Staff UI Frameworks Engineer — Design System Leader

Addepar; Mountain View (CA); On-site; USD 150,000 - 234,000; Full time

Job summary

Addepar is seeking a Staff Software Engineer to join our Client Experience Frameworks group in Mountain View, CA. You will own the UI platform that powers product engineers with a design system and component library across multiple frontend frameworks.

You’ll drive adoption, shape architecture, and deliver framework-agnostic components with performance, accessibility, and web-standards in mind, while mentoring engineers across teams.

Qualifications

• You have a B.S., M.S., or Ph.D. in Computer Science or a similar technical field (or equivalent practical experience)
• You have at least 5 years of experience as a professional software engineer
• You have deep TypeScript expertise and strong opinions about type-safe, maintainable code
• You have significant experience with modern UI frameworks (component architecture, reactivity, state management) — and ideally have worked across more than one
• You understand the web platform deeply: Web Components, browser APIs, the DOM, and how frameworks abstract over them
• You have experience with build systems and bundlers (Webpack, Vite, Rollup, or similar)
• You've built or maintained a design system, component library, or shared UI infrastructure used by other engineering teams
• You have a track record of influencing technical decisions across teams and managing stakeholders with competing needs
• You bring a pragmatic approach to technical debt and tradeoffs — you know when to invest in architecture and when to ship
• You have excellent written and verbal communication skills

Responsibilities

• Design and build framework-agnostic UI components that serve product teams working across multiple frontend technologies simultaneously
• Drive adoption of the design system across the product engineering organization, consulting with teams and unblocking migration efforts
• Own end-to-end technical delivery: scoping work with stakeholders, making architecture decisions, and following through to production
• Improve developer experience through build tooling, testing infrastructure, documentation, and automation
• Make thoughtful decisions about component composition, API design, and long-term maintainability of a system used by 250+ engineers globally
• Champion performance, accessibility, and web standards as first-class concerns in everything the team ships
• Provide cross-team technical leadership through code review, consulting, and mentorship

Skills

TypeScript

UI frameworks

Build systems

Design system

Cross-team collaboration

Mentorship

Communication

Education

B.S., M.S., or Ph.D. in Computer Science

Tools

Webpack

Vite

Rollup

Web Components

Browser APIs

Job description

Addepar is seeking a Staff Software Engineer to join our Client Experience Frameworks group in Mountain View, CA. You will own the UI platform that powers product engineers with a design system and component library across multiple frontend frameworks.

You’ll drive adoption, shape architecture, and deliver framework-agnostic components with performance, accessibility, and web-standards in mind, while mentoring engineers across teams.