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Citi Logo Citi · IT - Software Development

Lead Frontend Developer (ReactJS), Assistant Vice President

United Kingdom, Belfast · Job Posted March 05, 2026
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Job Description

We are seeking a talented and passionate Lead Frontend Developer with deep expertise in ReactJS to spearhead the development of our cutting-edge user interfaces. The ideal candidate will be a technical leader, responsible for guiding the frontend team, defining architectural patterns, and ensuring the delivery of high-quality, performant, and intuitive web applications. This role requires a strong command of modern JavaScript, React ecosystem, and a commitment to best practices in UI/UX development.

Job Responsibility

  • Lead the design, development, and implementation of complex, scalable, and responsive web applications using ReactJS and its ecosystem
  • Define and enforce frontend architectural patterns, coding standards, and best practices to ensure consistency, maintainability, and performance across all frontend projects
  • Provide technical leadership, mentorship, and guidance to a team of frontend developers, fostering their growth and ensuring high-quality code delivery
  • Collaborate closely with UX/UI designers, product managers, and backend engineers to translate wireframes and designs into pixel-perfect, highly functional user interfaces
  • Oversee and conduct thorough code reviews, ensuring adherence to quality, performance, security, and accessibility standards
  • Optimize application performance, identify and resolve frontend bottlenecks, and improve overall user experience
  • Drive the adoption of new technologies, tools, and methodologies to enhance our frontend development capabilities
  • Stay up-to-date with the latest trends and advancements in frontend development, ReactJS, and web technologies

Requirements

  • Bachelor's or Master's degree in Computer Science, Software Engineering, or a related technical field
  • Professional experience in frontend web development, with at least 3 years in a lead or senior role focused on ReactJS
  • Expert-level proficiency in ReactJS, including a deep understanding of its core principles, component lifecycle, hooks, and state management libraries (e.g., Redux, Context API, Zustand)
  • Strong command of modern JavaScript (ES6+), HTML5, and CSS3, with experience in pre-processors (e.g., SASS, LESS) and styled-components or CSS-in-JS solutions
  • Demonstrable experience with frontend build tools (e.g., Webpack, Vite, Babel) and package managers (npm, yarn)
  • Proficiency in writing unit, integration, and end-to-end tests for frontend applications (e.g., Jest, React Testing Library, Cypress)
  • Solid understanding of responsive design principles and cross-browser compatibility issues
  • Experience with version control systems, particularly Git
  • Excellent problem-solving skills, strong analytical capabilities, and clear communication skills (verbal and written)

Nice to have

  • Experience with other JavaScript frameworks or libraries (e.g., Angular, Vue.js)
  • Familiarity with server-side rendering (SSR) frameworks like Next.js or Remix
  • Experience with GraphQL APIs
  • Knowledge of accessibility standards (WCAG) and implementing accessible user interfaces
  • Understanding of CI/CD pipelines and deployment processes for frontend applications
  • Experience with cloud platforms (e.g., AWS, Azure, GCP)
  • Familiarity with UI component libraries and design systems (e.g., Material-UI, Ant Design, Storybook)
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