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Arlequin AI

Arlequin AI develops an AI platform that analyses relationships between heterogeneous data and traces their sources. It serves governments and large organisations making complex decisions from fragmented data.

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Fullstack Engineer

  • Permanent
  • Paris, Paris
  • Other
  • Published 13/09/2026

Arlequin AI recherche un ingénieur fullstack à Paris pour contribuer aux pipelines backend et aux interfaces frontend de sa plateforme IA. Le poste utilise notamment TypeScript, React, Node, PostgreSQL et Python, avec une présence sur site et une rémunération incluant une participation au capital.

Information about Arlequin AI
Sector
Software and internet
Model
B2B
Stage
Startup early-stage
Headquarters
Paris
Official domain
arlq.ai
Published headcount
50 employees
Total funding published
32,4 €Source ↗
Latest funding round
Series A · 2026-09-10
Amount announced
28 €
Open jobs
8

Investors mentioned

  • OTB Ventures
  • Redalpine
  • 10x Founders
  • Bpifrance
  • Vsquared Ventures

Job details

The full description published by Arlequin AI.

View original job listing ↗

Description de l’offre

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ENGINEERING

Fullstack Engineer

Contribute to both sides of our platform: ingestion pipelines and data processing on the backend, exploration and analysis interfaces on the frontend.

1–5 YEARS OF EXPERIENCE

FULL-TIME

ON-SITE IN PARIS

About Arlequin

Arlequin is building the sovereign European alternative to Palantir: an AI platform capable of processing massive data volumes without bias, with high-impact use cases such as fighting disinformation. Founded in late 2024 by Hugo Micheron (researcher in geopolitics and systemic risk) and Antoine Jardin (CNRS research engineer).

The role

You’ll join a team of around ten people to contribute to both sides of the platform — ingestion pipelines and data processing on the backend, exploration and analysis interfaces on the frontend. Our product (HUDEX) enables non-technical analysts to interpret narrative dynamics across large-scale digital ecosystems. You’ll work alongside senior engineers who mentor you on architecture, and you’ll quickly take ownership of complete features from end to end.

Stack

Frontend: React 19, TypeScript, Tanstack Router + Query, Vanilla Extract CSS

Backend: Hono, Node 24, Drizzle ORM, PostgreSQL, OpenAuth Build & infra: monorepo npm workspaces + Turbo, Vite, Docker, Azure Container Registry

Data : Python

Tests & quality: Jest, ESLint, Prettier, strict TypeScript

What we’re looking for

1–5 years of fullstack experience

Strong command of TypeScript and a modern React ecosystem

Comfortable with a Node backend and ORM (Drizzle, Prisma or equivalent)

A desire to understand architectural choices, not just execute

Professional English

Bonus

Already comfortable in a startup environment

Mastery of agentic coding tools and code models

Exposure to Python / AI

Experience with harness coding / implementation

Interest in emerging tools and paradigms

Fast learning on TypeScript codebases

Process (~2 weeks)

Screening (15 min)

Fit interview (30 min)

Technical interview (1h)

Founder culture fit (45 min)

Reference calls

Offer

Package

Competitive compensation including equity stake

On-site central Paris

Requirements

  • Strong command of TypeScript and a modern React ecosystem
  • Comfortable with a Node backend and ORM
  • A desire to understand architectural choices

Benefits mentioned

  • equity stake

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