This is us
Building the digital infrastructure for a new renewable energy systemLumenaza 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.
Your profile
Core 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
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
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 (up to 2 days / week at the office)
Benefits: Competitive compensation, Deutschlandticket
Location: Modern office in Berlin Kreuzberg
You do not meet every technical requirement 100%, but you recognize yourself in the role and our mission? Then we look forward to receiving your application.