About this role
Salary: £60,000 - 70,000 per year
Requirements
- Significant commercial experience in frontend software development
- Excellent TypeScript and modern JavaScript skills
- Strong knowledge of HTML, CSS and browser technologies
- Experience with the DOM, browser events, Shadow DOM and Custom Elements
- Strong CSS skills, ideally including Tailwind CSS and SCSS
- Experience developing reusable UI components, component libraries or design systems
- Familiarity with modern frontend build tools such as Vite, Rollup or esbuild
- Experience with automated frontend testing tools such as Playwright, Vitest or similar
- Good understanding of web security, accessibility and frontend performance
- Experience taking ownership of complex production applications
- Experience with Lit or other Web Component technologies is advantageous
- Experience with payment platforms, checkout systems or fintech applications is advantageous
- Knowledge of accessibility standards, including WCAG and ARIA, is advantageous
- Experience with PHP or Go backend applications is advantageous
- Experience with data visualisation or rich-text editing functionality is advantageous
- Experience with internationalisation and localisation is advantageous
- Contributions to open-source component libraries are advantageous
Responsibilities
- Design, develop and maintain modern frontend applications using TypeScript and JavaScript
- Build and enhance reusable Web Components and shared UI component libraries
- Develop merchant-facing applications, dashboards and secure payment interfaces
- Maintain and improve browser-based payment integrations and checkout functionality
- Champion frontend performance, accessibility, usability and cross-browser compatibility
- Modernise legacy frontend applications and migrate older interfaces to modern component-based solutions
- Work with UI/UX designers and backend engineers to deliver high-quality features and user interfaces
- Write clean, maintainable code supported by automated testing
- Contribute to frontend architecture, technical decisions and development standards
- Mentor other developers and promote engineering best practices
Technologies
- Backend
- CSS
- Frontend
- JavaScript
- PHP
- Playwright
- SCSS
- Security
- TypeScript
- Web
- UX UI Design
More
We are seeking a Senior Frontend Developer to join an established technology business specialising in payment infrastructure, transaction processing and enterprise software. Our products include business-critical payment platforms, merchant-facing dashboards, secure checkout solutions and shared UI component libraries. We take a modern, standards-based approach using TypeScript, JavaScript, Tailwind CSS and modern build tooling. The role is based in Portsmouth, Hampshire, with office attendance during probation and a minimum of three onsite days per week thereafter. The salary is £60,000–£70,000 plus benefits. Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy.
last updated 44 week of 2026