Principal Software Engineer, Frontend - Design Systems

Role Description

We're looking for a Principal Software Engineer to lead the frontend technical direction for the Trellis design system and component library. This is a deeply hands-on role for a builder who loves frontend craft, cares about design quality, but understands that the design system has to serve product engineering’s needs.

• Drive the evolution of the Trellis design system during HubSpot's 2026 UI modernization, shaping the entire product experience.
• Work closely with Trellis team and Product teams to build and expose a world class component library where the default experience sets a high visual bar, beautiful, fast, consistent, and intentional.
• Define the accessibility capability model for Trellis: the controls, toggles, and patterns that let customers and users meet their needs.
• Define and develop internal tooling to support the evolution of Trellis at scale.
• Define and develop the migration tooling that moves HubSpot's Canvas applications to Trellis at scale.
• Make practical decisions about the component library API interface and abstractions exposed to engineers and designers.
• Leverage coding agents to ship production code regularly and lead complex initiatives from idea to rollout.
• Mentor Staff and Senior engineers, and drive organizational thought leadership on frontend craft.
• Partner with engineering leads, PMs, and UX to align frontend direction with HubSpot's product roadmap.

Qualifications

• 14+ years of software engineering experience, with a track record of Principal-scope impact on your organization’s most critical business and customer needs.
• Deep expertise in React, TypeScript, and modern JavaScript frameworks, architecture, and infrastructure.
• Experience developing and shipping a production design system that is used at scale.
• A hands-on builder mindset. You lead by writing, debugging, reviewing, shipping, and thrive on feedback.
• Fluency with AI coding agents, and a perspective on how they change frontend development at scale.

Requirements

• Experience with modern component libraries and tooling, specifically BaseUI and StyleX.
• Understanding of theme deployment infrastructure leveraging Cloudflare Workers.

Benefits

• Annual Cash Compensation Range: $266,200 — $425,900 USD.
• Participation in HubSpot’s equity plan to receive restricted stock units (RSUs).
• Flexible working arrangements, including remote work options.
• Support for candidates requiring accommodations during the hiring process.