Senior Frontend Engineer for Real-Time Cyber UIs

Twenty; Arlington (VA); On-site; USD 159,000 - 263,000; Full time

Benefits offered by this job

Health benefits

Parental leave

Vacation & PTO

Retirement plan

Job summary

Twenty Technologies, headquartered in Arlington, VA, is seeking a high-output frontend engineer. You will build mission-critical operator experiences, visualizing real-time cyber operation data with speed and precision.

You’ll own features end-to-end and collaborate across frontend, backend, product, design, and operations to ship reliable capabilities in cloud and on-premise environments. The role emphasizes performance, secure engineering practices, and delivering high-quality UX in a

Qualifications

• 5–8 years of frontend experience in professional settings.
• Strong React.js and TypeScript expertise with production-grade code.
• Solid command of modern web fundamentals (JS/TS, HTML, CSS).
• Experience shipping scalable, high-performance features.
• Hands-on testing with Vitest, RTL, Playwright or Cypress.
• State management with Redux/Zustand/React Query.
• Experience with Vite or Webpack and CI/CD pipelines.
• Collaborates well with product/design to deliver high-quality UX.
• Git proficiency including workflows and CI integration.
• Bachelor's degree in CS/Engineering or equivalent.

Responsibilities

• Build sophisticated React/TypeScript features and components at scale.
• Implement real-time UI experiences for complex cyber data.
• Contribute to frontend architecture and design decisions.
• Build interactive visualizations (graphs, timelines, streaming views).
• Write and maintain automated tests across units and end-to-end layers.
• Participate in code reviews to raise quality standards.
• Address performance, technical debt, and reliability gaps proactively.
• Collaborate with design, product, backend, and operations teams.
• Support engineers via pairing and practical feedback.

Skills

React.js

TypeScript

JavaScript

HTML/CSS

Testing

Redux/Zustand/React Query

Git

Build tooling

CI/CD

Performance optimization

Education

Bachelor's degree in CS/Engineering

Tools

Vitest

React Testing Library

Playwright

Cypress

Vite

Webpack

Redux

Job description

Twenty Technologies, headquartered in Arlington, VA, is seeking a high-output frontend engineer. You will build mission-critical operator experiences, visualizing real-time cyber operation data with speed and precision.

You’ll own features end-to-end and collaborate across frontend, backend, product, design, and operations to ship reliable capabilities in cloud and on-premise environments. The role emphasizes performance, secure engineering practices, and delivering high-quality UX in a