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Arlequin AI

Arlequin AI développe HuDex, une plateforme d’analyse de données multilingues et non structurées, et mène des travaux de recherche en apprentissage profond topologique. Ses outils s’adressent aux entreprises et aux organismes publics.

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Senior Frontend Engineer

Am I a fit — voir ma compatibilité
  • Stage
  • Paris, Paris
  • Autre
  • Publiée 13/09/2026

Arlequin AI recherche un Senior Frontend Engineer pour concevoir des interfaces d’analyse et des visualisations de données complexes à Paris. Le poste implique React, TypeScript et D3, avec une collaboration étroite avec les équipes produit et engineering. Une expérience d’au moins cinq ans en frontend, dont deux sur des produits orientés données ou des interfaces complexes, est demandée.

Repères sur Arlequin AI
Secteur
Logiciels et Internet
Modèle
B2B
Siège
Paris
Domaine officiel
arlq.ai
Dernière levée
Série A · 2026-09-01
Montant annoncé
31 000 000 $
Offres ouvertes
10

Investisseurs mentionnés

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

Détails de l’offre

La description complète publiée par Arlequin AI.

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Description de l’offre

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Product engineering

Senior Frontend Engineer

Own the quality of the user experience: analysis interfaces, complex data visualizations and cross-product frontend patterns.

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 own the quality and consistency of the user experience across the HUDEX platform — analysis interfaces, complex data visualizations (knowledge graphs, time series, narrative dynamics), user journeys for creating projects and data collections. Our users are non-technical analysts handling massive datasets and AI outputs: interface quality is one of the key factors that makes the difference between contracts that renew and those that don’t. Your business impact is direct.

You’ll work hand in hand with product and a future senior Product Designer, represent the frontend voice in architecture decisions alongside the Head of Engineering, and progressively take ownership of the design system and cross-product patterns.

Stack

Core : React 19, TypeScript, Tanstack Router + Query

UI & styling: Mantine, Vanilla Extract

Visualization: @observablehq/plot, d3, in-house graph library

i18n : react-intl + FormatJS, workflow English/French Build: Vite, Turbo monorepo

Backend interfacing: Hono, Drizzle, OpenAuth

Quality: ESLint, Prettier, Jest, strict TS

What we’re looking for

5+ years of frontend experience, including at least 2 on data-driven products or complex interfaces

Strong command of React and its modern ecosystem

Real product and UX sensitivity — able to challenge a design to make it better

Experience with data visualization (D3, graph libraries, Plot, or equivalent)

Professional English

Bonus

Ownership of, or significant contribution to, a design system

Early/mid-stage startup experience

Mastery of agentic coding tools and code models

Interest in emerging tools and paradigms

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

Prérequis

  • Strong command of React and its modern ecosystem
  • data visualization
  • product and UX sensitivity

Avantages mentionnés

  • equity stake

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