Senior Web and Mobile Developer
Are you an experienced Senior Web and Mobile Developer passionate about building high-performance applications? Onyx, part of Activate Group, is seeking a skilled developer to create innovative solutions for the automotive repair industry. As a Senior Web and Mobile Developer, you’ll contribute to a next-generation Bodyshop Management System that empowers businesses with automation, real-time data insights, and seamless cloud-based performance. This full-time remote role offers excellent career growth, benefits, and the opportunity to work within one of the UK’s fastest-growing private companies.
About the Senior Web and Mobile Developer Role
As a Senior Web and Mobile Developer, you’ll deliver clean, maintainable, and high-quality code for both web and mobile applications. Working closely with design, backend, and QA teams, you’ll ensure the delivery of secure, scalable, and high-performing systems. You’ll lead by example, mentor junior developers, and champion best practices in usability, performance, and accessibility.
Key Responsibilities
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Develop and maintain responsive web and mobile apps using ReactJS, TypeScript, HTML, CSS, and Flutter.
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Build native Android apps and cross-platform solutions with MVVM architecture and Riverpod.
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Design and consume APIs with real-time communication (SignalR or similar).
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Implement on-device image processing and offline-first app functionality.
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Collaborate with designers and backend teams to ensure seamless integration and high usability.
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Conduct peer reviews, mentor team members, and document technical solutions.
Required Skills and Experience for Senior Web and Mobile Developer
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4+ years of professional web development (SaaS environment).
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3+ years of Android app development.
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Strong experience with ReactJS, TypeScript, Flutter, Firebase, and API integration.
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Knowledge of real-time messaging (SignalR) and secure coding practices.
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Excellent problem-solving, estimation, and communication skills.
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Experience working in Agile environments and using CI/CD pipelines.
Desirable Skills
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Experience with Angular or Vue.js.
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Familiarity with AI models, Docker, Kubernetes, or cloud platforms (Azure, Oracle).
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Knowledge of Microsoft .NET / C# and PostgreSQL (including JSON indexing).
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UI/UX design experience and agile project management tools like ADO or Jira.
Why Join Activate Group
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33 days holiday (including bank holidays).
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Health cash plan for dental and optical expenses.
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Enhanced parental pay and life assurance (3× salary).
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Free breakfasts, fruit, and birthday surprises.
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Flexible remote working and strong career progression opportunities.
Activate Group is recognized among the UK’s 100 fastest-growing private companies. We value innovation, teamwork, and continuous improvement, striving to make someone’s bad day better through technology and care.