Skills: C#/.NET, WPF, GUI, Medical Device Title: Sr. Software Engineer Description: We are seeking a hands-on Software Engineer to join our team as an onsite contractor to support a critical Win Tablet application used in a hardware-integrated medical device. This role is highly execution-focused and ideal for someone who can jump in quickly, take ownership, and help stabilize and enhance a complex C# Windows application under active development. Responsibilities: • Develop, enhance, and maintain a C# Windows desktop application (currently WinForms) • Implement and refine user interface components, including graphing, waveform display, and high-performance visual updates • Diagnose and resolve performance issues in a multithreaded C# application (e.g., UI responsiveness, data jitter, throughput bottlenecks) • Work with real hardware (tablets/controllers), not just simulated environments; debug software/hardware integration issues • Collaborate closely with cross-functional engineers in a team environment • Write and maintain unit tests; help evaluate and improve testing strategies Qualifications: • Strong professional experience with C# in Windows-based applications • Experience with WinForms and/or WPF (or similar Windows UI frameworks); comfort working in Visual Studio designer tools • Solid understanding of multithreaded C# applications • Proven ability to diagnose and fix performance issues (profiling, identifying hotspots, bottlenecks, and practical limits of Windows applications) • Familiarity with .NET 10 or newer .NET runtimes • Experience with GitHub Actions and CI/CD workflows • Comfortable working with hardware-integrated systems (tablets, controllers, embedded-adjacent environments) • Strong communication skills and good documentation habits Additional Skills: • Working knowledge of C++/C • Experience working on medical devices or other regulated environment • Experience with modern Windows UI toolkits beyond traditional WinForms • Background in web or cloud technologies (useful longer-term, not required initially) • Experience working on systems involving waveform data, high-rate sampling, or real-time data flows