Senior C#/.NET Developer with enterprise desktop application, SQL Server performance tuning, WPF/MVVM, Web API, and complex workflow application experience Duration: 6 Months Location: Mississauga (Hybrid, 1-2x/week) Our pharmacy technology client is seeking a Senior C#/.NET Developer to support complex enterprise desktop application development, modernization, SQL Server migration/stabilization, and ongoing enhancement work across a large pharmacy/POS application environment.

The ideal candidate is a highly self-directed developer with strong C#/.NET, SQL Server, desktop application, API, and database performance experience who can quickly understand complex workflows, read technical/business documentation, and deliver in a fast-paced Agile environment with limited hand-holding.

Must Haves: 8+ years of hands-on C# / .NET development experience Strong experience building or enhancing complex enterprise desktop applications Strong SQL Server development experience, including query optimization and performance tuning Experience working with large applications involving c omplex workflows, multiple screens/modules,



and business logic dependencies Ability to read technical/business documentation and independently determine required development changes Strong problem-solving skills and ability to ramp quickly in unfamiliar application environments Experience with Web API / service integration Experience working in Agile delivery environments Solid communication skills; able to ask clear questions, process information quickly, and work proactively Azure Dev

Ops, source control, CI/CD, or similar modern development tooling Nice-to-haves: WPF / MVVM / Prism experience Experience modernizing or stabilizing legacy desktop applications Experience with POS, pharmacy, retail, inventory, claims, healthcare, or other complex transaction/workflow systems Experience supporting SQL migration, database remediation, or post-migration performance tuning Windows Services Dapper / LINQ Telerik Controls OAuth 2.0 RDLC / SQL reporting Application configuration, deployment, VM/local environment setup, or client installation experience

📌 Senior C#/.NET Developer with enterprise desktop application, SQL Server performance tuning, WPF/MVVM, Web API, and complex workflow application experience (Toronto)
🏢 S.i. Systems
📍 Toronto