Senior Full Stack Developer (Mobile & Backend Migration)
Datonomy Solutions Cape Town R 75,000 - R 90,000/month
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
- 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
- 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
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