Senior Frontend Engineer — Real-Time Cyber Ops UI

Twenty; New York (NY); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

Health benefits

Parental leave

Paid holidays

401(k) plan

Job summary

Twenty Technologies in the United States is seeking a senior frontend engineer to build mission-critical operator interfaces. You will own features end-to-end, craft real-time visualizations, and collaborate across backend, product, design, and operations to ensure reliability in cloud and on-prem environments.

You should have 5–8 years of frontend experience with React/TypeScript, strong web fundamentals, and a track record of shipping performant UI at scale; this is an on-site role with clear

Qualifications

• 5–8 years of frontend experience.
• Strong React.js and TypeScript expertise.
• Solid modern web fundamentals (JavaScript/TypeScript, HTML, CSS).
• Experience shipping features for performance at scale.
• Hands-on with automated testing frameworks.
• Experience with state management patterns/libraries.
• Experience with modern build tooling and CI/CD.
• Collaborates with product/design to deliver high-quality UX.
• Strong Git usage in professional environments.
• BS in CS/Engineering or equivalent practical experience.

Responsibilities

• Build React/TypeScript features at scale.
• Implement real-time UI experiences for complex cyber operation data.
• Contribute to frontend architecture and design decisions.
• Build interactive visualization components (graphs, timelines, streaming views).
• Write and maintain automated tests across unit, integration, and end-to-end layers.
• Participate in code reviews to raise quality.
• Address performance issues, technical debt, and reliability gaps proactively.
• Collaborate with design, product, backend, and operations to deliver features.
• Provide pairing and feedback to peers.

Skills

React.js

TypeScript

JavaScript

HTML/CSS

Testing frameworks

State management

Build tooling

Git

Education

Bachelor's degree in CS/Engineering

Tools

Vitest

React Testing Library

Playwright

Cypress

Vite

Webpack

CI/CD

Job description

Twenty Technologies in the United States is seeking a senior frontend engineer to build mission-critical operator interfaces. You will own features end-to-end, craft real-time visualizations, and collaborate across backend, product, design, and operations to ensure reliability in cloud and on-prem environments.

You should have 5–8 years of frontend experience with React/TypeScript, strong web fundamentals, and a track record of shipping performant UI at scale; this is an on-site role with clear