Senior Software Engineer; Backend; m​/w​/d

This is us

Lumenaza is a green-tech company building software for the decentralized energy world. Our platform enables energy providers to manage billing, market communication, and energy data — supporting renewable energy business models at scale.

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.

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.

• 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 Dev Ops 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.

• 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

• 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 / Type Script

• Interest in energy markets or regulated domains

• Python, Django, Django REST Framework

• PostgreSQL, Redis

• Celery (async processing)

• Docker, Kubernetes

• Git Lab CI/CD

• Robot Framework (testing)

• React (frontend)

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

• Impact:
  Build software that directly enables renewable energy business models

• Ownership:
  Work on complex, meaningful systems with real-world impact

• Growth:
  Structured onboarding and continuous learning

• Flexibility:
  Flexible hours and hybrid work setup

• Benefits:
  Competitive compensation, Deutschlandticket

• Location:
  
  Modern office in Berlin Kreuzberg

We strongly encourage applications from underrepresented groups in tech and are committed to building an inclusive environment.