We are looking for a Senior Data Analyst for our client in Stockholm, to strengthen the measurement and analysis layer around their recommendation systems, working alongside engineering & product. Employment type : Fixed term ContractDuration : 6 MonthsLocation : StockholmJob Type: Onsite (Potential Hybrid option) Scope of the engagement● Own the measurement of recommendation experiments - design A/B tests, define success metrics, and deliver readouts that explain not just whether something worked but why.● Investigate model and system behavior: ranking quality, retrieval coverage, exposure and feedback effects, and the gaps between offline metrics and online outcomes.● Build the dashboards, data models, and self-serve tooling the team relies on to monitor recommendation health, and leave them in a state the team can maintain after the engagement.● Partner with engineers and PMs to scope analytical questions sharply - clarifying the objective and sizing the opportunity before they turn into long projects.● Surface insight proactively: the segment behaving oddly, the metric drifting, the counterfactual worth running.We care about the deliverables and the handover. Work should be reproducible and documented well enough that it outlives the contract.What you bring● 5+ years in an analytics or data science role, with a track record of operating independently and delivering with minimal ramp-up.● Direct experience with recommendation, search, ranking, ads, or another large-scale ML-driven product.● Strong SQL and comfort with large datasets (we work in BigQuery); fluency in Python for analysis beyond SQL.● A real grasp of experimentation - A/B testing, statistical significance, and the common traps (peeking, interference, novelty effects).● The instinct to clarify the ob…