Berlin, Germany · Hybrid
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 ener…
Skills: Python, Django, REST APIs, PostgreSQL, Docker
Berlin, Germany · On-site
<p>ITM is at the forefront of the green hydrogen industry, designing and manufacturing cutting-edge PEM electrolysers that are instrumental in global decarbonisation efforts. With over two decades of scientific expertise…
Skills: Procurement Governance, Strategic Sourcing, Contract Management, Supplier Performance Management, ERP Integration
Berlin, Germany · On-site
Senior Procurement Manager (Governance, Systems & Strategy) ITM Power Location: Berlin Direct Applications Only - No Agency Applicants at this time About ITM Power ITM is at the forefront of the green hydrogen industry, …
Skills: Procurement Governance, Strategic Sourcing, Contract Management, Supplier Performance Management, ERP Implementation
Berlin, Germany · On-site
<p><strong>Deutsch</strong><br><strong>Bike Club ist</strong> <strong>ein Abo-Service für hochwertige</strong> <strong>Kinderfahrräder: Das Fahrrad</strong> <strong>wird</strong> <strong>einfach</strong> <strong>gegen</s…
Skills: Bicycle Mechanics, Refurbishment, Workshop Management, Team Coordination, Onboarding
Biojoule Group KarriereBerlin, Germany · Hybrid
Unsere Vision BonFry ist ein Service-Dienstleiser für Gastronomie, Hotellerie und Lebensmittelproduktion. Wir setzen auf die nachhaltige Nutzung von Altspeisefett als Ressource für die Kraftstoffproduktion. Unsere Vision…
Skills: Accounting, Controlling, Financial Planning, Excel, Google Sheets
Berlin, Germany · Hybrid
Unsere Vision BonFry ist ein Service-Dienstleiser für Gastronomie, Hotellerie und Lebensmittelproduktion. Wir setzen auf die nachhaltige Nutzung von Altspeisefett als Ressource für die Kraftstoffproduktion. Unsere Vision…
Skills: Accounting, Controlling, Financial analysis, Excel, Google Sheets
Berlin, Germany · On-site
Gemeinsam etwas bewegen Wir sind mehr als nur ein Unternehmen – wir sind ein Team aus kreativen Köpfen, die sich für zukunftsweisende Architektur und ideenreiche Bauprojekte engagieren. Bei Vollack schaffen wir nicht nur…
Skills: Calculation, Construction engineering, Architecture, Project development, Cost assessment
Kenntnisreich Kindertagesstätten gGmbHBerlin, Germany · On-site
Warum wir? Werde Teil der Kenntnisreich-Familie! Wir suchen Dich – gerne auch gemeinsam mit Deinen LieblingskollegInnen. Unsere Kita „Kenntnisreich am Görli“ ist bereits seit Januar 2026 geöffnet und nun bauen wir unser …
Skills: Pedagogical Planning, Child Development Support, Project Management, Observation and Documentation, Teamwork
Berlin, Germany · On-site
<p><strong>FASTR</strong> ist einer der führenden Energiedienstleister in Deutschland. Wir haben unseren Hauptsitz in <strong>Düsseldorf</strong>, wurden1989 in <strong>Aachen</strong> gegründet und verfügen über eine Ni…
Skills: Heating Technology, Fault Management, Efficiency Analysis, Building Control Systems, Project Management
Berlin, Germany · On-site
<p><strong>FASTR</strong> ist einer der führenden Energiedienstleister in Deutschland. Wir haben unseren Hauptsitz in <strong>Düsseldorf</strong>, wurden1989 in <strong>Aachen</strong> gegründet und verfügen über eine Ni…
Skills: Heating Technology, HVAC, Building Technology, Fault Management, Efficiency Analysis
Berlin, Germany · Hybrid
$60k–$85k/yr
Deine Mission In deiner Rolle als Sales Manager:in trägst du aktiv dazu bei, die Dekarbonisierung von Gebäuden voranzutreiben und einen bedeutenden Beitrag zur Klimaneutralität zu leisten. Mit deinem Verkaufstalent überz…
Skills: Sales, Communication, Customer relationship management, CRM, Negotiation
Berlin, Germany · On-site
<h2 id="jobbeschreibung">Jobbeschreibung</h2> <p>Hey! </p> <h2 id="wir-sind-vly--ein-innovatives-foodtech-startup-aus-berlin-das-die-lebensmittelindustrie-revolutioniert-unser-ziel-gesunde-pflanzliche-milchalternativen-d…
Skills: Supply Chain Management, Production Planning, Procurement, Supplier Management, Partnership Building
Berlin, Germany · Remote OK
Das erwartet dich Nachhaltigkeit, Energiewende, Digitalisierung – Du bist bereit für die großen Themen und hast Lust bei unseren Kunden neue Impulse zu setzen? Dann sei als Consultant an unserem Standort in Berlin zusamm…
Skills: Strategy consulting, Market analysis, Benchmarking, Business planning, Liquidity planning
Berlin, Germany · On-site
