Senior Frontend Engineer
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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
Visualization: @observablehq/plot, d3, in-house graph library
i18n : react-intl + FormatJS, workflow English/French
Backend interfacing: Hono, Drizzle, OpenAuth
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
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