Zenzero is one of the UK's fastest-growing technology companies. Named a Top 8 Technology Company at the British Business Awards 2026, recognised by Deloitte as a Best Managed Company, and featured in the Sunday Times Hundred (an annual ranking of the UK's fastest-growing private companies) in both 2025 and 2026, we hold Microsoft Solutions Partner status across all six designations, putting us in the top tier of UK Microsoft partners. The accolades reflect something real: a business that is scaling fast, executing well, and building something that lasts.
We're on a mission to make technology genuinely work for mid-market businesses, covering managed IT, cyber security, cloud, and AI solutions that actually move the needle. The demand is growing, and so are we. We're also a certified B Corp and Scale Up Award winner. That combination matters to us: high growth and high standards aren't in conflict here. Fast growth, high standards, real impact. If that sounds like your kind of place, keep reading.
About the Role
We are looking for a Senior Mobile Developer to lead the design, development and delivery of mobile and cross-platform applications within our DDS team. As the primary technical authority for app development, you will work directly with clients and internal stakeholders to understand requirements, shape technical decisions and deliver effective solutions.
This is an opportunity to combine hands-on Flutter and Dart development with technical leadership. You will modernise legacy application codebases where required, contribute to architecture and planning, and help junior and mid-level developers strengthen their app development practice.Responsibilities
Lead the design, development and delivery of mobile and cross-platform applications
Act as the primary technical authority for app development within the DDS team
Work with clients and internal stakeholders to understand requirements and deliver solutions
Maintain and modernise legacy application codebases where required
Mentor junior and mid-level developers on app development best practices
Contribute to technical planning, estimation and architecture decisions
Desirable:
Native iOS (Swift) or Android (Kotlin / Java) development
CI/CD pipelines and mobile app deployment (App Store / Play Store)
Microsoft Azure or other cloud platforms
UX/UI principles for mobile applications
Requirements
Minimum 5 years commercial development experience
Flutter / Dart — strong commercial experience building cross-platform mobile apps
iOS and Android development principles and deployment processes
Experience working with legacy app development technologies and codebase migration
RESTful API design and integration
Version control (Git) and collaborative development workflows
Strong communication skills — comfortable dealing directly with clients
Benefits
Private health insurance
Generous holiday allowance + a day off on your birthday
Flexible working patterns
Enhanced pension contributions
Regular social events across all our offices
Zenzero Solutions Ltd is one of the UK's fastest-growing technology companies delivering managed IT, cyber security, cloud, and AI solutions to mid-market businesses. The company holds Microsoft Solutions Partner status across all six designations, placing it in the top tier of UK Microsoft partners. Recognized as a Best Managed Company by Deloitte and featured in the Sunday Times Hundred in both 2025 and 2026, Zenzero combines high-growth scaling with high standards as a certified B Corp and Scale Up Award winner. The company is on a mission to make technology genuinely work for mid-market enterprises through solutions that deliver real business impact.
