Twenty

Senior Frontend Software Engineer

Twenty
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5 months ago
Arlington, VA, USA or New York, NY, USASenior / Staff+

Base Salary

$159k - $263k/yr

Responsibilities

  • Build and maintain scalable React and TypeScript features and components.
  • Implement high-performance real-time interfaces for complex cyber operation data.
  • Contribute to frontend architecture and design decisions.
  • Create interactive visualizations such as graphs, timelines, and streaming views.
  • Write and maintain unit, integration, and end-to-end automated tests.
  • Identify and resolve performance issues, technical debt, and reliability gaps.
  • Collaborate with design, product, backend, and operations teams to deliver integrated features.
  • Participate in code reviews and support other engineers through pairing and practical feedback.

Requirements

  • 5–8 years of professional frontend software development experience.
  • Production expertise with React and TypeScript and strong command of JavaScript, HTML, and CSS.
  • Experience optimizing frontend performance at scale, including profiling, optimization, and rendering strategies.
  • Hands-on experience with automated testing frameworks such as Vitest, React Testing Library, Playwright, or Cypress.
  • Experience with state management patterns and libraries such as Redux, Zustand, or React Query.
  • Experience with modern build tooling such as Vite or Webpack and CI/CD pipelines.
  • Strong Git experience, including branch workflows, code review practices, and CI integration.
  • Ability to collaborate with product and design teams to deliver high-quality user experiences.
  • Bachelor’s degree in Computer Science or Engineering, or equivalent practical experience.
  • Preferred experience with data visualization tools such as D3.js or Chart.js, graph databases such as Neo4j, real-time streaming data, defense or security domains, AI/ML operational interfaces, or component libraries such as Storybook.

Benefits

  • Medical, dental, vision, life, AD&D, and disability coverage options.
  • Paid parental leave, including 12 weeks for birthing parents, 4 weeks for non-birthing parents, and 6 weeks for adoptive, foster, or intended parents through surrogacy.
  • Paid holidays and flexible paid time off.
  • 401(k) with pre-tax and Roth options, plus HSA/FSA and dependent care FSA options.
  • Full-time, on-site position; eligibility and benefits vary by location and role.

Tech Stack

CSSCypressD3.jsGitHTMLJavaScriptNeo4jReactReduxTypeScriptWebpack

Categories

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About Twenty

51-200 employees
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