Senior Frontend Architect for Real-Time Cyber UI

twenty; New York (NY); On-site; USD 150,000 - 230,000; Full time

Benefits offered by this job

Health insurance

Paid holidays

401(k) with pre-tax and Roth options

HSA/FSA options

Job summary

Twenty Technologies is seeking an experienced Frontend Engineer to own the frontend architecture for mission-critical operator interfaces, delivering high-performance UI systems for real-time cyber operation data. You'll collaborate with backend, product, design, and operations to ship end-to-end features in cloud and on-prem environments.

You will lead frontend direction, mentor engineers, and champion secure, scalable, and reliable UI practices across a small, cross-functional team with tight

Qualifications

• 8+ years of professional frontend software development experience.
• Deep expertise building production React.js applications with TypeScript.
• Strong command of modern web fundamentals (JavaScript/TypeScript, HTML, CSS).
• Led frontend technical initiatives and mentored engineers through delivery and growth.
• Experience building for performance at scale (profiling, optimization, rendering strategies).
• Experience with automated testing practices and frameworks (Vitest, React Testing Library, Playwright or Cypress for E2E).
• Hands-on experience with state management patterns and libraries (Redux, Zustand, or React Query).
• Strong collaboration skills with product and design to deliver excellent UX.
• Strong command of Git in a professional engineering environment, including branch workflows, code review practices, and CI integration.
• You have a Bachelor’s degree in CS/Engineering (or equivalent practical experience).

Responsibilities

• Architect and build sophisticated React/TypeScript applications that operate smoothly at scale.
• Design real-time UI experiences for complex cyber operation data, optimizing for speed and clarity.
• Lead frontend technical architecture and design decisions.
• Build and evolve interactive visualization systems (graphs, timelines, streaming views).
• Establish reusable frontend architecture patterns and component libraries for consistency and velocity.
• Raise engineering excellence via code review, standards, testing strategy, and performance practices.
• Mentor junior engineers through pairing, feedback, technical coaching, and knowledge transfer.
• Coordinate execution across design, product, backend, and operations to deliver end-to-end features.
• Troubleshoot production issues, lead frontend performance investigations, and improve reliability over time.

Skills

Frontend development

React with TypeScript

Web fundamentals

Performance optimization

Mentoring

Education

Bachelor’s degree in CS/Engineering

Tools

Vitest

React Testing Library

Playwright/Cypress

Redux

Zustand

React Query

Storybook

Job description

Twenty Technologies is seeking an experienced Frontend Engineer to own the frontend architecture for mission-critical operator interfaces, delivering high-performance UI systems for real-time cyber operation data. You'll collaborate with backend, product, design, and operations to ship end-to-end features in cloud and on-prem environments.

You will lead frontend direction, mentor engineers, and champion secure, scalable, and reliable UI practices across a small, cross-functional team with tight