Senior Software Engineer (Backend) (m/w/d) - Virtual Power Plant (VPP)

We are a green-tech company shaping the energy industry towards a more sustainable future. At Lumenaza, you have the opportunity to actively contribute to the world of decentralized and renewable energy. Our mission is to drive the energy transition forward — with passion and innovation.

Lumenaza stands for clear values: sustainability, diversity, and collaboration. We take pride in our diverse team and are committed to supporting women in tech.

You will receive thorough onboarding into the energy market processes and gain access to an exciting, future-proof industry. We know how complex the energy market can be, which is why we actively share our expertise to ensure you can succeed, regardless of your previous experience in the sector.

We invite you to join our growing development team as a Senior Software Engineer (Backend) in Berlin (m/f/d).

Your tasks

As a Senior Software Engineer (Backend), you and your team will further develop our Virtual Power Plant (VPP), which controls hundreds of decentralized energy assets and aggregates them for trading on the electricity market. This includes implementing new process views and developing microservices.

Contribute to the energy transition:

You’ll design and implement scalable software solutions enabling demand-based control, comprehensive monitoring, and profitable flexibility mechanisms for generation assets and battery storage systems — making a direct impact on the success of the energy transition.

Shape complex systems:

From concept and implementation to quality assurance — you’re involved in every step. You’ll work on the development of microservices handling large volumes of measurement, forecasting, and balancing data, and use observability measures to enhance transparency, stability, and scalability.

Solve technical challenges:

The energy market is complex and dynamic. You’ll develop robust and scalable solutions in Python and Django, tackling challenges such as asynchronous processing, domain modeling, and distributed systems, all while addressing demanding design and performance questions.

Collaborate across teams:

You’ll work closely with colleagues in backend, frontend, and DevOps, as well as Product Owners. Together, you’ll design innovative cloud solutions, share knowledge, and actively shape architecture decisions. You’ll collaborate within an agile Scrum environment, participating in sprint planning, reviews, and retrospectives to continuously improve both product and process.

Stay curious and share knowledge:

You keep up with current trends in software design, bring new ideas to the team, and contribute to the continuous evolution of our platform.

Bridge legacy and future:

You’ll help maintain existing systems while supporting their migration into modern microservice architectures, ensuring the sustainable development of our overall system landscape.

Do you want to help shape the energy industry of tomorrow? We value enthusiasm for sustainability over perfection — diversity and a willingness to learn are what count. Apply and help us shape the future.

Must-haves* Degree in Computer Science or a comparable qualification

At least 5 years of experience as a backend software engineer, ideally in complex, distributed system landscapes

Excellent knowledge of Python, SQL, and Django

Solid experience with Django REST Framework and designing/integrating REST APIs

Experience with microservice architectures and distributed systems

Confident handling of Docker and Docker Compose

Practical experience with pytest or similar testing frameworks

Understanding of modernizing legacy systems

Passion for Clean Code, automation, and CI/CD

Strong communication skills in English

Experience with PostgreSQL, Git, and Linux systems

Knowledge of Pandas for data-driven applications

Nice-to-have Experience with TimescaleDB, Elasticsearch, Redis, and object storage* (e.g., S3)

Hands-on experience with Temporal or similar workflow engines (e.g., Airflow)

Experience with Celery and asynchronous programming

Practice in implementing and maintaining ETL pipelines

Knowledge of Pydantic

Experience using Robot Framework for test automation

Experience with Smart Metering data (high-frequency time series processing)

Basic understanding of the German energy market and its regulatory framework

Knowledge of TypeScript and React

German language skills are a plus

Our core processes are built in Python/Django, with PostgreSQL as the primary database.

We use the Robot Framework for system testing and deploy containerized code through a GitLab-based CI/CD pipeline to Kubernetes test and production environments.

Frontend applications are implemented using React.

At Lumenaza, you will become part of a dedicated team of over 50 employees, including more than 20 developers. Within our motivated Power Market Processes team, which currently consists of four developers including you, you will not just be another member, but a valued part of our team who contributes to its strength. We value different perspectives and encourage active exchange and collaborative learning so we can grow together.

At Lumenaza, you’ll find not only unique benefits but also a culture of support and continuous development:

Comprehensive onboarding and training:

New team members are supported through tailored training programs to expand their skills and expertise.

Flexibility for a better work-life balance:

Enjoy flexible working hours and the option to work from home part of the week, helping you balance work and personal life effectively.

Attractive additional benefits:

In addition to fair pay, we offer perks such as a discounted electricity tariff and a reduced-price Deutschlandticket.

Modern work environment:

Our office in Berlin-Kreuzberg provides an inspiring workspace that fosters creativity and productivity.

Innovation at the heart of the energy transition:

Join our team at the forefront of energy innovation and help revolutionize the industry.

Lumenaza GmbH, through its brand Lumenaza.Community, is a leading provider of direct marketing for small-scale installations and a supplier of electricity for household tariffs ranging from fixed to dynamic contracts. The Lumenaza Community represents green, decentralized electricity generation.

Since 2013, Lumenaza GmbH has also been supporting major energy supply companies such as EnBW and E.ON as a software and service provider, offering innovative solutions in billing, market communication, and virtual power plants.

For more information, visit Lumenaza.Community and www.lumenaza.com.