This role has closed. Npv has taken the posting down.
hirly last saw it live on 8 September 2026. See similar open roles below, or browse all jobs in Paris.
Npv
Product Engineer, Backend (Rust)
Paris
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hirly's read of this role
- Seniority
- Mid level
- Stated salary
- $80,000 – $150,000 per year
- Country
- FR
- Work mode
- On-site / unstated
- First seen by hirly
- 6 Sept 2026
Derived automatically from the posting.
the posting
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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