Senior Full Stack Developer (Mobile & Backend Migration)

SUMMARY:
Senior Full Stack Developer working across Flutter mobile applications and backend systems

POSITION INFO:

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