Senior Data Engineer

6 Month Contract, Outside IR35, ASAP Start Date, 2x times on site per week. We’re hiring a Data Engineer to join a large, community-driven marketplace used by millions of buyers and sellers every day. You’ll play a key role in modernising the data platform that supports recommendations, trust and safety, operational insights, and high-volume event processing. This role is heavily focused on building scalable data pipelines, strengthening data quality, and supporting a shift toward a full lakehouse and Medallion architecture. You’ll be working closely with backend teams, so previous experience as a Scala developer is required. ]What you’ll work on: • Migrating existing SQL-based workflows into Spark ETL pipelines on Databricks • Designing and evolving Medallion data models (bronze, silver, gold layers) • Building and maintaining Airflow DAGs for orchestration • Creating reliable ingestion and transformation pipelines across AWS • Translating and integrating backend Scala models into data engineering workflows • Improving performance, observability, and reliability of the data platform