Senior UI Developer

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.

Clickhere 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!

We’re looking for a Senior UI Developer to take a leading role in building and evolving our operator web portal for a next-generation telecoms platform. You’ll create intuitive, high-performance user interfaces that power device lifecycle management at scale—working at the intersection of frontend engineering, real-time data, and secure cloud integrations.

This is a high-impact role where you’ll shape the user experience across a complex SaaS platform, collaborating closely with backend engineers and product teams to deliver seamless, scalable solutions. You’ll play a key role in translating sophisticated platform capabilities into elegant, usable interfaces for customers.

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

Design, develop, and maintain a React 18-based operator portal, delivering responsive and intuitive user interfaces.

Develop and maintain scalable component libraries using Ant Design, ensuring consistency and reusability across the platform.

Work with AWS App Sync Graph

QL APIs and Cognito authentication flows to deliver secure, real-time user experiences.

Implement efficient data-fetching and state management patterns (e.g., React Query, Zustand) for real-time device data.

Optimise applications for speed and scalability through code-splitting, lazy loading, and caching strategies.

Partner with backend engineers on API design and schema evolution, and contribute to UX and design discussions.

Write robust unit and integration tests using Jest and React Testing Library, and contribute to code reviews and best practices.

• Proven experience working with Graph
  
  QL APIs (App Sync, Apollo, or similar)
• Experience implementing authentication flows (e.g., AWS Cognito, OAuth2/OIDC)
• Solid experience using Type Script in a React codebase
• Familiarity with component libraries such as Ant Design, MUI, or similar

• Deep understanding of React 18 (hooks, context, performance optimisation)
• Strong skills in Type Script, including generics and scalable typing patterns
• Experience with modern tooling such as Vite or equivalent
• Knowledge of state management patterns (React Query, Zustand, or similar)
• Experience with testing frameworks like Jest and React Testing Library

• Experience with multi-tenant SaaS platforms at scale
• Familiarity with AWS services (App Sync, Cognito, S3, Cloud Front)
• Understanding of web performance optimisation techniques
• Awareness of accessibility standards (WCAG)
• Experience working with design systems and UX best practices

• Thrive in a fast-paced, collaborative engineering environment
• Strong attention to detail and passion for building high-quality user experiences
• Comfortable working…