Fullstack Engineer

Contribute to both sides of HUDEX: 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).

~30 people, post-seed, Series A in progress. On-site in Paris.

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

Backend: Hono, Node 24, Drizzle ORM, PostgreSQL, OpenAuth

Build & infra: monorepo npm workspaces + Turbo, Vite, Docker, Azure Container Registry

Data : Python

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

On-site central Paris