Senior Software Engineer (Design Systems/AI)

Location: San Francisco, CA; New York, NY; Portland, OR; or remote within Canada or the United States.

Salary: US employees: $200,700–$250,900 USD; Canadian employees: $189,700–$237,100 CAD.

Company

Mercury is a fintech and SaaS company providing business banking services through partner financial institutions.

What you will do

• Build and maintain reusable components, patterns, and foundations including tokens, typography, color, and layout.
• Maintain high standards for accessibility, performance, and pixel-level frontend craft.
• Lead projects that deliver UI patterns solving product-team pain points.
• Develop a design system that supports AI-enabled software development and practical leverage.
• Improve prototyping workflows for rapid design iteration and product exploration.
• Mentor colleagues and establish clear frontend and AI best practices.

Requirements

• 7+ years of frontend development experience, including deep experience with React, TypeScript, and modern web technologies.
• Experience building or maintaining a design system or shared component library.
• Thorough command of modern frontend tooling, including build systems, CI/CD, and testing.
• High agency, ownership, and comfort creating clarity in ambiguous environments.
• First-principles systems thinking focused on clear decisions and outcomes.
• Strong product judgment and an instinct for changes that create leverage across multiple teams.
• Hands-on fluency at the intersection of AI and software development, including emerging AI development paradigms and their practical application to design systems and engineering workflows.

Culture & Benefits

• Work is available from listed US offices or remotely within Canada or the United States.
• Total rewards include base salary, equity through stock options or RSUs, and benefits.
• Compensation is adjusted based on experience, expertise, geographic location, and internal pay equity.
• Mercury is committed to diversity, belonging, equal employment opportunity, and reasonable recruitment accommodations.