Fullstack Engineer (AI)

TL;DR

Fullstack Engineer (AI): Owning and shipping end-to-end product features across the full stack for an AI safety company with an accent on architecture and implementation to deployment and iteration. Focus on turning complex AI capabilities into accessible, reliable products.

Location: Work from Paris (hybrid) + relocation package to France.

Salary: $80,000 to $150,000 + equity

Company

White Circle is an AI Safety company building the safety, reliability, and optimization layer for AI systems.

What you will do

• Own and ship end-to-end product features across the full stack, from architecture and implementation to deployment and iteration.
• Design intuitive, high-quality user experiences, building seamless flows from onboarding to advanced analysis.
• Collaborate closely with founders, product, design, ML, and research to turn complex AI capabilities into accessible, reliable products.
• Drive the full development lifecycle and contribute to technical direction, product strategy, and engineering culture.

Requirements

• Know your way around TypeScript, React, Next.js, Tailwind.
• Have worked with LLMs (OpenAI API, function calling, context management — you get it).
• Can write non-trivial SQL without Googling “group by in window function explained.”
• Care about design, usability, and performance, not just “making it work.”

Culture & 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