Senior UX Engineer — AI UI & Frontend Mastery

Perceptic; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Perceptic is building the AI operating system that powers drug discovery. Senior UX/Design Engineer works at the seam between design and engineering, roughly 80% frontend, 20% backend, and you design in code rather than waiting for a final spec.

Our users are scientists making high-stakes decisions on AI reasoning; the interface decides whether they trust the results. You will own the look and feel end-to-end, surface provenance and confidence, and contribute to a design system while shipping

Qualifications

• At least 4 years of professional engineering experience, frontend-heavy with broad full-stack range.
• Shipped polished, production AI or product UIs; able to discuss UX of building with language models: streaming, latency, partial states, failure modes, trust, and cost.
• Deep frontend craft across React/TypeScript, modern CSS, accessibility, animation, and performance.
• A strong design sensibility for typography, layout, hierarchy, color, and interaction.
• You've built or owned a design system and understand component APIs as a product.
• Fluent in both Figma and code, and comfortable bridging design and engineering.

Responsibilities

• The look, feel, and interaction quality of the product end to end, from first interactive prototype to shipped, production-grade UI
• Interfaces that make AI scientific reasoning legible and trustworthy, surfacing provenance, citations, and confidence as first‑class parts of the UI
• The craft of streaming AI: agent runs that unfold live, partial states, tool calls, and reasoning steps, which are the interaction problems most teams get wrong
• A design system and component library that scales across the platform, so quality compounds over time
• Prototyping at every fidelity, from sketch to interactive prototype to shipped feature, working directly with founders and engineers and skipping the static handoff
• Motion, micro‑interactions, latency, and perceived performance: how the app feels under production data and heavy load
• The 20% backend: API and data‑fetching layers, light services, and enough backend fluency to ship a whole feature on your own

Job description

Perceptic is building the AI operating system that powers drug discovery. Senior UX/Design Engineer works at the seam between design and engineering, roughly 80% frontend, 20% backend, and you design in code rather than waiting for a final spec.

Our users are scientists making high-stakes decisions on AI reasoning; the interface decides whether they trust the results. You will own the look and feel end-to-end, surface provenance and confidence, and contribute to a design system while shipping