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

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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

How we hire

— Intro call with HR (20 min)

— Take-home test task

— Technical interview with QA Engineer (1h)

— Final call with our CEO & Head of Engineering (45 min)