Frontend Engineer - Design Systems

Mercury’s Design Systems team helps product teams build interfaces that feel consistent, accessible, and carefully considered. We’re hiring a Frontend Engineer to help evolve the shared components and patterns behind those experiences, making it easier for teams across Mercury to turn good ideas into well-crafted software.

You’ll work closely with designers and engineers to understand product needs, explore solutions, and carry improvements into the hands of the teams using them. This role is open to early-career and intermediate engineers. You’ll build depth in frontend engineering and design systems through meaningful project ownership, with guidance from experienced teammates suited to your experience.

Design systems will be your initial focus within the team’s broader Design Foundations work. As opportunities and interests align, you can also contribute to code-based prototyping and tools that help designers and AI agents work with Mercury’s components. Strong AI fluency is part of how we build from the start.

As part of this role, you will:

• Build shared components and patterns that make Mercury’s interfaces better. You’ll work in React and TypeScript, turning recurring product needs into flexible solutions that teams can use across different experiences.
• Partner with designers and product engineers to connect design intent with working software. Help evolve components and tokens across Figma and code, using feedback from real product work to improve the system.
• Improve the quality of the experiences built with our components. Consider how they look and behave for different users, bringing accessibility, thoughtful interactions, and reliable behavior into implementation and testing.
• Make the design system easier to use. Help teams adopt shared patterns and improve the examples, documentation, and workflows that let people build confidently with them.
• Use AI tools to explore approaches and move ideas into working code. Apply your judgment to what agents produce, test the results in context, and contribute useful approaches back to the team.

• A foundation in React, TypeScript, HTML, and CSS, with experience building interfaces and the ability to explain the decisions behind your code.
• Care for visual craft and how people use software, including an interest in accessible interfaces and the details that make interactions feel right.
• Hands-on fluency with AI coding tools. You can provide useful context, evaluate and improve generated code, and verify that it works as intended.
• Ownership and a willingness to learn: you follow work through, communicate when you need help, and use feedback to improve your approach.
• Curiosity about reusable systems and the tradeoffs involved in serving different product needs with shared components.
• An interest in solving problems alongside designers and engineers, contributing ideas, and understanding the needs behind a request.
• Experience with design systems, prototyping, or developer tooling is a plus. You don’t need to have held a design systems role to bring useful skills and ideas to this team.

The total rewards package at Mercury includes base salary, equity (stock options/RSUs), and benefits.

Our salary and equity ranges are highly competitive within the SaaS and fintech industry and are updated regularly using the most reliable compensation survey data for our industry. New hire offers are made based on a candidate’s experience, expertise, geographic location, and internal pay equity relative to peers.