Senior Mobile App Developer (Flutter/Dart)

About the role

Zenzero is a fast‑growing UK technology company looking for a Senior Mobile App Developer to lead the creation and delivery of cross‑platform applications for mid‑market clients. You will work closely with clients and internal teams to turn business needs into high‑quality mobile solutions.

Key responsibilities

• Lead the design, development and delivery of Flutter/Dart mobile applications for iOS and Android.
• Act as the primary technical authority for app development within the DDS team.
• Collaborate with clients and stakeholders to gather requirements and define solutions.
• Maintain and modernise legacy codebases, including migration to modern frameworks.
• Mentor junior and mid‑level developers on best practices.
• Contribute to technical planning, estimation and architecture decisions.

Required profile

• Minimum 5 years of commercial software development experience.
• Strong commercial experience building cross‑platform mobile apps with Flutter and Dart.
• Solid understanding of iOS and Android development principles and deployment processes.
• Experience working with legacy codebases and performing migrations.
• Proficiency in RESTful API design and integration.
• Comfortable using Git and collaborative development workflows.
• Excellent communication skills and ability to interact directly with clients.

Required skills

• Flutter
• Dart
• iOS development (Swift optional)
• Android development (Kotlin/Java optional)
• RESTful API design
• Git version control
• CI/CD pipelines for mobile deployment
• App Store and Play Store publishing
• Microsoft Azure or other cloud platforms
• UX/UI principles for mobile applications

What we offer

• Private health insurance
• Generous holiday allowance plus a day off on your birthday
• Flexible working patterns
• Enhanced pension contributions
• Regular social events across all offices