We're looking for a Product Engineer, Backend (Rust) to join White Circle , an AI Safety company building the policy enforcement and optimization layer for AI systems. Backed by $11M from senior leaders at OpenAI, Anthropic, HuggingFace, Mistral, and DeepMind, White Circle processes 100M+ API calls monthly and runs its own LLMs in production.
You will
• Design and build Rust backend services handling real-time policy checks at scale.
• Own features end-to-end – API design, schema, deployment, monitoring.
• Improve performance and reliability through connection pooling, caching, query optimization, and observability.
• Collaborate directly with product and research.
Requirements
• Production experience with Rust, Python, or Go.
• Comfortable with async Rust (Tokio), Axum/Actix, and PostgreSQL – schema design, query optimization, debugging.
• Strong system design fundamentals: trade-offs, failure modes, scaling.
• Relocation to Paris or London (hybrid) required.
Stack
• Rust, Tokio, Axum/Actix, PostgreSQL.
• Bonus: ClickHouse, Redis, Kafka, LLM infra (routing, inference, RAG), or high-throughput monitoring background.
We offer
• $80k–$150k/year salary + equity; higher figures can be negotiated.
• Official employment, visa and relocation help.
Compensation: $80K – $150K • Higher figures and equity are negotiable
• • $80K – $150K • Higher figures and equity are negotiable
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