Senior Data Engineer – AI Security Evidence Store

About the role

Refractal is an AI security company building the infrastructure organisations need to defend against autonomous AI threats. You will build its data foundation, including the evidence store that customers' auditors rely on, the analytics behind compliance reporting and the datasets used to train the company's models.

Key responsibilities

• Design the data model for the append-only, cryptographically signed evidence store.
• Build the streaming and batch layer that turns ingested activity and detections into queryable data.
• Own data quality, retention, residency and deletion controls for regulated customers.
• Build training and evaluation datasets with data scientists and security researchers.
• Make compliance reporting against the EU AI Act, NIST AI RMF and ISO/IEC 42001 quick to produce from the data.

Required profile

• 6+ years in data engineering, owning production pipelines.
• Data modelling for audit trails, lineage and multi-tenant isolation.
• Security-minded handling of sensitive data.
• Nice to have: Google Cloud experience, data work in regulated industries, Montenegrin, Serbian, Bosnian or Croatian.

Required skills

• Strong Python and SQL, with Postgres plus a warehouse or analytics store such as BigQuery or ClickHouse.
• Streaming (Kafka, Pub/Sub or similar) and orchestration (Airflow, Dagster or similar).

What we offer

• Salary of EUR 35,000 to 80,000 gross per year.
• Competitive equity, pension contribution, private medical and dental cover.
• Visa and relocation support.