Founding Engineer

Niulix; Lyon; Sur place; EUR 90 000 - 140 000; Plein temps

Résumé du poste

Niulix is seeking a founding engineer to own critical systems across multiple platforms serving 150K+ users and overseeing live production.

You will tackle anti-fraud, automated QA, and a heavy backend as we scale to 1M+ users and daily payout flows across 100+ countries. The ideal candidate completed a prépa plus a 3-year engineering degree from top schools; French-speaking is mandatory.

Qualifications

• Requires a proper prépa and a 3-year engineering degree from top French schools.
• French-speaking is mandatory.
• Hands-on coding with modern agentic tools as core workflow.
• Proactive communicator who surfaces problems and ideas quickly.

Responsabilités

• Own and operate critical systems across multiple platforms serving 150K+ users.
• Own quality of anti-fraud and automated QA systems.
• Maintain heavy backend architecture for scale to 1M+ users.
• Oversee payout systems moving daily across 100+ countries.
• Live production serving top AI companies with hard deadlines.

Connaissances

Agentic coding

Proactive communicator

Strong problem-solving

French language

Formation

Prépa

Engineering degree

Description du poste

As a founding engineer you own some of the most critical systems in the company.

• Multiple platforms with 150K+ users collecting data: B2C, B2B, mobile app, internal.
• Anti-fraud and automated QA systems. You own the quality of what we deliver every day.
• Heavy backend, keeping architecture and ops efficient as we scale to 1M+ users.
• Payout systems moving daily high volumes of money across 100+ countries.
• Live production serving multiple top 5 AI companies, hard deadlines and specs.

Required

Completed a proper prépa (2-year preparatory class) AND a full 3-year engineering degree at Polytechnique, CentraleSupélec, Les Mines, ENS, or Paris-Saclay

French-speaking (mandatory)

Fully AI-native workflow: orchestrates multiple agents/tasks in parallel (3-4 windows)

Proactive communicator, not introverted — surfaces problems/ideas immediately

Hands-on agentic coding ability: modern agentic tools (Claude Code, Codex, GStack, Hermes-style agent frameworks) as core workflow