Backend Engineer - Data (m/f/d)

Berlin Mitte · Hybrid (up to 2 days/week remote) · €60,000–75,000 + VSOP equityHelp us decarbonize cement and concrete - not tomorrow, todayalcemy is on a mission to keep 100 million tons of CO₂ out of the atmosphere every year by 2030. Making concrete accounts for around 8% of global CO₂ emissions, and our machine-learning software runs inside cement and concrete plants 24/7 to cut it - without sacrificing quality or driving up costs. We're already live in a third of Germany's cement plants and 30+ ready-mix concrete plants.The roleYou'll own the systems that get plant data into alcemy.That data comes from external partners, and it arrives messy. You'll build and own the APIs and services that take it in, make sense of it, and feed the machine-learning models behind our recommendations - designing those systems, deploying them, keeping them running, and diagnosing what went wrong when something upstream changes without warning.It's a backend engineering role with a data problem at the centre of it, and it's refreshingly hands-on with customers: you'll dig into real-world data, explain what you find to non-technical people, and make getting data into alcemy dramatically easier.What you need is solid production Python, the ability to run what you build, and comfort talking to the people on the other end of the pipe.What you'll doOwn the data ingestion systems that bring messy plant data from external partners into something our ML can useBuild and improve our ingestion APIs, moving us from strict, structured data requirements toward flexible, AI-powered ingestion — so customers onboard with far less frictionDeploy, monitor and troubleshoot your systems in production, diagnosing and fixing issues when something upstream changes without warningTrack down data anomalies and explain your findings to customers in plain languageBuild and maintain the APIs and PostgreSQL databases behind our products, and keep production running smoothlyWork shoulder to shoulder with extern