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.
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.
Senior Software Engineer (Backend) (m/w/d) • Berlin, DE
Die eRecht24 IT GmbH entwickelt digitale Lösungen rund um IT-Recht, Datenschutz und Compliance.Unsere Plattformen unterstützen tausende Unternehmen dabei, rechtssicher im Internet zu agieren.Wir en...Mehr anzeigen
Technisches Studium und solide Grundlagen der Informatik.Jahre Erfahrung in der Softwareentwicklung.Full-Stack: sicher im Frontend und Backend.Fhigkeit, sich schnell in neue Technologien einzuarbei...Mehr anzeigen
Wir sind adesso business consulting, das SAP-Powerhouse der adesso Group.Als führender IT-Dienstleister stehen wir für Kundenorientierung, Wachstum und starke Perspektiven.Unser größter Erfolgsfakt...Mehr anzeigen
Wenn du dich für Capgemini entscheidest, wählst du ein Unternehmen, in dem du die Möglichkeit hast, deinen Karriereweg selbst zu gestalten.Du wirst von einem kollaborativen Netzwerk von Kolleg*inne...Mehr anzeigen
These tasks are waiting for you.You'll be a core contributor to the Admin Experience team.Design and develop secure, well-tested features across a TypeScript/Node.Contribute to our API-first infras...Mehr anzeigen
Wir suchen einen Senior Software-Entwickler (m/w/d).Vollzeit) Schließe dich unserem Team an unserem Standort in Berlin, Verl oder Baden-Baden an – hybride Arbeitsbedingungen verfügbar.Du bist ein l...Mehr anzeigen
Bei IONOS arbeitest Du bei dem führenden europäischen Anbieter von Cloud-Infrastruktur, Cloud-Services und Hosting-Dienstleistungen partnerschaftlich mit unterschiedlichen Teams zusammen.Wir bieten...Mehr anzeigen
Forme mit uns Zukunft als Senior-Softwareentwickler*in im Geschäftsbereich Software- und Systemtechnik in Berlin.Begleitung von Softwareprojekten von der Entwurfsphase über die Implementierung bis ...Mehr anzeigen
Werde auch du "part of netgo group" - einem der größten IT-Dienstleister Deutschlands.Mitarbeiter*innen an zahlreichen Standorten in ganz Deutschland erwarten dich als neues Teammitglied.Dies beinh...Mehr anzeigen
Join bonify, Germany’s leading platform for credit scoring and financial management.We are on the mission to revolutionize the FinTech industry and make the credit score and financial data availabl...Mehr anzeigen
FIXING THE PLANET BY MAKING HOMES CARBON-FREE!.With €40 million in funding from top-tier investors such as COATUE, Foundamental & Target Global, we are working towards a future where climate-neutra...Mehr anzeigen
As our customer base and data volume grow, the hard problems are no longer features, but correctness, performance, and robustness.This role is about building practical, reliable solutions to real-w...Mehr anzeigen
At Superchat, we’re reimagining how businesses communicate with their customers.Our mission is simple: Communicating with a business should be as easy and natural as talking to a friend.You take ow...Mehr anzeigen
Senior Software Engineer – AI-Driven Platform & Agentic Systems (m/w/d) at virtualQ GmbH | softgarden.Senior Software Engineer – AI-Driven Platform & Agentic Systems (m/w/d).Q develops an enterpris...Mehr anzeigen
Wir verbinden Technologie, Marktverständnis und ein Netzwerk aus über 300 Banken und Spezialfinanzierern, um kleinen und mittleren Unternehmen schnellen und strukturierten Zugang zu Kapital zu ermö...Mehr anzeigen
Lage komplexe Sachverhalte einfach zu erklären.Als Softwareengineer unterstützt du L21s in Kundenprojekten als.Teams aus internen und externen Kollegen.Abgeschlossenes Hochschulstudium der.L21s hat...Mehr anzeigen
Living on wind and sunlight forever for free.To make this a reality, we are building the energy system of the future with Heartbeat AI.We bring together regional craftsmanship and scalable software...Mehr anzeigen
Du verfgst ber mehrjhrige praktische Erfahrung in der Software-Entwicklung.Du besitzt sehr gute Deutsch- und Englischkenntnisse (mind.C1-Niveau) fr eine klare und sichere Kommunikation im Team und ...Mehr anzeigen
