Software Engineer, Data & AI Platform

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.

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
• 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
• Data engineering experience

What they offer

• High impact & growth: Shape strategy at a scaling AI startup from day one
• €80-€120k salary plus significant equity
• Learning budget for courses and conferences
• Flexible vacation, team lunches, retreats, central Berlin office