Job Title: Senior UI Software Engineer (On Site)
Location: Boulder, CO
No C2C Offers please. Candidates must be able to work in the US without a sponsor.
Our client is engineering a next-generation Work Orchestration platform—one that transforms complex organizational processes into clear, intuitive, action-driven experiences. Their UI and UX are central to that mission. They develop their front end using WiseJ, enabling engineers to build rich, enterprise interfaces entirely in C# and .NET—with strongly typed code, centralized controls , and without the typical bloat of sprawling JavaScript frameworks and constantly shifting third-party libraries. Their engineering team is supported by a world-class, fully-managed Figma Design System, including design tokens, responsive variants, and component-compliant wireframes and prototypes. This gives engineers a complete, consistent UI blueprint—freeing them to focus on architecture, performance, and behavior rather than recreating UI patterns from scratch. If you want to build beautifully engineered, large-scale UI systems in an environment designed for clarity and craftsmanship, Nexee is the place.
Position Overview: We are seeking a Senior UI Software Engineer to lead development of a an enterprise-grade interface. You will architect highly interactive, intelligent User Interfaces using a unified .NET and WiseJ stack, while collaborating closely with product and design to deliver a first-class user experience.
Key Responsibilities
• Architect and implement high-performance user interfaces using WiseJ, C#, and .NET, with a strongly typed and unified codebase.
• Translate Figma design system components, wireframes, and prototypes directly into consistent, pixel-aligned engineering implementations.
• Develop adaptive layouts, multi-panel interfaces, drag-and-drop tools, and other advanced interaction patterns for enterprise-scale use cases.
• Maintain clean, composable, reusable UI architecture that avoids unnecessary libraries and minimizes complexity.
• Collaborate with UX, product, and backend engineering to ensure seamless integration across all system layers.
• Contribute to UI standards, internal tooling, code quality, and mentorship of other engineers.
• Team management experience.
Qualifications Required
• Bachelor’s in Computer Science, Engineering, or related field.
• 6–10+ years of UI engineering experience with complex, data-heavy, or enterprise platforms.
• Strong proficiency in C#, .NET, Visual Studio, and object-oriented UI development.
• Experience designing and shipping real-time, component-driven UI systems.
• Deep understanding of UI architecture, state management, and interaction modeling.
Preferred (Not Required)
• Experience with WiseJ or other server-managed UI frameworks.
• Experience working with structured Figma design systems, including tokens, variants, and engineering-aligned prototypes.
• Background building reusable UI component libraries and internal platform frameworks.
• Familiarity with distributed systems, real-time data and workflow automation tools.
Why this job?
• Competitive salary and benefits
• Collaborative, high-talent, on-site engineering culture in Boulder, CO
• A unified, strongly typed UI stack—no fractured front-end layers
• Direct influence over a platform designed for massive scale
• A culture that values clarity, simplicity, craftsmanship, and deep work How to
• Competitive salary and benefits.
• A flexible and dynamic work environment.
• Opportunities for professional growth and development.
• A culture that values work-life balance.
• The chance to be part of a transformative enterprise solution.