Full Stack Engineer

Our client in Stockholm is looking for an experienced full-stack engineer, with ML and Data expertise, for their team. The PositionYou'll be working with a fast growing AI start-up building a product that uses agents to audit and optimises e-commerce ad spend. You'll be part of a small team and report directly to the CTO and split your time between shipping product and doing the data science behind it. The work:Building and owning prediction models, including the training pipelines, evals and recalibration when they driftKeeping the data honest: feature builders in SQL, versioned exports, backfills, no leakage, no silent schema driftShipping the features that turn model output into something that customers use.Prompt design and structured-output evals on the audit agent, across multiple LLM providers Stack: TypeScript (Node, Nest, React), Python for the ML (pandas, scikit-learn, XGBoost, PyTorch), PostgreSQL and BigQuery, everything running on GCP. Requirements5+ years of production experience in Software EngineeringStrong proficiency in TypeScript and comfortable in Python for ML/DS.You've shipped ML models people actually depended and know what good looks like.Good SQL and schema design instinctsExperience in the Cloud, ideally GCP.Fluent English Speaker, based in Stockholm