Product Engineer, Backend (Rust)
Npv · Paris
What this role requires
2 requirements, read out of the advert rather than guessed from the job title:
Also mentioned, not required: Python, Go, Tokio, Axum, Actix, ClickHouse, Redis, Kafka, English (B2). Worth having, but their absence is not what gets a CV filtered out.
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Job description
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.
Read the full description (14 more sections)Show less
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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