Product Engineer (Backend)

Навыки

• API (интеграции)
• ClickHouse
• Datadog / New Relic
• Kafka
• LLM
• Мониторинг и observability
• PostgreSQL

О компании и продукте

• 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

Задачи

• 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 to turn requirements into production systems
• YOU’LL FIT RIGHT IN IF YOU
• You've built and shipped backend systems in Rust, Python or Go
• 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
• Experience with LLM infra, including LLM routing, inference systems, and RAG architectures
• Background in high-throughput monitoring systems, fintech
• WHY WHITE CIRCLE
• Meaningful equity package
• 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

Как проходит отбор

• Intro call with one of our colleagues
• Show your best during the technical interview
• Final call with our CEO and Head of Engineering
• Please submit your application in English

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