LEAD SWE

Station F; Paris; Hybrid; EUR 80,000 - 100,000; Full time

Benefits offered by this job

Alan health insurance (mutuelle)

50% Navigo covered

Job summary

Ooak Data à Paris recherche un Lead Software Engineer pour piloter une squad de 4 à 6 ingénieurs sur l’ingestion, l’anonymisation et le traitement des données, ou sur QA et livraison. Le poste rapporte au CTO Thomas et s’inscrit dans la construction d’une plateforme IA-native robustes et évolutive.

Vous intervenez en codant, en guidant l’architecture et en gérant les priorités, les rituels et la croissance des talents.

Qualifications

• 10+ années d’expérience en développement logiciel et architecture.
• Gestion d’équipes techniques de 4 à 6 personnes dans un environnement startup ou scale-up.
• Maîtrise du back-end avec Python ou Rust et pipelines distribués.
• Connaissance de SQL, data warehouses et outils cloud (GCP ou équivalent).
• Approche IA-native et expérience avec des agents de codage est un plus.

Responsibilities

• Conduire une squad end-to-end: ingestion, anonymisation, traitement, ou QA & delivery.
• Piloter la livraison, qualité et fiabilité du pipeline d’écosystèmes de données.
• Coder soi-même et encadrer l’équipe, avec développement et revue de code.
• Définir l’architecture technique avec les leads et le CTO.

Skills

Ingénierie logicielle

Gestion équipes (4-6)

Back-end profond

Python et Rust

SQL et pipelines distribués

Cloud (GCP)

IA / agents codants

Anglais courant

Tools

Airflow

Dagster

Job description

About

We're Ooak Data

Ooak Data turns company data into training data for AI agents.

Frontier labs can train models to reason. They cannot train them to work: navigating a real company's Slack threads, half-finished Notion docs, contradictory Jira tickets, and permission boundaries. That requires real enterprise data, and you cannot synthesize it. You have to source it.

We plug into enterprise tools, anonymize everything into a structurally identical digital twin, and generate reinforcement-learning environments with expert-level tasks calibrated against frontier models.

We are a Y Combinator company with 8 figures contracts signed with frontier AI labs, and we are scaling delivery aggressively over the next months.

Our values

• Trust, the foundation of every relationship, internal and external. We extend it by default and value the ownership that comes with it.
• Ambition, we commit, we move fast, with tenacity and efficiency.
• Collective, team first, low ego.
• Kindness, at the heart of every interaction.

Job Description

Your missions

As Lead Software Engineer, you lead one of our product squads end to end: ingestion, anonymization & processing, or QA & delivery. You report to Thomas (CTO & co-founder).

• Own your squad's delivery. Your squad ships a core part of the pipeline that turns full company data ecosystems into digital twins for the labs. Volumes, quality and reliability are yours.
• Stay hands-on. You code, take on hard problems yourself and review a large share of the code. You lead by example: this is not an organization and reporting role.
• Manage your squad. You lead 4 to 6 engineers, some of them very senior. You quickly take over their day-to-day management from Thomas: priorities, 1:1s, feedback, career growth and reviews. You also hire and onboard the next ones.
• Shape the technical direction with Thomas and the other leads: stack, infrastructure, data architecture, code quality, testing, observability, and AI-native development practices.
• Work hand in hand with product and ops: our delivery and run are embedded in the build, priorities move fast.

Concretely, Over Your First 12 Months

• Ship at scale: the pipeline has to absorb hundreds of company data ecosystems over the next year, reliably and with auditable quality.
• Build the squad with the founders: interviewing, closing, onboarding.
• Structure the way your squad works: rituals, documentation, on-call, and how it collaborates with the other squads.

Preferred Experience

Who we're looking for

• 10+ years in software engineering, including 3+ years managing engineers (teams of 4-5 people or more, including senior profiles).
• Strong back-end depth on data-intensive systems: Python or Rust in production, SQL, distributed pipelines, cloud infrastructure (GCP or equivalent).
• AI-native way of building: you have been building with coding agents every day for months, and you know how to make a team ship faster and safer with them. At Ooak, every engineer runs several Claude Code sessions in parallel.
• A track record of shipping in a demanding, fast-moving environment: start-up or scale-up.
• High bar on quality and security: we handle our partners' most sensitive data.
• Team first, low ego: you lead by clarity and trust, and you make the people around you better.
• Fluent English, mandatory (working language with our clients and the labs).

The extras that make the difference

• Experience with data engineering at scale: ETL/ELT, orchestration (Airflow, Dagster, etc), warehouses and lakes.
• Experience with data anonymization, privacy, or security-sensitive systems.
• Strong interest in AI, RL environments, and how frontier models are trained.
• TypeScript on the side, for the platform.

Why join us

• Entrepreneurial adventure: founding impact, live the early days of an ambitious company at the front line of the AI revolution.
• Backed by Y Combinator, join just as we accelerate.
• Offices in central Paris.
• Perks: Alan health insurance (mutuelle), 50% Navigo covered.

Recruitment Process

Recruitment process

We move fast.

• A 30 min intro call with Grégoire (co-founder)
• A 60 min technical deep dive with Thomas (CTO & co-founder): your track record, technical judgment, how you lead
• A technical case, presented to Thomas and a tech member
• A final fit interview with 2 founders
• Reference calls

Additional Information

• Contract Type: Full-Time
• Location: Paris
• Occasional remote authorized
• Salary: between 80000€ and 100000€ / year