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About the roleWe are on the mission to build Europe’s leading energy management platform to provide fair, clean energy to everyone. We’re a diverse team of 50+ employees (46% female, 16+ nationalities), and we’re looking for passionate people to join our mission.You will join the Tech team (twenty people: sixteen engineers and four in Product). As part of a cross-functional team, you will focus on projects related to new business, alongside projects to reduce our Operations load—so we can grow faster with a lean team.Your MissionDesign and build backend solutions from scratch.Take part in tech stack decisions—choosing the best tools, frameworks, and processes for the team.Help develop a scalable platform for the renewable energy sector using modern technologies.Integrate new product lines like smart meters, dynamic pricing, EV charging, and more.What we're looking for3+ years of backend development experience.Strong experience with TypeScript.Confident designing and building APIs.Solid understanding of relational databases.Commitment to writing clean, testable code (unit, integration, and E2E testing).Comfortable working on greenfield projects and building systems from the ground up.Strong communication skills and fluency in English.Familiarity with CI/CD workflows (e.g., Docker, GitHub Actions).You can view our full tech stack here.Nice to haveExperience with AWS services (ECS, RDS (Aurora), S3, CloudWatch, Lambda).Experience with React or React Native, or willingness to learn new technologies and take on full-stack tasks when needed.Experience using AI tools (e.g., for debugging, documentation, testing)—we value developers who integrate AI into their daily workflow to boost productivity, with a practical mindset.Interview processTestGorilla AssessmentA short online assessment to help us understand your skills and working style.Technical Interview with our Engineering TeamA conversation focused on your technical abilities, problem-solving approach, and practical experience.Interview with the People TeamMeet the People Lead to explore Ostrom's values and our company culture.Interview with our Head of EngineeringA conversation with our Head of Engineering to explore your experience, working style and alignment with the role.Co-Founder InterviewA final conversation to discuss alignment, culture, ownership, and your impact on Ostrom as a whole.Why Ostrom?Environmental Impact: Each customer who switches to Ostrom on average helps offset 1.5 tons of CO2 emissions per year compared to the average German energy mix.Flexibility: We offer a hybrid work model with a dog-friendly office in Berlin, Mitte, in case you prefer working in the office.Relocation package: If you want to move to Germany, we offer a visa and relocation support.Trust-based Team: A truly flat hierarchy and transparent company culture, where everyone’s voice matters.Personal development: An annual growth budget, frequent development 1:1s, and development cycles held twice a year.Benefits: From monthly team events to discounted gym membership, a ticket for public transport, e-Moped or e-Bike via Dance, Futurebens, and monthly vouchers.Work your wayWhether you prefer the office, your home desk, or a sunny spot in Sardinia—you work where you work best.About usWe’re Germany’s fastest-growing digital green energy provider and a Certified B Corp™ , driving the energy transition by making renewable energy more accessible and inclusive. Through variable tariffs, dynamic pricing, smart EV charging, heat pump and solar optimization, and Germany’s first virtual power plant: NeoGrid™.
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