QA Engineer (Manual + Automation)

TLDR: We’re looking for a hands-on QA Engineer to own product quality across our rapid release cycles. You’ll spend most of your time manually testing new features and fixes across our web platform and APIs: exploring edge cases, identifying risks, running focused regression checks, and giving the team fast, clear feedback. You’ll also automate stable, high-value scenarios using Playwright and Python, helping us make repeatable testing faster and more reliable. This is a manual-first product QA role where automation is an important tool, not the entire job.

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

Manually test new features and fixes throughout frequent and short (sometimes as short as a working day) release cycles

Quickly understand product changes, identify the highest-risk areas, and provide clear release feedback

Perform exploratory, smoke, regression, and integration testing across our web platform and APIs

Create concise, practical test plans and checklists for new features and releases

Investigate unexpected behaviour, isolate root causes, and write clear, reproducible bug reports

Work closely with engineers and product owners to clarify requirements and improve testability before development is complete

Build, maintain, and integrate automated tests for stable/business-critical flows into CI/CD, improving reliability and speed

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

Competitive compensation package, including equity

Flexible time off

Paid time off in line with your local regulations, no matter where you work from

Work from Paris or London (hybrid) + relocation package for Paris

Best medical insurance in France

Learning and development support for courses, conferences, and opportunities to grow your skills

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

Process

Intro call with HR (20 min)

Take-home test assignment

Technical interview with QA Engineer (1h)

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

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