Product Engineer, Backend (Rust)

Npv · Paris · Hybrid

• Employment typeFull-time
• Experience levelMid level
• Salary signalSalary not listed
• Last checked25 days ago
• Source valid throughOct 6, 2026

Role Overview

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 Find Jobs in France on Arbeitnow

Why It Matches

This full-time role is listed as hybrid in Paris. The source does not expose a salary range, so confirm compensation before investing in a long application. The match score reflects role clarity, work mode, location, freshness, salary visibility, and description depth—not a promise that the employer will select a candidate.

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