Founding Engineer

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

Résumé du poste

Niulix is seeking a founding engineer to own the most critical backend systems across platforms used by 150k+ users, including B2C, B2B and mobile apps.

You will oversee anti-fraud, automated QA, and high-volume payout workflows, maintain scalable architecture, and ship fast with reliability.

Required: a proper prépa, a full 3-year engineering degree from top institutions (Polytechnique, Centrale, Mines, ENS or Paris-Saclay), plus French-speaking.

Qualifications

• Required: completed proper prépa and a full 3-year engineering degree from top schools.
• French-speaking (mandatory).
• Fully AI-native workflow: orchestrates multiple agents/tasks in parallel (3-4 windows).
• Proactive communicator who surfaces problems and ideas immediately.
• Hands-on agentic coding ability using modern agentic tools as core workflow.

Responsabilités

• Own critical backend systems across platforms used by 150k+ users.
• Oversee anti-fraud and automated QA systems and ensure delivery quality.
• Maintain heavy backend architecture and scalable ops.
• Manage payout systems handling daily high volumes across 100+ countries.
• Live production support for top AI clients with hard deadlines and specs.

Connaissances

Proactive communicator

Hands-on coding

French-speaking

Formation

Prépa (2-year preparatory class)

Engineering degree (top school)

Outils

Claude Code

Codex

GStack

Hermes-style agent frameworks

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