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Senior Software Engineer (Backend) (m/w/d) – Team Billing

Lumenaza
Berlin

Jetzt bewerben

Details zur Stelle

Leistungen

Homeoffice-Möglichkeit
Flexible Arbeitszeiten
Kostenfreies oder vergünstigtes Deutschland-Ticket

Qualifikationen

CI/CD
Informatik
React
Kubernetes
ERP-Systeme
Testautomatisierung
Git
Docker
PostgreSQL
Verteilte Systeme
Redis
Rechnungswesen
REST
Django
APIs
Agile
S3
Linux
TypeScript
GitLab
Kommunikationsfähigkeit
Python
Deutsch

Vollständige Stellenbeschreibung

This is us

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 processes of the energy market and gain access to an exciting, future-proof industry. We are well aware of the energy market’s complexity, which is why we place great importance on sharing knowledge and ensuring that you can succeed — regardless of your previous industry experience.

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

Your tasks

As part of our team, you will work on solutions for the billing and monetization of energy services and the related business processes.

Contribute to the energy transition:
You design and develop software solutions that enable our customers to reliably and efficiently implement complex tariff models, billing workflows, and accounting-related processes. Your work directly supports economically sustainable business models in renewable energy.
Shape complex systems:
From concept and implementation to quality assurance, you are involved in every step. You help design and evolve billing logic, data models, and product catalogs, ensuring long-term maintainability, scalability, and domain correctness.
Solve technical challenges:
Billing systems place high demands on accuracy, traceability, and performance. You develop robust and scalable solutions using Python and Django, working on data modeling, asynchronous processing, batch processing, distributed systems, and the integration of external billing and accounting systems, while tackling demanding design and performance challenges.
Collaborate across teams:
You work closely with colleagues from backend, frontend, DevOps, Product Management, and adjacent domains such as Finance and Operations. Together, you design cloud-based solutions, share knowledge, and actively shape architectural decisions. In an agile environment, you contribute to the continuous improvement of both product and processes.
Stay curious and share knowledge:
You keep up with current trends in software design, bring new ideas into the team, and support the continuous evolution of our billing platform.
Bridge legacy and future:
You help maintain existing systems while supporting their ongoing evolution and gradual modernization, contributing to the sustainable development of our billing and system landscape.

Your profile

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.

A degree in Computer Science, Business Informatics, or a comparable qualification
At least 5 years of experience as a backend software engineer, ideally in domain-complex, data-driven systems
Excellent knowledge of Python and Django
Solid experience with the Django REST Framework
Practical experience designing, developing, and 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 working with business-critical legacy systems and their evolution
Passion for clean code, automation, and CI/CD
Strong communication skills in English
Experience working with PostgreSQL, Redis, and object storage (e.g., S3)
Confident use of Git
Experience working with Linux systems
Knowledge of Celery and asynchronous programming

Nice-to-have

Experience with Pydantic, FastAPI, or Django Ninja
Experience using the Robot Framework for test automation
Experience integrating external accounting or ERP systems (e.g., DATEV, SAP)
Experience with Temporal or similar workflow orchestration tools
Knowledge of TypeScript and React
German language skills are a plus

Our Tech Stack

Most of our systems are built with Python and 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.

We offer you this

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

Comprehensive onboarding and training:
Tailored programs and active knowledge sharing to support your professional growth.
Flexibility for a better work-life balance:
Flexible working hours and the option to work from home part of the week.
Attractive additional benefits:
Fair pay, a discounted electricity tariff, and a reduced-price Deutschlandticket.
Modern work environment:
An inspiring office in Berlin-Kreuzberg that fosters creativity and productivity.
Innovation at the heart of the energy transition:
Join a team working at the forefront of energy innovation and help shape a sustainable future.

Jetzt bewerben

Erweiterte Suche

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