Staff Frontend SWE

Twenty•New York, NY

13d•Onsite

About The Position

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) industrializes offensive cyber operations for the U.S. and its allies. Headquartered in Arlington, Virginia, Twenty has raised $38M from Caffeinated Capital, General Catalyst, and In-Q-Tel. You'll own the frontend architecture for mission-critical operator experiences—building high-performance interfaces that visualize complex cyber operation data in real time. You'll lead technical direction for UI systems, set the bar for engineering quality, and mentor engineers to move faster with confidence. You'll partner closely with backend, product, design, and operational stakeholders to ship capabilities that must work reliably in both cloud and on-premises environments. You'll be embedded in a cross-functional team building capabilities that go directly into operational use — small team, tight feedback loops, real consequences.

Requirements

You have 8+ years of professional frontend software development experience.
You have deep expertise building production React.js applications with TypeScript.
You have strong command of modern web fundamentals (JavaScript/TypeScript, HTML, CSS).
You have led frontend technical initiatives and mentored engineers through delivery and growth.
You have experience building for performance at scale (profiling, optimization, rendering strategies).
You have experience with automated testing practices and frameworks (e.g., Vitest, React Testing Library, Playwright or Cypress for E2E).
You have hands-on experience with state management patterns and libraries (e.g., Redux, Zustand, or React Query).
You have strong collaboration skills with product and design to deliver excellent 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 Haves

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

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.

Benefits

Medical, dental, and vision plan options.
Life / AD&D, disability coverage options.
Paid parental leave for eligible full-time employees.
12 weeks for birthing parents, 4 for non-birthing parents, 6 weeks for adoptive, foster, or intended parents through surrogacy.
Paid holidays and flexible PTO.
401(k) with pre-tax and Roth options.
HSA/FSA options, dependent care FSA.
Commuter benefits.
On-site garage parking.
Bike storage.
Building fitness center.
Desk setup stipend.