Senior Frontend Software Engineer

About The Company

Twenty Technologies (www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies. Founded in 2024, Twenty has raised $138M from leading investors including Accel, Caffeinated Capital, Friends & Family Capital, Point72 Ventures, General Catalyst, and In-Q-Tel. Headquartered in Arlington, Virginia, Twenty is dedicated to ensuring American and allied primacy in cyberspace.

Who You Are

• Care about building software that has real-world impact in high-stakes environments
• Write clean, precise, and well-tested code
• Think carefully about performance, reliability, accessibility, and maintainability
• Make sound tradeoffs under constraints and communicate them clearly to teammates
• Enjoy complex data problems and turn them into interfaces that help users act quickly
• Take ownership of your work end-to-end — from design review to production
• Default to secure engineering practices and treat trust, safety, and correctness as non-negotiable

What You'll Do

• Build sophisticated React/TypeScript features and components that operate reliably at scale
• Implement real-time UI experiences for complex cyber operation data, optimizing for speed and clarity
• Contribute to frontend architecture and design decisions alongside your teammates
• Build and maintain interactive visualization components (e.g., graphs, timelines, streaming views)
• Write and maintain automated tests across unit, integration, and end-to-end layers
• Participate actively in code review — giving and receiving feedback that raises the quality bar
• Identify and address performance issues, technical debt, and reliability gaps proactively
• Collaborate with design, product, backend, and operations to deliver well-integrated features
• Support engineers through pairing and practical feedback on their work

Qualifications

• 5–8 years of professional frontend software development experience
• Strong, production-tested expertise in React.js and TypeScript
• Solid command of modern web fundamentals (JavaScript/TypeScript, HTML, CSS)
• Experience building and shipping features for performance at scale (profiling, optimization, rendering strategies)
• Hands-on experience with automated testing frameworks (e.g., Vitest, React Testing Library, Playwright or Cypress)
• Experience with state management patterns and libraries (e.g., Redux, Zustand, or React Query)
• Experience with modern build tooling (e.g., Vite or Webpack) and CI/CD pipelines
• Collaborate effectively with product and design to deliver high-quality UX
• Strong command of Git in a professional engineering environment, including branch workflows, code review practices, and CI integration
• Bachelor's degree in CS/Engineering (or equivalent practical experience)

Benefits

• Health. Medical, dental, and vision plan options
• Life / AD&D, disability coverage options
• Family. Paid parental leave for eligible full-time employees
• Vacation. Paid holidays and flexible PTO
• Retirement. 401(k) with pre-tax and Roth options. HSA/FSA options, dependent care FSA

Pay

$159K - $263K

Schedule

N/A

Skills

N/A

Benefits

• Health. Medical, dental, and vision plan options
• Life / AD&D, disability coverage options
• Family. Paid parental leave for eligible full-time employees
• Vacation. Paid holidays and flexible PTO
• Retirement. 401(k) with pre-tax and Roth options. HSA/FSA options, dependent care FSA