Front-End Developer Location: London Working Pattern: Full-time (Hybrid 3 days onsite) Security Clearance: Must be eligible for SC and DV Clearance Salary : £52,000 - £72,000 10% bonus £7,000 tax-free DV Bonus Overview An industry-leading digital and cyber consultancy within the defence and national security space is seeking a Front-End Developer to join its growing National Security practice. This organisation brings together thousands of digital, cyber and intelligence specialists across multiple countries, delivering cutting-edge solutions that help governments and critical organisations unlock digital advantage in highly secure and demanding environments. This is an opportunity to work on mission-critical systems that directly support UK national security, within empowered engineering teams that value ownership, innovation and collaboration. The Role As a Front-End Developer, you will: Design, build and maintain modern, high-performance web applications Work within autonomous DevOps teams delivering secure, scalable solutions Collaborate closely with end users, UX designers and product teams Contribute across the full software delivery lifecycle Define and shape front-end architecture and technology choices Apply secure coding standards and best practices Implement automated testing with a shift-left mindset Support continuous integration and continuous delivery pipelines Contribute creative, innovative solutions to complex challenges Youll operate in small, empowered teams while being part of a larger engineering community that supports your professional growth. Required Skills & Experience Strong knowledge of vanilla JavaScript and modern ECMAScript standards Experience with JavaScript frameworks and front-end architecture design Deep understanding of the DOM, CSS, accessibility (ARIA) and form validation Experience with bundlers such as Webpack or Rollup Practical experience with Node.js and API integration Knowledge of Jest, Jasmine or similar testing frameworks Experience with Git and branching strategies Understanding of Agile delivery and CI/CD best practices Strong grounding in Computer Science fundamentals (OOP, data structures, design patterns) Experience applying secure coding principles Desirable 3 years front-end development experience TypeScript experience Responsive/mobile-first development Automation testing tools such as Cypress, Selenium or Playwright Exposure to backend development concepts Whats On Offer Flexible working arrangements with hybrid model 25 days annual leave plus buy/sell options Private medical and dental insurance Competitive pension scheme Annual bonus scheme Dedicated career development support and training platforms Access to diversity, inclusion and wellbeing networks Opportunity to work on nationally significant, mission-critical programmes The Environment Youll be joining a collaborative, people-first culture that combines the backing of a large global organisation with the feel of close-knit engineering teams. With decades of experience delivering secure technology solutions in the government and national security sector, this business continues to grow rapidly and invest heavily in its engineering capability. Summary This is a high-impact Front-End Developer role for engineers who want their work to truly matter. Youll build secure, scalable systems at the forefront of digital defence, work with modern technologies, and develop your career within a respected and growing national security practice. If you're motivated by complex challenges, secure environments, and meaningful technical impact this could be the role for you.