Senior Backend Engineer (m/w/d)

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-neutral buildings - simply & rapidly - become a reality. Through tailored solutions for millions of homeowners, we implement comprehensive energy-efficiency renovation projects, thereby establishing the infrastructure for climate-neutral living.

As a Senior Backend Engineer, you’ll design and build the systems that power our platform — from customer-facing experiences to the data pipelines that drive automation, insights, and decision-making.

You’ll work closely with product, design, frontend, and data teams to deliver reliable, scalable systems with real-world impact.

DEINE AUFGABEN

• Design, build, and maintain scalable, production-ready backend services
• Work across our platform — from customer-facing flows to internal systems and data pipelines
• Write and extend services primarily in Golang, TypeScript, and Python
• Drive architectural decisions, especially around our data core and automation pipelines
• Build and improve systems that transform customer data into actionable insights
• Ensure high code quality through testing, code reviews, and clean architecture
• Improve system reliability via CI/CD, monitoring, and alerting
• Collaborate closely with product and stakeholders to translate business needs into robust technical solutions
• Identify opportunities for product and operational improvements based on data and system insights

DEIN PROFIL

• 5+ years of experience building backend systems in production environments
• Strong proficiency in Golang and solid experience with TypeScript and/or Python
• Experience designing and operating distributed systems and microservices architectures
• Strong understanding of event-driven systems (e.g. Kafka, NATS JetStream)
• Experience with cloud infrastructure (AWS or GCP)
• Hands-on experience with Docker and Kubernetes
• Familiarity with CI/CD tools (e.g. GitHub Actions, CircleCI, Terraform)
• Experience with databases such as PostgreSQL, DynamoDB, MongoDB, or Cassandra
• Strong understanding of API design (REST, GraphQL)
• Comfortable contributing to frontend or user-facing components when needed to deliver end-to-end solutions
• Experience with monitoring and observability (e.g. Prometheus, Grafana, ELK)
• Solid understanding of performance optimization, caching, and database efficiency
• Experience with authentication/authorization (e.g. OAuth, FirebaseAuth)
• You write well-tested code and are comfortable with unit and end-to-end testing
• Full working proficiency in English (German is a plus)

BENEFITS

• Become part of one of Europe's fastest growing Climate Tech Startups - funded by Europe's best known VC's
• Attractive & competitive compensation
• Work with top talent in a dynamic environment Individual benefits: learning budget, Urban Sports Clubs membership, job ticket or daycare allowance
• Office with a direct view of the Spree River, with everything your heart desires
• Numerous team events, including yoga