Staff / Principal Frontend Software Engineer

About the Company At Twenty, we're taking on one of the most critical challenges of our time: defending democracies in the digital age. We develop revolutionary technologies that operate at the intersection of the cyber and electromagnetic domains, where the speed of operations exceeds human sensing and complexity transcends conventional boundaries. Our team doesn't just solve problems – we deliver game-changing outcomes that directly impact national security. We're pragmatic optimists who understand that while our mission of protecting America and its allies is challenging, success is possible. Role Summary 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.

Who You Are You care about building software that has real-world impact in high-stakes environments. You lead with high standards and high support—clear feedback, strong mentorship, calm execution. You think in systems: performance, reliability, accessibility, and maintainability are first-class concerns. You make good tradeoffs under constraints and can explain them crisply to technical and non-technical partners. You enjoy turning complex data into intuitive workflows that help users make decisions quickly. You’re comfortable owning ambiguous problems end-to-end and driving them to measurable outcomes. You default to secure engineering practices and treat trust, safety, and correctness as non-negotiable.

What You'll Do 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.