Staff Software Engineer (Core UI)

SimSpace is an AI Proving Ground where organizations can confidently train, test, and outmaneuver adversaries in any environment. They are seeking a Staff Software Engineer for their Core UI team, responsible for setting frontend architecture and standards, leading complex UI initiatives, and mentoring other engineers. This role emphasizes hands-on technical leadership and collaboration with UX Designers and Product Managers.

Responsibilities:

• Serve as the senior-most technical voice for SimSpace's core frontend, owning architecture decisions and the technical roadmap for shared UI systems
• Lead major frontend initiatives end to end—from requirements gathering and architecture design through delivery—setting clear goals, priorities, and technical direction
• Steward architectural decisions and manage technical and UX debt deliberately, balancing long-term health with delivery needs
• Define and enforce frontend technical standards for code health, performance, testing, and documentation
• Mentor Design Engineers and frontend engineers, modeling strong craft, collaboration, and pragmatism
• Design, build, extend, and maintain SimSpace's design system (e.g., Monorail) and higher-order component libraries, emphasizing consistency, accessibility, responsiveness, and performance
• Contribute directly and deeply to the code, ensuring shared systems stay aligned between design (Figma) and implementation (code, Storybook)
• Review and curate contributions from other engineers to shared UI libraries, maintaining high standards for UX quality and code health
• Act as a technical partner to UX Designers—providing feasibility feedback, implementation guidance, and UI engineering insight early in the design process
• Define, improve, and automate the workflows that turn design intent into production code efficiently and predictably
• Develop prototyping workflows that let UX research gather customer feedback and iterate on designs quickly
• Lead accessibility (a11y) best practices at the component and system level
• Define standards, documentation, and WCAG-aligned guidance that help engineers build accessible interfaces
• Identify gaps through testing and drive remediation across shared systems
• Identify and address UX and UI quality issues—visual inconsistencies, interaction gaps, and usability bugs—across the product
• Conduct code reviews and provide constructive feedback to ensure quality, performance, and adherence to standards
• Create documentation, examples, and internal talks that help frontend engineers use shared UI systems effectively, and support initiatives like theming, white-labeling, and design token strategy
• Lead UI-focused initiatives end to end, balancing ideal UX outcomes with delivery realities

Requirements:

• 8+ years of professional experience in frontend, UX, or design-adjacent engineering, including a track record of leading technical projects end to end
• Deep expertise in TypeScript and React—modern component patterns, state management, and performance—sufficient to set architectural direction for shared systems
• Experience building and maintaining design systems or shared UI libraries used by multiple teams
• Solid understanding of accessibility (a11y) standards and how to operationalize them in real-world interfaces
• Experience writing well-tested, well-documented UI code intended for reuse and scale
• Proven ability to collaborate closely with designers, product managers, and engineers across teams
• Experience with Storybook, design tokens, and Figma-to-code workflows
• Familiarity with frontend testing strategies (unit, visual, and accessibility testing)
• Experience with responsive design systems and theming or white-labeling approaches
• Experience with rapid UI prototyping and iterating against customer and UX research feedback
• Comfort working across the stack when needed (API integration, backend collaboration)
• Interest in emerging tools and workflows, including AI-assisted UI development and prototyping
• Experience bootstrapping services or libraries with CI/CD tooling (e.g., GitHub Actions, ArgoCD)