Senior Frontend Software Engineer

The role

You will build mission-critical operator experiences by implementing high-performance interfaces that visualize real-time cyber operation data. You will contribute to frontend architecture and own significant features end-to-end.

What you will do

• Build sophisticated React/TypeScript features and components.
• Implement real-time UI experiences for complex cyber operation data.
• Contribute to frontend architecture and design decisions.
• Build and maintain interactive visualization components.
• Write and maintain automated tests across unit, integration, and end-to-end layers.
• Participate actively in code review.
• Identify and address performance issues, technical debt, and reliability gaps.
• Collaborate with design, product, backend, and operations.
• Support engineers through pairing and practical feedback.

Required 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.
• 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.
• 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).
• Exposure to graph databases or graph query patterns (e.g., Neo4j).
• Experience with real-time streaming data and live system visualization.
• Worked in defense, security, or other mission-critical domains.
• Built UI experiences that surface AI/ML outputs in operational workflows.
• Experience contributing to component libraries or design systems (e.g., Storybook).

Benefits

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

Before you apply

• Role is limited to U.S. citizens.
• Some positions may require eligibility to obtain and maintain a U.S. Government security clearance.

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.