Data Scientist Engineering Paris Full-time · Permanent

Kleep; Paris; Hybride; EUR 70 000 - 100 000; Plein temps

Avantages offerts par ce poste

Office in Paris (9th arrondissement)

International team

Résumé du poste

Kleep is building the intelligence layer for fashion e-commerce, turning data into sharper recommendations used by 300+ brands. You will work with a senior team in Paris and New York to productionize models and prove gains through live A/B tests, taking ideas from hypothesis to shipped product.

The role demands curiosity, rapid learning, and the ability to own end-to-end ML lifecycle within an entrepreneurial environment. CDI, full-time, based in Paris (9th arrondissement).

Qualifications

• Turn data into product by building production-ready models for fashion e-commerce.
• 3+ years of experience in data science / ML roles.
• Comfort turning hypotheses into shipped analytics and models.

Responsabilités

• Improve the models behind sizing and discovery recommendations.
• Design and analyze live A/B tests to prove improvements on client traffic.
• Turn product and client questions into analyses that ship in the product.
• Own the full lifecycle of your models, including quality, accuracy and performance.

Connaissances

Data modeling

Experiment design

A/B testing

Production ML

Python

Outils

Python

AWS

Git

Jira

Shopify

Description du poste

Turn data into product at the core of Kleep, working directly with the CTO from first idea to production.

You will turn Kleep's data into sharper recommendations: modelling morphology, garment fit and shopper behaviour, and proving every improvement in live A/B tests, working directly with the CTO.

It suits a scientist who wants their models in production in front of millions of shoppers, not in notebooks, with the scope to take an idea from hypothesis to shipped product.

The stack

You do not need to know all of it on day one.

• Front-end: TypeScript, React
• Back-end: Node.js, Python
• Cloud: AWS
• Tooling: Git, Jira
• A plus: the major commerce platforms (Shopify, SFCC, Prestashop)
• Also a plus: Kotlin or Swift

What you will do

• Improve the models behind Kleep's sizing and discovery recommendations
• Design and analyze the A/B tests that prove every improvement on live client traffic
• Turn product and client questions into analyses that ship in the product
• Own the full lifecycle of your models: quality, accuracy and performance included

Who you are

• Passionate about technology, curiosity is one of your defining strengths, and complex problems are what you enjoy
• A fast learner who quickly identifies and acquires whatever skill the goal requires
• High energy, high intellectual horsepower
• Eager to take a leading role in an ambitious entrepreneurial venture
• A strong team player who operates with real autonomy
• 3+ years of experience
• Start date: as soon as possible (flexible)
• Contract: permanent, full-time (CDI)
• Location: Paris (9th arrondissement)

Why Kleep

Kleep builds the intelligence layer for fashion e-commerce: sizing, discovery and AI imagery that 300+ brands run in production, Givenchy, Lacoste and Victoria Beckham among them. Every product is proven in live A/B tests, not in decks.

We are a small, senior, international team with offices in Paris (9th arrondissement) and, since January 2026, New York. The company is led by its founders: Federico (CEO, previously in venture capital and private equity) and Théophile (CTO, an ENS and Mines Paris engineer who worked in trading and quantitative research at Morgan Stanley and BNP Paribas).

Ownership here is real: ideas are heard, feedback flows both ways, and impact is tangible from day one. We hold a high bar, celebrate together, weekly team drinks, monthly events, annual off-sites, and stay serious about the work, never about ourselves.