TLDR: We’re looking for a QA Engineer to help us build reliable, scalable testing infrastructure. You’ll work with Playwright, Python, and CI/CD pipelines to own end-to-end quality across our platform, improve test reliability and speed, and help shape engineering quality standards.

About us

White Circle 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.

You will:

Design, build, and maintain end-to-end test automation frameworks for our web platform and APIs
Own test coverage for new features
Integrate automated test suites into CI/CD pipelines
Write clear, reproducible bug reports and work closely with engineers to get them resolved
Build exploratory and regression test plans for each release cycle
Improve test reliability & speed
Help the team develop a quality mindset: review testability in design, flag risks early

You’ll fit right in if you:

Have 2+ years of QA automation experience & you’ve built frameworks from scratch
Have experience with Playwright for end-to-end UI testing and know how to structure scalable test suites
Write clean automation code in Python (pytest, fixtures, parametrize)
Have plugged automated tests into CI/CD pipelines (GitHub Actions, GitLab CI, or similar)
Communicate clearly and work well with others & have fluent English
Have experience working with AI coding agents and LLM-powered developer tools, and understand how to use them effectively to improve productivity and testing workflows
Are curious, proactive, and eager to learn new things: you ask questions, think critically, and constantly look for ways to improve and optimise existing processes and solutions

A big plus:

Experience testing AI or LLM-based products, handling non-deterministic outputs, confidence scoring, edge-case prompts
Familiarity with performance or load testing (k6, Locust)
Experience with Postman, Insomnia, Yaak or API contract testing
Background in security-aware QA or SOC 2 environments

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