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# Senior Software Engineer (Fullstack)

- **Company:** Lumenaza GmbH
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Architectural Patterns, Databases, Continuous Integration, DevOps, Distributed Systems, Django Web Framework, Python (Programming Language), PostgreSQL, Redis, Systems Architecture, Systems Integration, TypeScript, ReactJS, Backend, Fastapi, Gitlab-ci, Kubernetes, Celery, Front End Software Development, Restful APIs, Docker, Legacy Systems, Microservices
- **Published:** September 22, 2026
- **Apply:** https://www.adzuna.de/details/5894545568

## About the Role

* 5+ years of backend development experience
 * Strong Python and Django expertise
 * Experience designing and building REST APIs
 * Experience with distributed systems / microservices
 * Solid understanding of databases (PostgreSQL)
 * Experience with Docker and CI/CD workflows
 * Excellent communication skills in English

Nice to Have

 * Experience with FastAPI, Pydantic, or Django Ninja
 * Knowledge of Celery or similar async tools
 * Experience integrating external systems (e.g. ERP, APIs)
 * Familiarity with React / TypeScript
 * Interest in energy markets or regulated domains

Our Tech Stack

 * Python, Django, Django REST Framework
 * PostgreSQL, Redis
 * Celery (async processing)
 * Docker, Kubernetes
 * GitLab CI/CD
 * Robot Framework (testing)
 * React (frontend)

We deploy continuously to Kubernetes and work with distributed systems handling complex, business-critical data.
We offer you this

## Description

Berlin, 10965
Unbefristet
Vollzeit
This is us

Building the digital infrastructure for a new renewable energy system
Lumenaza builds this digital infrastructure. Our platform connects renewable generation, dynamic tariffs, energy-market processes, and the processing of large volumes of complex energy data. This enables utilities and new market participants to operate decentralized and renewable business models in everyday practice.

We are driven by a clear mission: accelerating the transition to a sustainable energy system. At the same time, we value diversity, collaboration, and continuous learning.Your tasks

Your Role

As a Senior Engineer (Fullstack), you will design and build core systems that power real-world energy processes - from billing to market communication.

You take ownership of complex domains, contribute to architectural decisions, and help evolve both our systems and engineering practices.

What You'll Do

 * Build and own core backend systems
Design and implement scalable solutions for billing, tariff models and energy market processes.

 * Shape system architecture
Work across the full lifecycle - from design to deployment - ensuring maintainability, scalability, and correctness.

 * Solve complex technical challenges
Develop robust solutions involving data modeling, asynchronous processing, and distributed systems.

 * Collaborate across disciplines
Work closely with Product, Frontend and DevOps to deliver cloud-based solutions and improve our platform.

 * Drive improvement and innovation
Bring in new ideas, improve engineering practices and explore modern development approaches, including AI-assisted workflows.

 * Modernize existing systems
Help evolve and migrate legacy systems toward modern architectures.