Senior Software Engineer (Fullstack) (m/w/d) at Lumenaza GmbH | BE, DE | Rezi

Senior Software Engineer (Fullstack) (m/w/d) at Lumenaza GmbH

Senior Software Engineer (Fullstack) (m/w/d)

Lumenaza GmbH · BE, DE

Today

Senior Software Engineer (Fullstack) (m/w/d)

Lumenaza GmbH · BE, DE

19 hours ago
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About the 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.

Responsibilities

  • 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 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

Requirements

  • 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

Skills

  • FastAPI
  • Pydantic
  • Django Ninja
  • Celery
  • React
  • TypeScript
  • Python
  • Django
  • Django REST Framework
  • PostgreSQL
  • Redis
  • Docker
  • Kubernetes
  • GitLab CI/CD
  • Robot Framework
  • Energy markets
  • Regulated domains

Location

  • Berlin Kreuzberg

Work Type

  • Hybrid

Experience Level

  • Senior

Benefits

  • Competitive compensation
  • Deutschlandticket

About the Company

  • 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.