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 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.
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 / TypeScript
Interest in energy markets or regulated domains
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.
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.
