Senior Design Systems Engineer — AI‑Ready UI

Mercury; United States; Remote; USD 201,000 - 251,000; Full time

Job summary

Mercury is seeking a Senior Frontend Engineer on the Design Systems team. You will build and care for the patterns and foundations that Mercury's product is woven from, emphasizing accessibility, performance, and pixel-level craft.

The role leads projects delivering new UI patterns for product teams and advancing AI-ready design systems, while mentoring peers to raise frontend fluency across the organization.

Qualifications

• 7+ years of frontend development experience, with React and TypeScript.
• Experience building or maintaining a design system or shared component library.
• Strong command of modern frontend tooling: build systems, CI/CD, and testing.
• High agency and ability to make decisions in ambiguous spaces.
• Hands-on AI/tech fluency relevant to design systems.

Responsibilities

• Build and maintain the components, patterns, and foundations (tokens, type, color, layout) with accessibility and performance in mind.
• Lead projects shipping new UI patterns to reduce pain points for product teams.
• Develop a design system ready for AI and human use, enabling leveraged outcomes.
• Improve prototyping experience to accelerate iterations and exploration.
• Mentor teammates and establish best practices to raise overall frontend fluency.

Skills

Frontend development

React

TypeScript

Web technologies

Mentorship

Tools

Build systems

CI/CD

Testing

Job description

Mercury is seeking a Senior Frontend Engineer on the Design Systems team. You will build and care for the patterns and foundations that Mercury's product is woven from, emphasizing accessibility, performance, and pixel-level craft.

The role leads projects delivering new UI patterns for product teams and advancing AI-ready design systems, while mentoring peers to raise frontend fluency across the organization.