Product Engineer, Backend

Job not on LinkedIn

🕒 February 26

🏢🏡 Paris – Hybrid

💵 $80k - $150k / year

⏰ Full Time

🟡 Mid-level

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 55%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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White Circle

WebsiteLinkedInAll Job Openings

1 - 10 employees

🤖 Artificial Intelligence

🔌 API

🔐 Security

Artificial Intelligence • API • Security

White Circle is a unified control layer for AI applications that helps teams test, protect, observe, and optimize model-driven features. The platform provides automated red-teaming, low-latency guardrails, input/output protection (PII detection, jailbreak prevention, hallucination detection, data-leak prevention), analytics and custom metrics (risk scoring, user-behavior clustering), and optimization tools like dynamic prompts and model routing. Delivered via a high-throughput API with enterprise-grade security (SOC 2, HIPAA), White Circle targets organizations deploying AI at scale.

📋 Description

• Design and build backend services in Rust that handle real-time policy checks at scale – low latency, high reliability. • Own features end-to-end: from API design to database schema to deployment. You ship, you monitor, you iterate. • Work across the stack when needed – we care more about solving problems than role boundaries. • Improve system performance and reliability – connection pooling, caching strategies, query optimization, observability. • Collaborate directly with product, research, and ML teams to turn requirements into production systems.

🎯 Requirements

• You've built and shipped backend systems in Rust – not just tutorials, real production services. • You're comfortable with async Rust (Tokio), web frameworks (Axum, Actix), and database access patterns. • You have strong fundamentals in system design – you can reason about trade-offs, failure modes, and scaling. • You've worked with PostgreSQL and know how to write efficient queries, design schemas, and debug performance issues. • You communicate clearly and work well with others. Fluent English.

🏖️ Benefits

• 20 days of paid vacation • Best medical insurance in France • All the hardware, tools, and services you need • Covered subscriptions for AI agents and IDEs • Team off-sites twice a year: we’ve recently been to the Alps and to Saint-Tropez