Staff Frontend Engineer — Real-Time Ops UI Architect

Twenty; United States; On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Health benefits

Parental leave

Flexible PTO

401(k)

On-site parking

Job summary

Twenty seeks a Senior Frontend Architect to own the frontend architecture for mission-critical operator experiences. You will build high-performance interfaces that visualize real-time cyber operation data and lead technical direction for UI systems.

You will mentor engineers, collaborate with design, product, and backend teams, and ensure reliable delivery across cloud and on-premises environments. A strong focus on performance and secure engineering is essential.

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 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.
• 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 (e.g., 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

React.js

TypeScript

Frontend architecture

Mentoring

Performance optimization

Testing (Vitest)

Testing Library (RTL)

Playwright or Cypress

State management (Redux)

Git & CI

Education

Bachelor's degree in CS/Engineering

Tools

Vitest

React Testing Library

Playwright

Cypress

Redux

Zustand

React Query

Job description

Twenty seeks a Senior Frontend Architect to own the frontend architecture for mission-critical operator experiences. You will build high-performance interfaces that visualize real-time cyber operation data and lead technical direction for UI systems.

You will mentor engineers, collaborate with design, product, and backend teams, and ensure reliable delivery across cloud and on-premises environments. A strong focus on performance and secure engineering is essential.