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Product Engineer

White Circle · France · Senior · Hybrid · USD 80k - USD 150k

About White Circle

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.

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About the Role

We're looking for a Product Engineer (Backend – Rust) to own and evolve the core systems that power AI safety at scale – building APIs that handle hundreds of millions of requests, real-time policy enforcement, and high-throughput data pipelines.

Key Responsibilities:

Design and build backend services in Rust that handle real-time policy checks at scale – low latency, high reliability.
Own features end-to-end: from API design to database schema to deployment. You ship, you monitor, you iterate.
Work across the stack when needed – we care more about solving problems than role boundaries.
Improve system performance and reliability – connection pooling, caching strategies, query optimization, observability.
Collaborate directly with product, research, and ML teams to turn requirements into production systems.

Requirements:

You've built and shipped backend systems in Rust – not just tutorials, real production services.
You're comfortable with async Rust (Tokio), web frameworks (Axum, Actix), and database access patterns.
You have strong fundamentals in system design – you can reason about trade-offs, failure modes, and scaling.
You've worked with PostgreSQL and know how to write efficient queries, design schemas, and debug performance issues.
You communicate clearly and work well with others. Fluent English.

A big plus:

Experience with ClickHouse, Redis, or Kafka/event streaming
Kubernetes and infrastructure-as-code (Terraform, Helm)
Background in high-throughput systems monitoring systems, fintech

Why White Circle

Salary of $80,000 to $150,000 + equity
20 days of paid vacation
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 one of our colleagues
Complete the take-home exercise
Show your best during the technical interview
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

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