Senior Frontend Developer

Who we are...

At Trustonic, we make smartphones affordable for the many, enabling global access to devices and digital finance through the world’s most secure smartphone locking technology. We partner with mobile carriers, retailers, and financiers across 30+ countries, powering device financing solutions that drive economic inclusion, profitability, and growth.

We pride ourselves on living by the Trustonic culture code, a blueprint for our journey that recognises that great working environments don’t guarantee success, but bad ones almost always ensure failure.

Working here, you’ll find a company that celebrates its diversity and is looking to do the right thing: for each other, the community and the planet. We believe in equal opportunities and take to heart the old African proverb ’If you only want to go fast, go alone. If you want to go far, go together’.

We work flexibly when and where we’re at our best, but regardless of how you choose to work, we’ll make sure you feel like one of the team.

Click here if you would like to find out more about Trustonic's culture code.

If you would like to work in a fast-moving global technology company, with great ambition, then we’d love to hear from you!

A bit about the job and what you’ll deliver…

As a Senior Frontend Developer, you'll take ownership of a modern React and TypeScript application, helping to shape its architecture and deliver high-quality, accessible and responsive features. You'll work across the frontend stack, from component design and application architecture through to build tooling, testing and integration with AWS Amplify and AppSync/GraphQL services.

You'll have the opportunity to make sound technical decisions, improve existing patterns and help set engineering standards across the frontend. Working closely with designers, backend engineers and Product, you'll deliver polished, production-ready features while continually improving performance, maintainability, developer experience and the overall quality of the platform.

Please note, this is a remote role with attendance required at our office in Winnersh from time to time.

What you’ll do…

• Design, build, and maintain production features in a React 18+ TypeScript application
• Own and improve our Vite-based development and build pipeline, including custom plugin configuration
• Design reusable, maintainable components and 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 application 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, providing 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 to deliver polished, production-ready features
• Contribute to improvements in developer experience, shared tooling, and reusable components

What we’re looking for…

• Demonstrable professional frontend development experience, with significant hands-on experience building production applications with React and TypeScript
• 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
• A strong testing mindset - you write tests because they provide confidence and help the team move faster
• Strong attention to accessibility, maintainability, performance, and user experience
• A pragmatic approach to engineering: you know when to improve an abstraction, when to keep things simple, and when not to over-engineer
• Strong communication and collaboration skills across engineering, design, and product
• A genuine interest in improving both the product and the engineering practices used to build it

Required Skills & Experience

Core Framework & Language

• 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

UI & Styling

• 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 working with interactive UI components such as colour pickers, forms, data tables, and complex controls
• Strong understanding of web accessibility and accessible component design

Routing

• Strong experience with React Router or a comparable client-side routing solution
• Understanding of nested routes, route-based code organization, protected routes, and navigation patterns
• Experience structuring larger React applications for maintainability and scalability

Data & Backend Integration

• Experience integrating React applications with AWS services, particularly AWS Amplify
• Working knowledge of GraphQL and experience consuming schemas in frontend applications
• Experience working with AWS AppSync or a comparable GraphQL backend
• Understanding of authentication and API integration patterns

Internationalization

• 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

Testing

• 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
• A strong focus on writing reliable tests that provide meaningful confidence

Code Quality & Tooling

• 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

• A degree in computer science, software engineering, or equivalent experience
• AWS certification is highly desirable but not essential

What we can provide you in return for your investment...

Competitive compensation

• A base salary that reflects your expertise and impact.
• Bonus scheme to share in our success.

Financial security & wellbeing

• Immediate participation in our pension scheme.
• Private medical insurance for you and your family from day one.
• Income protection and life insurance for peace of mind.

Flexibility & work-life balance

• Remote/hybrid working arrangements to support your lifestyle.
• An open holiday policy with no upper limit-take the time you need, when you need it.
• Support for volunteering and causes that matter to you.

Growth & development

• Opportunities for professional development and career progression.
• Exposure and interaction with global teams.

Inclusive, supportive culture

• A commitment to diversity, equity, and inclusion.
• A collaborative environment where your voice is valued and your wellbeing is prioritised.

Impact & purpose

• The chance to work on technology that drives global economic inclusion and makes a real difference in people’s lives.

Trustonic is an equal opportunity employer. We do not discriminate on any grounds. We empower, engage, enable and value differences between people, including; different races, ethnicities, genders, ages, religions, disabilities and sexual orientations, with differences in education, backgrounds, skill sets, experiences and knowledge.