Proven experience in a Senior Frontend or equivalent role (typically 6+ years). Strong expertise in modern frontend technologies, HTML5, CSS3, JavaScript/TypeScript, ES6+. Deep experience with modern UI frameworks (React preferred, but Svelte or similar transferable skills also considered). Strong capability in building scalable, data-rich applications and managing complex application state. Experience developing reusable component libraries or contributing to design systems. Proficiency working with RESTful APIs and integrating with backend services. Solid understanding of accessibility standards (e.g. WCAG) and how to implement them. Familiarity with testing tools such as Jest, Cypress, or Playwright for unit, E2E, and automation testing. Strong debugging skills with the ability to diagnose performance, rendering, and browser-related issues. Comfortable working in fast-paced, iterative environments with cross-functional teams. A proactive, self-driven approach with the ability to work independently and take ownership. Excellent communication skills, able to articulate decisions and collaborate effectively with technical and non-technical colleagues. A growth mindset, open to feedback, learning, and exploring new tools, frameworks, or approaches. Strong problem-solving skills, with a focus on delivering thoughtful and maintainable solutions. A team-first mentality, with the willingness to support others, share knowledge, and contribute to positive team culture. Adaptability and comfort working in evolving environments as the team grows and new technologies emerge. Eligibility for Security Check (SC) clearance.