Frontend Developer
Twenty is seeking a mid-level Frontend Engineer for an in-office position in its Arlington, VA office to help build the next generation of cyber technologies that protect democracies worldwide. We're looking for someone with 6+ years of experience in developing scalable frontend applications, with deep expertise in React.js, TypeScript, and modern web technologies, plus working knowledge of backend systems including Golang, graph databases, and cloud-native platforms. In this role, you'll design and develop sophisticated, high-performance user interfaces that visualize complex cyber operation data in real-time, creating intuitive dashboards and interactive experiences that help operators quickly understand and act on critical information from our graph-based cyber and electromagnetic systems. You'll join a world-class product and engineering team that delivers mission-critical solutions for U.S. national security, working in both cloud and on-premises environments to build systems that operate at machine speed. If you're passionate about solving complex technical challenges while making a direct impact on national security, we want to talk to you.
About the Company
At Twenty, we're taking on one of the most critical challenges of our time: ensuring democracies prevail in the digital age. We develop revolutionary technologies that operate at the intersection of cyber and electromagnetic domains, where the speed and complexity of operations exceeds human cognition. Our team doesn't just solve problems – we deliver game-changing outcomes that directly improve national security. We're pragmatic optimists who know that while our mission of defending America and its allies is challenging, we can succeed.
Role Details
Design and implement scalable full-stack solutions across our React frontend and Go backend services that enhance cyber operators' decision-making and response capabilities
Develop high-performance, real-time user interfaces that process and visualize complex cyber operation data streams
Create interactive data visualizations using D3.js, Chart.js, or similar libraries
Implement efficient data models and queries using graph databases to support complex relationship mapping
Implement responsive, accessible user interfaces that work across devices and screen sizes
Create and maintain automated testing suites to ensure system integrity and performance
Work with backend APIs and contribute to Go services when needed
Work closely with cyber operations experts to understand and implement features that enhance operator efficiency
Research and evaluate new technologies that could enhance our cyber operations capabilities
Qualifications
Technical Skills & Experience
6+ years of professional software development experience with full-stack applications
Expert knowledge of modern JavaScript/TypeScript, HTML5, and CSS3
Experience with frontend build tools, bundlers, and development workflows
Proven experience with GraphQL API design and implementation
Knowledge of web accessibility standards (WCAG) and performance optimization
Experience with frontend testing frameworks (Jest, React Testing Library, Cypress)
Experience with graph databases (Neo4j or similar)
Proficiency with cloud platforms, preferably AWS
Understanding of UX/UI principles and collaboration with design teams
Strong understanding of security best practices and secure coding principles
Education
Bachelor's degree in Computer Science, Software Engineering, or related fields, or equivalent practical experience
Security Requirements
Must be eligible to obtain and maintain a U.S. Government security clearance
Distinguishing Qualifications
Track record of delivering complex technical solutions in defense or security contexts
Experience with AI/ML integration in operational systems
Background in developing tools for cyber operators or security analysts
Experience with large-scale data processing and analysis
Additional Skills
Experience with Agile development methodologies
System architecture and design experience
Performance optimization and scalability experience
Open-source contributions or personal projects demonstrating relevant skills