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

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.

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

• 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 (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.