Cape Town City Centre: Senior Full Stack Developer (Mobile & Backend Migration)

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