> Markdown version of [/jobs/ext/1381196-senior-software-engineer-backend](https://www.wearedevelopers.com/jobs/ext/1381196-senior-software-engineer-backend). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Software Engineer (Backend)

- **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, Build Management, Gitlab-ci, Kubernetes, Celery, Front End Software Development, Restful APIs, Docker, Legacy Systems, Microservices
- **Published:** July 22, 2026
- **Apply:** https://www.adzuna.de/details/5727283811

## 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
 * Strong 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.

## Description

As a Senior Backend Engineer, 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.


## Related Videos

- [Celery on AWS ECS - the art of background tasks & continuous deployment](https://www.wearedevelopers.com/videos/561-celery-on-aws-ecs-the-art-of-background-tasks-continuous-deployment)
- [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered)
- [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis)
- [Inside Bitpanda's Tech Stack: Scaling a European Fintech Leader - Markus Dorner](https://www.wearedevelopers.com/videos/1979-inside-bitpanda-s-tech-stack-scaling-a-european-fintech-leader-markus-dorner)
- [Walking into the era of Supply Chain Risks](https://www.wearedevelopers.com/videos/376-walking-into-the-era-of-supply-chain-risks)
- [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker)

## Related Articles

- [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers)
- [The Biggest German Tech Companies](https://www.wearedevelopers.com/magazine/424-the-biggest-german-tech-companies)
- [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)
- [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers)
- [Backend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/196-backend-developer-salary-in-germany-2023)
- [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)