Product Engineer (Backend)
- Type
- Job
- Organization
- Npv
- Location
- Paris
- Deadline
- Rolling or not stated
- Who can apply
- On-site in Paris
- Posted
- 6 October 2026
- Skills mentioned
- Rust, Python, PostgreSQL, Redis, Kafka
About this Opportunity
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 willDesign and build Rust backend services handling real-time polic
Documents you may need
- Updated CV / Resume
- Cover Letter (tailored to this role)
- English Language Certificate (IELTS/TOEFL)
How to apply
- Click the "Apply — via Arbeitnow" button to go to the source page.
- Read the full description and confirm you meet the requirements.
- Prepare your CV and cover letter tailored to this role.
- Submit your application through the official portal.
- Follow up within 1–2 weeks if you do not hear back.