Data Engineer

TLDR: We’re looking for a Data Engineer who can design and build our data pipelines from scratch – handling petabytes of logs, events, and model traces – and create a clean, reliable environment for production, testing, and research workloads.

ABOUT US

White Circle https://whitecircle.ai is an AI Safety company building the safety, reliability, and optimization layer for AI systems. At the core of our platform are policies – simple natural-language rules that define what an AI model should and shouldn’t do. We automatically test, enforce, and continuously improve these policies at scale.

• We’ve raised $11M from top funds, founders, and senior leaders at OpenAI, Anthropic, HuggingFace, Mistral, DeepMind, Datadog, Sentry, and others
• We process over one hundred million API calls every month
• We fine-tune and train our own LLMs so they run faster and cheaper than any open or proprietary model

We’re a small, highly focused team. If you want to work deeply on hard problems, see your work ship to production quickly, and influence how AI safety is actually built – you’re the one we need.

WHAT YOU’LL DO

• Own and evolve our internal data tooling.
• Scrape external sources, turn raw chaos into structured datasets, and keep them fresh and reliable.
• Build and maintain pipelines to transform and version data, ensuring quality through testing and monitoring.
• Create new data products that directly address business needs.
• Diagnose and fix pipeline issues before they become someone else’s problem.
• Ship analytics and dashboards that people actually use.
• Jump into data and infra tasks where needed and make things more robust.

WHAT WE’RE LOOKING FOR

• You’re strong in Python and SQL and comfortable working with messy, real-world data.
• You have solid experience with web scraping and know how to make pipelines reliable, monitored, and resilient.
• You’ve worked with PostgreSQL (or similar) and understand how to structure and query data efficiently.
• You’ve worked with a cloud data warehouse (ClickHouse, BigQuery, Redshift, Snowflake, etc.).
• You’re a builder: you fix things, improve systems, and don’t wait for perfect specs.

You communicate clearly and can work in English.

NICE TO HAVE / BIG PLUS

• Experience with Metabase or similar BI tools.
• Experience versioning datasets and building lightweight data pipelines.
• Experience with dbt for data modeling / analytics engineering.
• Familiarity with ETL tools (Fivetran, Airbyte, dltHub, etc.).
• Experience with AWS (Athena, Glue, S3, etc.).
• Experience with AI-assisted or agentic coding.

WHY WHITE CIRCLE

• Paid time off in line with your local regulations, no matter where you work from
• Work from Paris (hybrid) + relocation package
• Best medical insurance in France
• All the hardware, tools, and services you need
• Covered subscriptions for AI agents and IDEs
• Team off-sites twice a year: we’ve recently been to the Alps and to Saint-Tropez

HOW WE HIRE

1. Intro call with one of our colleagues
2. Complete the take-home exercise
3. Show your best during the technical interview
4. Final call with our CEO and CTO

Please submit your application in English - it’s our company language so you’ll be speaking lots of it if you join