Staff/Principal Frontend Software Engineer

The role

You will own the frontend architecture for mission-critical operator experiences. You will build high-performance interfaces to visualize complex cyber operation data in real time.

What you will do

• Architect and build sophisticated React/TypeScript applications.
• Design real-time UI experiences for complex cyber operation data.
• Lead frontend technical architecture and design decisions.
• Build and evolve interactive visualization systems.
• Establish reusable frontend architecture patterns and component libraries.
• Raise engineering excellence via code review, standards, testing strategy, and performance practices.
• Mentor junior engineers through pairing, feedback, technical coaching, and knowledge transfer.
• Coordinate execution across design, product, backend, and operations.
• Troubleshoot production issues and lead frontend performance investigations.

Required qualifications

• 8+ years of professional frontend software development experience.
• Deep expertise building production React.js applications with TypeScript.
• Strong command of modern web fundamentals (JavaScript/TypeScript, HTML, CSS).
• Led frontend technical initiatives and mentored engineers.
• Experience building for performance at scale.
• Experience with automated testing practices and frameworks (e.g., Vitest, React Testing Library, Playwright or Cypress for E2E).
• Hands-on experience with state management patterns and libraries (e.g., Redux, Zustand, or React Query).
• Strong collaboration skills with product and design.
• Strong command of Git in a professional engineering environment.
• Bachelor’s degree in CS/Engineering (or equivalent practical experience).

Nice to have

• Experience with complex data visualization (e.g., D3.js, Chart.js, or similar).
• Worked with graph databases and understand graph query patterns (e.g., Neo4j).
• Experience with real-time streaming data and production visualization of live systems.
• Experience in defense, security, or other mission-critical domains.
• Built UI experiences that surface AI/ML outputs in operational workflows.
• Experience with component library or design system development (e.g., Storybook).

Benefits

• Medical, dental, and vision plan options.
• Life / AD&D, disability coverage options.
• Paid parental leave: 12 weeks for birthing parents, 4 weeks for non-birthing parents, 6 weeks for adoptive, foster, or intended parents.
• Paid holidays and flexible PTO.
• 401(k) with pre-tax and Roth options.
• HSA/FSA options, dependent care FSA.

Before you apply

• U.S. Citizenship Required

About the company

Twenty Technologies industrializes offensive cyber operations for the U.S. and its allies. Headquartered in Arlington, Virginia, the company was founded in 2024.