• Understanding of common software architecture notations and standards (UML, C4).
• Background in energy markets or trading.

How we work

We're an office-first team as we believe in working together in person. Our Leipzig office is where ideas get picked up in the hallway, problems get solved at the whiteboard, and the occasional table tennis match happens in between. Hybrid working is part of how we operate: typically one remote day per week, but with flexibility by arrangement with your team. For this role, we're looking for someone already based in Germany with a valid work permit – relocation support isn't available at this time.

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