Cheiron - Senior Frontend Engineer (Los Altos)
Requirements
• 4+ years of frontend experience with React, TypeScript, Tailwind CSS, and modern JavaScript • Deep understanding of component architecture, design system implementation, state management, API integration, and performance optimization • Frontend ownership: you've personally raised the quality and standards of a product's frontend and reviewed and guided other engineers' frontend work, including full-stack engineers • The skill to turn designer specs into production-quality UI, with the persistence to carry responsiveness, accessibility, interaction states, and pixel details all the way through • Experience integrating AI/LLM products on the frontend: you've solved AI-specific UX challenges like streaming, non-deterministic results, long-running execution, and citation display • Active use of AI coding tools such as Claude Code and Cursor • The drive to set your own priorities and ship quickly, even when specs are incomplete • English proficiency across docs, conversation, and code review (daily collaboration with a multi-region team) • Experience building and operating an in-house design system or component library from scratch — design and governance, not just usage • Data-heavy UI experience: complex tables, virtualization, large result rendering, or document- and form-centric interfaces • Experience with modern frontend tooling and test infrastructure such as Next.js, Vite, React Query, Zustand/Redux, Storybook, Playwright, and Vitest • Experience building enterprise SaaS, or pharma, biotech, or healthcare products • Experience at a seed or early-stage startup
Responsibilities
• Own the quality, standards, and consistency of Cheiron's frontend: architecture, component patterns, design system, coding conventions, review culture, and refactoring existing code • Bridge Product, Design, and Engineering so that design intent and product goals are faithfully reflected in the frontend • Build UX that makes AI agent results trustworthy: streaming responses, source and citation display, multi-step progress states, error and retry flows, and feedback loops • Own pre-launch design QA: polish responsiveness, interactions, and pixel details all the way through so the designer's intent doesn't get lost in implementation • Build core screens and interactions in React, TypeScript, and Tailwind CSS — a lead who still builds with their hands • Guide and review other engineers' frontend contributions (including full-stack engineers) and raise the team's frontend bar • Collaborate effectively in English with a distributed team across the US, Korea, and beyond
Benefits
• 401(K) retirement plan • Health insurances (Medical/Dental/Vision) • Meal allowance (Lunch, Dinner) • Transportation support for early starts and late nights • In-office snack bar and additional commuting and work travel support • ■ Interview Process • ■ Interview Process • Screening ＞ Take-home Assignment ＞ Technical Interview ＞ Cultural Interview
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