Senior Frontend Engineer, Design Systems & AI UI

Bazeta; United States; On-site; USD 150,000 - 190,000; Full time

Job summary

Mercury, a fintech company, is seeking a Senior Frontend Engineer for the Design Systems team. You will build and maintain the core components and foundations that power multiple product experiences, with a strong focus on accessibility, performance, and pixel-level craftsmanship.

You will lead UI pattern projects, shape a design system ready for AI integration, mentor peers, and drive rapid prototyping and iteration across teams.

Qualifications

• 7+ years of frontend development experience.
• Experience in design systems or shared component libraries.
• Strong command of modern frontend tooling, build systems, CI/CD, and testing.
• Front-end with AI fluency and ability to leverage AI in design systems.

Responsibilities

• Build and maintain the components, patterns, and foundations (tokens, type, color, layout) that Mercury's product is woven from, with a high bar for accessibility, performance, and pixel-level craft.
• Lead projects that ship new UI patterns to solve real pain points for product teams, helping them build better experiences faster.
• Develop a design system that's ready for AI as well as human use, applying technology to enable leveraged outcomes.
• Invest in the design system's prototyping experience, shaping the next iteration of rapid prototyping, iteration, and exploration of new concepts.
• Raise the craft and AI fluency of the team through mentorship and clear best practices.

Skills

React

TypeScript

Design systems

Component library

CI/CD

Testing

Accessibility

Performance

Product sense

Mentorship

Tools

Vite/Webpack

Job description

Mercury, a fintech company, is seeking a Senior Frontend Engineer for the Design Systems team. You will build and maintain the core components and foundations that power multiple product experiences, with a strong focus on accessibility, performance, and pixel-level craftsmanship.

You will lead UI pattern projects, shape a design system ready for AI integration, mentor peers, and drive rapid prototyping and iteration across teams.