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