Principal Software Engineer, UX – Asset Management Technology Foundations

Fidelity Investments • Boston, MA

6d • $107,000 - $216,000

About The Position

We are seeking a Principal Engineer specializing in UX Design Systems to lead the architecture, quality, and adoption of enterprise design system. This is a senior hands-on technical role with a strong UX bar. You will be responsible for translating user experience principles into scalable, reusable, and accessible design system assets—including design tokens, component libraries (e.g., PrimeNG-based), theming frameworks, and UX standards. You will work at the intersection of UX design and engineering, ensuring that the design system is both user-centered and production-ready, enabling teams to deliver consistent, high-quality experiences across a complex application ecosystem.

Requirements

• Bachelor’s degree in Human-Computer Interaction, Interaction Design, Computer Science, or a related field (advanced degree preferred).
• Extensive experience building and scaling enterprise design systems (tokens, theming, component libraries, governance).
• Proven ability to translate UX design into reusable, systemized engineering assets adopted across large ecosystems.
• Hands-on experience with component ecosystems such as PrimeNG or equivalent UI libraries.
• Deep expertise with Figma and modern design-to-development workflows.
• Strong proficiency in HTML5, CSS3, and TypeScript, with deep expertise in building scalable, maintainable UI systems.
• Hands-on experience developing and maintaining: Design token systems, Reusable UI components and patterns, Theming and styling architectures.
• Experience working with and extending component frameworks (e.g., PrimeNG) to align with enterprise UX standards.
• Strong understanding of accessibility (WCAG) and inclusive design practices.
• Understanding of API-driven UI integration and shared platform services.
• Strong focus on performance, usability, and design quality.

Nice To Haves

• Experience with desktop interoperability platforms and standards, including FDC3, and related interop products, enabling application composition, context sharing, and cross‑application workflows would be a plus.
• Exposure to AI-enabled UX patterns, such as: Context-aware interfaces, Intelligent workflows, Personalization and adaptive UI.
• Familiarity with integrating AI tooling into the design system lifecycle, including: AI-assisted design generation (e.g., Figma AI, Copilot), Code generation and UI scaffolding, Automated UX validation and accessibility checks.

Responsibilities

• Lead the architecture, quality, and adoption of enterprise design system.
• Translate user experience principles into scalable, reusable, and accessible design system assets—including design tokens, component libraries (e.g., PrimeNG-based), theming frameworks, and UX standards.
• Ensure the design system is both user-centered and production-ready.
• Enable teams to deliver consistent, high-quality experiences across a complex application ecosystem.
• Drive UX consistency across multi-application platforms – Desktop, Web and Mobile.
• Influence UX standards, design system adoption, and platform direction at scale.
• Ensure visual and interaction consistency across diverse applications.
• Collaborate closely with designers to ensure fidelity between design and implementation.
• Create prototypes, interaction patterns, and UX validations as needed.

Benefits

• Comprehensive health care coverage
• Emotional well-being support
• Market-leading retirement
• Generous paid time off
• Parental leave
• Charitable giving employee match program
• Educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior