Principal Engineer, UI

Invisible Technologies is the AI training and scaling partner for the leading foundation model providers, enterprises, and governments, bridging the gap between AI potential and production. Invisible’s unique AI Process Platform combines elite global human expertise, cutting edge technology, and deep institutional knowledge gained by training 80% of the world’s leading AI models. Trusted by AWS, Microsoft, and Cohere, we have an unparalleled ability to operationalize AI for real-world applications. Our explosive growth landed us the #2 spot on the Inc. 5000 in 2024, closing the year on $134m revenue.

About The Role
We are looking for a Principal Engineer, UI to join our global technology team. In this role, you’ll lead frontend architecture across multiple products, drive engineering excellence, and mentor a growing team of frontend developers. You'll design and optimize scalable React applications, build robust UI component systems, and define best practices that ensure a seamless, accessible, and performant user experience.

This is a high-impact, hands-on leadership role where you'll collaborate closely with cross-functional stakeholders to bring intuitive and innovative interfaces to life.

What You’ll Do

• Architect and lead scalable React applications using TypeScript and modern front-end tooling
• Design and build modular, reusable UI components and maintain a shared component library
• Optimize performance using advanced techniques like memoization, virtualization, and lazy loading
• Define and enforce accessibility (WCAG/ARIA), responsiveness, and UI consistency standards
• Integrate GraphQL APIs and manage real-time data workflows
• Implement comprehensive testing strategies using Jest, Cypress, and React Testing Library
• Collaborate with product, design, and backend teams to define and deliver product features
• Guide the evolution of our design system and frontend architecture
• Mentor engineers, driving a culture of clean code, continuous improvement, and technical mastery
• Contribute to strategic planning and engineering roadmap decisions

What We Need

• 8+ years of frontend engineering experience, including architectural leadership on complex products
• Proven success in optimizing UI performance at scale
• Strong understanding of GraphQL APIs, including real-time interactions
• Experience with UI design systems and component-driven development workflows
• Proficiency in styling technologies like Tailwind CSS, SCSS/SASS, and Styled Components
• Fluency in build tools and version control (Webpack, Babel, NPM/Yarn, Git)
• Hands-on experience with accessibility implementation and responsive design
• Passion for mentoring and building world-class engineering teams
• Strong communication, strategic thinking, and problem-solving abilities

What’s In It For You

Compensation: Invisible is committed to fair and competitive pay, ensuring that compensation reflects both market conditions and the value each team member brings. Our salary structure accounts for regional differences in cost of living while maintaining internal equity.

An Invisible Talent Acquisition Partner can provide more information on which locations are included in each of our geographic pay tiers during the interview process. For candidates outside the U.S., compensation will be adjusted to reflect local market conditions and cost-of-living differentials.

Bonuses and equity are included in offers above entry level. Final compensation is determined by a combination of factors, including location, job-related experience, skills, knowledge, internal pay equity, and overall market conditions. Because of this, every offer is unique. Additional details on total compensation and benefits will be discussed during the hiring process.

What It’s Like to Work at Invisible:

At Invisible, we’re not just redefining work—we’re reinventing it. We operate at the intersection of advanced AI and human ingenuity, pushing the boundaries of what’s possible to unlock productivity and scale. Ownership is at the core of everything we do. Here, you won’t just execute tasks—you’ll build, innovate, and shape the future alongside world-class clients pushing the boundaries of AI.

We expect bold ideas, relentless drive, and the ability to turn ambiguity into opportunity. The pace is fast, the challenges are big, and the growth is unmatched. We’re not for everyone, and we’re okay with that. If you’re looking for predictable routines, this isn’t the place for you. But if you’re driven to create, thrive in dynamic environments, and want a front-row seat to the AI revolution, you’ll fit right in.