Senior Frontend Engineer — Real-Time Cyber UI

Twenty Technologies; New York (NY); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Health

Family benefits

Vacation & PTO

401(k) plan

Job summary

Twenty Technologies is seeking a senior frontend engineer to build mission-critical operator interfaces. You will own end-to-end features, implement real-time visualizations, and collaborate across frontend, backend, product, design, and operations to ship reliable UI in cloud and on-prem environments.

Join a high-performance team focused on scalable React/TypeScript components, speed, accessibility, and maintainability, while writing tests and participating in code reviews.

Qualifications

• Five to eight years of frontend software development experience.
• Production-tested expertise in React.js and TypeScript.
• Strong command of web fundamentals (JavaScript/TypeScript, HTML, CSS).
• Experience shipping features for performance at scale (profiling, optimization).
• Hands-on with automated testing frameworks (Vitest, React Testing Library, Playwright or Cypress).
• Experience with state management libraries (Redux, Zustand, React Query).
• Experience with modern build tools and CI/CD.

Responsibilities

• Build sophisticated React/TypeScript features and components at scale.
• Implement real-time UI experiences for complex cyber operation data.
• Contribute to frontend architecture and design decisions.
• Build and maintain interactive visualization components (graphs, timelines).
• Write and maintain automated tests across unit, integration, and end-to-end layers.
• Participate in code reviews to raise quality.

Skills

Frontend architecture

Performance optimization

Automated testing

Collaboration with product/design

Real-time data visualization

Code reviews

Education

Bachelor's degree in CS/Engineering

Tools

React.js

TypeScript

Vite/Webpack

Git & CI/CD

Job description

Twenty Technologies is seeking a senior frontend engineer to build mission-critical operator interfaces. You will own end-to-end features, implement real-time visualizations, and collaborate across frontend, backend, product, design, and operations to ship reliable UI in cloud and on-prem environments.

Join a high-performance team focused on scalable React/TypeScript components, speed, accessibility, and maintainability, while writing tests and participating in code reviews.