Twenty Twenty Therapeutics

Twenty Twenty Therapeutics

Senior Frontend Software Engineer

Arlington, VA · Senior · Full-time

Sponsorship not specifiedDetected 105 days ago
JavaScriptTypeScriptReactHTMLCSSReduxwebpackViteCode ReviewGitCI/CDMachine LearningData VisualizationCybersecurityDesign SystemsAccessibilityCypressPlaywrightTest Automation

About the role

  • You write clean, precise, and well-tested code and hold yourself to that standard without being asked.
  • You make sound tradeoffs under constraints and communicate them clearly to teammates.
  • You're drawn to complex data problems and enjoy turning them into interfaces that help users act quickly.

Responsibilities

  • 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.
  • Collaborate with design, product, backend, and operations to deliver well-integrated features.
  • Support engineers through pairing and practical feedback on their work.
  • You think carefully about performance, reliability, accessibility, and maintainability as you build.
  • You take ownership of your work end-to-end - from design review to production - and take pride in delivering on your commitments.
  • You'll contribute meaningfully to frontend architecture and design decisions, own significant features end-to-end, and raise the quality of the codebase around you.

Requirements

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

Nice to have

  • You have experience with complex data visualization (e.g., D3.js, Chart.js, or similar).
  • You have exposure to graph databases or graph query patterns (e.g., Neo4j).
  • You have experience with real-time streaming data and live system visualization.
  • You have worked in defense, security, or other mission-critical domains.
  • You have built UI experiences that surface AI/ML outputs in operational workflows.

Benefits

  • Medical, dental, and vision plan options.
  • Life / AD&D, disability coverage options.
  • Paid parental leave for eligible full-time employees.
  • Paid holidays and flexible PTO.
  • HSA/FSA options, dependent care FSA.
  • Commuter benefits.
  • Building fitness center.
  • Desk setup stipend.
  • We consider all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, veteran status, disability, or any other protected status.
  • Benefits vary by location, role, and eligibility.

Company info

  • America is under sustained cyber attack.
  • Our adversaries infiltrate our networks, steal our IP, and degrade the digital infrastructure that modern life runs on.
  • They've learned-correctly-that those attacks rarely produce consequences.
  • Twenty was founded to change that, by making our adversaries think twice before they attack us.
  • Our vision is American and allied primacy in cyberspace-a future where they cannot contest us, deterrence is assured, and the free world remains secure.
  • Founded in 2024, Twenty Technologies (www.twenty.io http://www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies.
  • Headquartered in Arlington, Virginia, Twenty has raised $138M from Accel, Caffeinated Capital, Friends & Family Capital, Point72 Ventures, General Catalyst, and In-Q-Tel.

Equal opportunity

  • equal opportunity employer.
  • If you need a reasonable accommodation during the hiring process, let us know and we will work with you.

Visa & Work Authorization

  • Government security clearance
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This listing is sourced directly from Twenty Twenty Therapeutics's careers page and normalized into a canonical job model.