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TwentyTwenty

Senior Frontend SWE

Builds high-performance React/TypeScript interfaces for real-time cyber operation data visualization. Owns frontend features end-to-end, focusing on performance, testing, and collaboration in mission-critical environments. Requires 5-8 years experience.

About the job

What You'll Do

  • Build sophisticated React/TypeScript features and components that operate reliably at scale.
  • Implement real-time UI experiences for complex cyber operation data, optimizing for speed and clarity.
  • Contribute to frontend architecture and design decisions alongside your teammates.
  • Build and maintain interactive visualization components (e.g., graphs, timelines, streaming views).
  • Write and maintain automated tests across unit, integration, and end-to-end layers.
  • Participate actively in code review — giving and receiving feedback that raises the quality bar.
  • Identify and address performance issues, technical debt, and reliability gaps proactively.
  • Collaborate with design, product, backend, and operations to deliver well-integrated features.
  • Support engineers through pairing and practical feedback on their work.

Qualifications

Must Have

  • 5–8 years of professional frontend software development experience.
  • Strong, production-tested expertise in React.js and TypeScript.
  • Solid command of modern web fundamentals (JavaScript/TypeScript, HTML, CSS).
  • Experience building and shipping features for performance at scale (profiling, optimization, rendering strategies).
  • Hands-on experience with automated testing frameworks (e.g., Vitest, React Testing Library, Playwright or Cypress).
  • Experience with state management patterns and libraries (e.g., Redux, Zustand, or React Query).
  • Experience with modern build tooling (e.g., Vite or Webpack) and CI/CD pipelines.
  • Collaborate effectively with product and design to deliver high-quality 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).

Nice to Have

  • Experience with complex data visualization (e.g., D3.js, Chart.js, or similar).
  • Exposure to graph databases or graph query patterns (e.g., Neo4j).
  • Experience with real-time streaming data and live system visualization.
  • Worked in defense, security, or other mission-critical domains.
  • Built UI experiences that surface AI/ML outputs in operational workflows.
  • Experience contributing to component libraries or design systems (e.g., Storybook).">

Skills

React, TypeScript, JavaScript, HTML, CSS, Vitest, React Testing Library, Playwright, Cypress, Redux, Zustand, React Query, Vite, webpack, Git

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