Product Engineer (Backend)
Executive Mandate Specification
We're looking for a Product Engineer, Backend (Rust) to join White Circle, an AI Safety company building the safety, reliability, and optimization layer for AI systems through natural-language policies it automatically tests, enforces, and improves at scale. Backed by $70M (Series A) from top funds and senior leaders at OpenAI, Anthropic, HuggingFace, Mistral, DeepMind, and others, White Circle processes 100M+ API calls monthly and fine-tunes and trains its own LLMs to run faster and cheaper than open or proprietary models.
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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Statutory Executive Benefits & Governance
- Executive Health, Vision & Dental Coverage with Global Provider Options
- Corporate Pension Auto-Enrolment / 401(k) Retirement Plan with Fiduciary Matching
- Annual Discretionary Performance Incentive & Long-Term Equity Participation
- Executive Leave Allotment, Statutory Holidays & Dedicated Health Care Reserves
- US Department of Labor & E-Verify Work Authorization Sponsorship