Senior UI Platform Engineer — Design System & Frameworks

Addepar; New York (NY); On-site; USD 134,000 - 168,000; Full time

Job summary

Addepar is seeking a Senior Software Engineer to join the Client Experience Frameworks group. You’ll build the UI platform, a design system and component library used across multiple frontend technologies, enabling thousands of investment professionals to work efficiently.

You’ll own architectural direction, improve tooling, and ensure performance and accessibility. This role is on-site in New York with compensation benchmarked around $134,000–$168,000 base, plus bonus, equity, and benefits.

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 1 year of experience as a professional software engineer (internships count).
• You have solid TypeScript or JavaScript fundamentals and a desire to deepen your expertise.
• You have experience with at least one modern UI framework (React, Vue, Svelte, Angular, Ember, or similar) and curiosity about how they work under the hood.
• You have some familiarity with web standards: how the DOM works, browser APIs, and how components render and update.
• You have exposure to build tools and bundlers (Webpack, Vite, or similar) - you don't need to be an expert, but you're not afraid of configuration.
• You care about writing clean, generic, reusable code and have an eye for detail.
• You're comfortable asking questions, giving and receiving feedback in code review, and learning from more experienced engineers.

Responsibilities

• Build and maintain framework-agnostic UI components that serve product teams working across multiple frontend technologies simultaneously.
• Support adoption of the design system across the product engineering organization, helping teams integrate and migrate.
• Contribute to developer experience through build tooling, testing infrastructure, documentation, and automation.
• Write declarative, well-tested, and accessible component code with attention to detail and long-term maintainability.
• Learn and work across multiple frontend frameworks, developing a deep understanding of how they relate to underlying web standards.
• Participate in design reviews with a high bar for component architecture, API design, and consistency.
• Champion performance, accessibility, and web standards as first-class concerns in everything the team ships.

Skills

TypeScript

JavaScript

UI framework experience

Build tools

Web standards

Component architecture

Accessibility

Education

B.S. in CS

MS/PhD in CS

Tools

Webpack

Vite

Job description

Addepar is seeking a Senior Software Engineer to join the Client Experience Frameworks group. You’ll build the UI platform, a design system and component library used across multiple frontend technologies, enabling thousands of investment professionals to work efficiently.

You’ll own architectural direction, improve tooling, and ensure performance and accessibility. This role is on-site in New York with compensation benchmarked around $134,000–$168,000 base, plus bonus, equity, and benefits.