Senior Full Stack Developer; Mobile & Backend Migration

Overview

We are undertaking a strategic migration of an existing mobile and backend product into a previously built, modernised platform. This role requires a hands-on Senior Full Stack Developer who is equally comfortable working across Flutter mobile applications and enterprise-grade backend systems.

The successful candidate will play a critical role in migrating functionality, APIs, and business logic from a Node.js + Angular backend into a Microsoft .NET (C#) environment, while ensuring continuity, performance, and maintainability.

This is a delivery-focused role, suited to a senior engineer who has led or executed complex system migrations and can operate with minimal supervision.

• Mobile (Flutter) - Maintain and enhance an existing Flutter-based mobile application
• Mobile (Flutter) - Support the migration of mobile features into the consolidated platform
• Mobile (Flutter) - Ensure consistent behaviour, performance, and UI parity during migration
• Mobile (Flutter) - Collaborate closely with backend engineers to align API contracts
• Backend & API Migration - Migrate backend functionality from Node.js + Angular into Microsoft .NET
• Backend & API Migration - Rebuild or refactor APIs using ASP.NET (C#) while preserving business logic
• Backend & API Migration - Translate existing Node.js services into clean, scalable .NET implementations
• Backend & API Migration - Work with LINQ and SQL Server to design and optimise data access layers
• Backend & API Migration - Ensure secure, performant API integrations with the Flutter mobile app
• Architecture & Quality - Analyse legacy codebases to understand dependencies and migration risks
• Architecture & Quality - Improve code quality, structure, and maintainability during migration
• Architecture & Quality - Contribute to architectural decisions and technical standards
• Architecture & Quality - Participate in code reviews and provide guidance to less senior developers
• Architecture & Quality - Ensure production readiness, stability, and scalability of the migrated system

• Flutter – strong experience building and maintaining production mobile apps
• Node.js – experience working with APIs and backend services
• Angular – experience with Angular-based web interfaces
• Microsoft .NET – strong experience with C#, ASP.NET, and LINQ
• SQL Server – writing, optimising, and maintaining queries
• Proven experience with system and platform migrations

• Experience migrating from Node.js to .NET
• Experience working in retail, logistics, or transactional systems
• CI/CD exposure and modern Dev Ops practices
• Cloud experience (Azure preferred)

• 7+ years software development experience
• Demonstrated full stack capability across mobile and backend systems
• Proven track record of delivering complex migrations
• Comfortable working in existing codebases and improving them
• Strong problem-solving and analytical skills
• Able to communicate clearly with technical and non-technical stakeholders

• Flutter
• Dart
• Mobile Application Development