Senior Data Engineer (Search)

About the role

Own search at Cortea. You'll design and ship retrieval, ranking, and evaluation systems that power our AI agents. You'll also build the data pipelines behind them. You'll work closely with product, design, and founders to turn messy, real-world documents into precise answers.

What you'll do

• Build and tune retrieval and ranking: lexical + neural
• Own evaluation: datasets, metrics, dashboards, and regressions
• Design data pipelines for ingestion, enrichment, and classification
• Ship production code: Python services, APIs, SQL models, tests
• Improve relevance through experimentation and systematic analysis

What you'll need

• 5+ years as a software engineer or applied scientist with hands-on information retrieval work
• Data engineering experience
• IR fundamentals: BM25, TF-IDF, and neural retrieval
• Evaluation: comfortable with NDCG, MRR, Precision@K and when to use each
• Data & software: Python (asyncio, type hints, pandas) and strong SQL (modeling, window functions, CTEs, optimization)
• Production APIs: design, implementation, and maintenance

Nice to have

• Ranking systems: learning-to-rank, re-ranking, relevance tuning
• Distributed compute / orchestration: Spark, Ray, or Temporal
• Search engines: Elasticsearch / OpenSearch at scale
• Warehouses: BigQuery, Snowflake, or similar
• Post-training LMs for retrieval/ranking

What they offer

• High impact & growth: Shape strategy at a scaling AI startup from day one
• Mission-driven culture: Ambitious team valuing first-principles thinking and bold ideas
• Competitive compensation: €80-€120k salary plus significant equity
• Personal development: Learning budget for courses and conferences
• Startup perks: Flexible vacation, team lunches, retreats, central Berlin office