<p>Zur Verstärkung unseres Teams suchen wir <strong>Architekten und Bauingenieure (m/w/d)</strong> o.Ä., die Interesse daran haben, sich im Bereich <strong>Energieberatung</strong> weiterzuentwickeln oder neu einzusteige…
Skills: Energy consulting, Energy efficiency, Sustainability, Building services engineering, Sanitation concepts
Berlin, Germany · On-site
<p><strong>Berlin, Office 15-20 Std. ab sofort</strong></p> <p>Du willst nicht nur arbeiten, sondern die Arbeitswelt mitgestalten? Dann komm zu uns und werde Teil eines Purpose-getriebenen Teams für eine faire und nachha…
Skills: Python, Pandas, SQL, Data cleaning, Data validation
Berlin, Germany · On-site
Deine Mission Du bist unser E-Technik-Mastermind und deckst ein breites Spektrum ab. Für unsere Batteriespeicher-Produkte entwickelst du Hardwarekonzepte, die es so heute noch nicht gibt von der Idee bis zur Umsetzung. D…
Skills: Medium voltage engineering, Battery storage systems, Grid connection, Hardware development, Project management
Berlin, Germany · On-site
Deine Mission Du bist unsere Expert:in für die bauliche Realisierung unserer Speicherprojekte. In dieser Schnittstellenfunktion kombinierst du tiefes bautechnisches Wissen mit agilem Projektmanagement. Du sorgst dafür, d…
Skills: Civil engineering, Project management, Battery storage systems, Renewable energy, Permitting
Berlin, Germany · On-site
$3k–$4k/mo
Kurz vorweg, ehrlich: Das ist ein Field-Sales-Job an einem Stand im Einkaufscenter. Du brauchst dafür absolut keine Vertriebserfahrung, aber jede Menge positive Energie und Lust auf Menschen. Du hast im Verkauf, an der K…
Skills: Customer Consulting, Sales, Communication, Customer Acquisition, Resilience
TroveBerlin, Germany · Remote OK
<p>Brands lose billions each year to returns, excess inventory, and non-new product. Trove transforms that liability into a growth engine.</p> <p>We provide the software and operational infrastructure that enables leadin…
Skills: Reverse Logistics, 3PL Management, Warehouse Management Software, Supply Chain Optimization, Vendor Management
Berlin, Germany · On-site
Das Projekt / Die Stelle Das steht an: Du passt zu uns, wenn Du nicht alles weißt, aber alles wissen willst. Sei offen, sei neugierig und lerne uns kennen. Das bringst Du mit: Wir sind offen für (fast) alle akademische…
Skills: Curiosity, Communication, Teamwork, Energy efficiency, Project management
Sign up with Clera and we'll reach out the moment a role actually fits you — no more spraying applications into the void.
You will design and build core backend systems for billing, tariff models, and energy market processes. You will also collaborate across disciplines to modernize legacy systems and drive engineering improvements.
Candidates must have 5+ years of backend development experience with strong expertise in Python and Django. Proficiency in designing REST APIs, working with distributed systems, and using PostgreSQL is required.
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.
Future-proof energy industry: Digital. Flexible. Scalable.
Lumenaza GmbH is a Berlin-based company that develops solutions driving the digitalization of the energy transition, enabling both individuals and businesses to benefit from the generation and use of green energy. Through its SaaS platform, Lumenaza has been transforming companies into aggregators of electricity and electricity suppliers since 2013. Within its end-to-end solutions for aggregation of electricity and electricity tariffs under a white-label model, Lumenaza takes on areas such as billing, balancing group management, business process outsourcing (BPO), CRM, flexibility, customer communication, customer portals, market communication (MaKo), product catalog, redispatch, electricity trading, and virtual power plants. Lumenaza’s SaaS platform serves customers including energy suppliers/municipal utilities, aggregators of electricity/electricity traders, and new market players/OEMs, such as Octopus Energy, EnBW, E.ON, Hycube, SonneNext, and Regionah Energie. Under the LUOX Energy brand, Lumenaza GmbH offers end customers a green, dynamic electricity tariff that allows them to purchase electricity at exchange prices and, through biogas, wind, or solar installations, to feed their green electricity into the market at exchange prices via aggregation of electricity.
Offices: Kreuzbergstr. 30, Aufgang 3, 4 OG, Berlin, 10965, DE
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