Lead Frontend Engineer

Job Description Zyphra is an artificial intelligence company based in San Francisco, California.The Role:As a Lead Frontend Engineer, you'll lead the design and development of the user-facing side of our agentic system, shaping how users interact with AI across their desktop, browser, and filesystem. You'll work across interface design, component libraries, and frontend infrastructure to craft seamless, accessible, and intuitive user experiences. You'll work closely with engineers, ML researchers, and backend teams to bring intelligent agents to life in a way that's beautifully simple and deeply useful.You'll Work Across:Design and development of browser-based and desktop interfacesBuilding and maintaining component libraries and styling systemsResearching and refining user flows based on real-world usage and feedbackPrototyping and implementing UI features in collaboration with ML, backend, and systems teamsMaking a complex AI product feel simple, accessible, and empowering for a wide range of usersWhat We're Looking For / Requirements:Strong frontend engineering skills with fluency in HTML, CSS, and JavaScript/TypeScriptExperience with modern frontend frameworks such as ReactDemonstrated attention to UI detail and usability, with a user-first mindsetAbility to prototype and iterate quickly, both in code and with design tools like FigmaExperience designing and developing responsive, accessible, and high-performance interfacesStrong intuition for HCI principles, accessibility, and visual clarityExcellent collaboration and communication skills—especially with engineers, designers, and ML researchersQualifications / Additional Skills:Experience designing or building browser extensions or desktop applications (e.g., Electron, Tauri)Experience with mobile platforms and responsive design (not required but helpful)Prior work on products involving complex workflows, automation, or agentic behaviorInterest or experience in backend development, APIs, or AI systems to better interface with the full stackFamiliarity with accessibility standards and inclusive design best practicesA track record of launching polished and user-loved productsPassion for systems-level thinking: building reusable design systems, libraries, and scalable patternsA clear, opinionated eye for elegant design and user delightWhy Work at Zyphra:Our research methodology is grounded in methodical, step-by-step approaches to ambitious goals. Both deep research and engineering excellence are equally valuedWe strongly value new and crazy ideas and are very willing to bet big on new ideasWe move as quickly as we can; we aim to minimize the bar to impact as low as possibleWe all enjoy what we do and love discussing AIBenefits and Perks:Comprehensive medical, dental, vision, and FSA plansCompetitive compensation and 401(k) planRelocation and immigration support on a case-by-case basisIn-office snacks and meals providedUnlimited PTO and company holidaysIn-person team in San Francisco with a collaborative, high-energy environment