.Net Application Developer
6-month contract, hybrid, downtown Toronto
We are working with a client seeking a .Net Application Developer with strong legacy application development and maintenance experience. The ideal candidate will have expertise in designing, developing, maintaining, and modernizing enterprise-grade applications within the .NET ecosystem.
Key Responsibilities Develop, maintain, and troubleshoot legacy .NET applications, including Windows Forms desktop applications
Analyse existing codebases and application architecture to understand business logic, workflows, dependencies, and system integrations
Design and enhance application components using C#, .NET, Entity Framework, ADO.NET, and SQL Server
Work with multithreading, asynchronous programming, data binding, reflection, and Windows UI components
Integrate applications with Windows Services, hardware peripherals, printers, serial devices, COM components, and external systems
Develop and maintain APIs, database integrations, and data-persistence solutions
Support application deployments, cloud infrastructure, and CI/CD pipelines using AWS and Azure DevOps




Apply software design principles, including Domain-Driven Design (DDD) and CQRS, to improve application maintainability and performance
Required Experience Solid hands-on experience with C# and .NET application development, particularly legacy applications
Extensive experience with Windows Forms and desktop application development
Strong knowledge of SQL Server, Entity Framework, ADO.NET, and database integration
Experience with multithreading, asynchronous programming, data binding, and application performance tuning
Experience with Windows Services, COM Interop, P/Invoke, and hardware/peripheral integration
Experience developing APIs and integrating applications with external systems
Familiarity with AWS, Azure DevOps, CI/CD pipelines, and deployment processes
Strong troubleshooting, analytical, and problem-solving skills
Retail banking or financial services experience is an asset
isgSearch does not use artificial intelligence throughout the hiring process.

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📌 .Net Application Developer (Ontario)
🏢 isgSearch
📍 Ontario