Senior Frontend Developer

October 22, 2026

Hybrid

Senior

Winnersh, England, United Kingdom

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Mandatory office attendance

Description

Trustonic builds secure smartphone locking technology that enables device financing through mobile carriers, retailers and financiers in more than 30 countries. The company is hiring a Senior Frontend Developer to take ownership of a modern React 18 and TypeScript application, shaping its architecture and delivering accessible, responsive features. The role spans the whole frontend stack: component design, a Vite-based build pipeline, i18n, testing with Vitest and Testing Library, and integration with AWS Amplify and AppSync/GraphQL. The position is remote with occasional attendance at the Winnersh office.

Responsibilities

Design, build and maintain production features in a React 18+ TypeScript application
Own and improve the Vite-based development and build pipeline, including custom plugin configuration
Design reusable, maintainable components and the overall frontend architecture
Build accessible, responsive user interfaces using Ant Design and custom SCSS
Integrate frontend features with AWS Amplify and AppSync/GraphQL backends
Work with GraphQL schemas and client-side data-fetching patterns to deliver reliable features
Implement and maintain internationalization (i18n) across the application
Write and maintain high-quality unit and integration tests using Vitest, Testing Library and MSW
Identify and address frontend performance, usability, accessibility and maintainability issues
Contribute to and enforce engineering standards around linting, formatting, testing and pre-commit checks
Participate in code reviews and architecture discussions with thoughtful technical feedback
Help maintain frontend dependencies and contribute to security and vulnerability auditing
Investigate and resolve production issues and technical debt
Collaborate with designers, backend engineers and product stakeholders on production-ready features
Contribute to improvements in developer experience, shared tooling and reusable components

Requirements

Strong hands-on experience with React, including hooks, component composition, state management patterns and react-dom
Solid TypeScript experience building and maintaining production applications
Strong understanding of modern frontend architecture and application design
Experience with Vite or a comparable modern frontend build tool, including configuration and plugins
Familiarity with SVG asset handling and integrating frontend build tooling into a production workflow
Experience building production-quality interfaces with Ant Design, Material UI or a comparable component library
Strong CSS and Sass/SCSS skills, including shared styles, mixins, variables and build-tool integration
Familiarity with PostCSS, Autoprefixer and modern CSS build pipelines
Experience building responsive interfaces across different screen sizes and devices
Experience with interactive UI components such as colour pickers, forms, data tables and complex controls
Strong understanding of web accessibility and accessible component design
Strong experience with React Router or a comparable client-side routing solution
Understanding of nested routes, protected routes, route-based code organization and navigation patterns
Experience structuring larger React applications for maintainability and scalability
Experience integrating React applications with AWS services, particularly AWS Amplify
Working knowledge of GraphQL and experience consuming schemas in frontend applications
Experience with AWS AppSync or a comparable GraphQL backend
Understanding of authentication and API integration patterns
Experience implementing and maintaining i18n in production web applications
Familiarity with i18next, react-i18next or comparable internationalization frameworks
Understanding of language detection, translation management, interpolation, pluralization and locale-aware UI behaviour
Strong testing practices using Vitest, Jest or an equivalent test runner
Experience with Testing Library and user-focused component testing
Experience mocking APIs and network requests using MSW or comparable tooling
Familiarity with jsdom-based test environments
Experience configuring and maintaining ESLint, including TypeScript, React, React Hooks and import-related rules
Familiarity with dependency management, vulnerability auditing and frontend security practices
Understanding of CI-friendly development workflows and automated quality checks
Demonstrated ability to own features from technical design through implementation, testing, review and delivery
Ability to work independently in an established codebase while respecting and improving existing conventions
Strong architectural judgement and the ability to explain technical decisions and trade-offs clearly
Strong testing mindset with attention to accessibility, maintainability, performance and user experience
Strong communication and collaboration skills across engineering, design and product
Degree in computer science, software engineering or equivalent experience

Conditions

Full-time employment
Remote/hybrid working arrangements with attendance at the Winnersh office from time to time
Base salary reflecting expertise and impact, plus a bonus scheme
Immediate participation in the pension scheme
Private medical insurance for you and your family from day one
Income protection and life insurance
Open holiday policy with no upper limit
Support for volunteering and causes that matter to you
Opportunities for professional development and career progression
Exposure and interaction with global teams