Staff Frontend Engineer
Full Job Description
About Lexsi Labs
Lexsi Labs is a frontier AI lab working toward aligned, interpretable and safe superintelligent systems. Our near-term mission is to build safety-aware autonomous systems for mission-critical settings such as banking, insurance, government and healthcare.
We operate with a flat structure, high autonomy, and a strong bias toward engineers who take full ownership of what they build, from architecture to production behaviour.
About the Role
We are building the platform through which institutions own the AI they depend on. Post-training, alignment, evaluation, deployment and monitoring run inside the customer's own environment, on the methods our labs publish.
The interface decides whether frontier model science stays in research papers or becomes something every institution can operate.
What you'll work on
- Own the frontend architecture of a large React and TypeScript application: routing and layout, code splitting, state boundaries, and the contracts between the UI and backend services.
- Own the component library and design tokens as a single system used across the application, evolving it incrementally in a live codebase without pausing feature work.
- Design and build data-dense interfaces: virtualised tables over large result sets, live metrics and log streams, trace and graph visualisations, side-by-side comparisons, and code and configuration editors.
- Build a real-time data layer over SSE and WebSockets with reconnection, backpressure and cache semantics that stay consistent with request-response queries.
- Build schema-driven form systems for deeply nested, conditional configuration, validated against backend schemas.
You may be a good fit if you have
This is a hands-on individual contributor role. You will write production React and TypeScript most of the week, own the frontend architecture of the platform, and make the final call on its flows, information architecture and visual design.
- 8+ years building production web applications, including several years as the technical lead on a complex product UI.
- Expert-level TypeScript and React, including React 19 rendering and concurrency behaviour and hands-on performance profiling.
- Led an incremental migration in a live application, such as a component library, state management approach, router or build system.
Company
AryaXAI
AryaXAI is a frontier AI lab dedicated to building aligned, interpretable and safe superintelligent systems for mission-critical sectors including banking, insurance, government and healthcare.The com...