Urgent Same-Day Fix: VB.NET/WinForms Real-Time Device Screen Viewer

We need a senior VB.NET/WinForms developer for a focused, same-day debugging and repair task. An existing consent-based remote-support application has a client screen-viewing section that should display the interface of an authorized Android test device. The viewer currently does not display or update the device screen correctly. Deadline The selected developer must: Start immediately after the Upwork contract begins Complete the task within four billable hours Deliver no later than August 19, 2026, 11:59 PM IST Apply only if immediately available today Technical environment VB.NET .NET Framework 4.8 Windows Forms WebSocket and JSON communication System.Drawing and Bitmap frame rendering Microsoft WebView2 Visual Studio on Windows Android/ADB familiarity is helpful Focused scope Build and run the existing Windows application Reproduce the broken viewer using an authorized test device Trace incoming screen data through decoding and UI rendering Identify whether the failure involves message routing, decoding, UI-thread synchronization, Bitmap disposal, frame timing, configuration, resizing, or orientation Implement the smallest safe and maintainable fix Verify that starting, stopping, and reopening the viewer works Avoid unrelated refactoring or feature development Acceptance criteria The authorized device interface appears in the viewer Screen frames continue updating without remaining blank or frozen The viewer operates continuously for at least 10 minutes without crashing Start, stop, and reconnect are demonstrated successfully The project builds successfully after the changes All modified source files and a short root-cause explanation are delivered through Upwork Budget and contract Contract type: Hourly Rate: $40 per hour Maximum time: 4 hours Maximum freelancer payment: $160 No additional hours without written approval through Upwork No unpaid test work is required Required expertise Strong VB.NET and Windows Forms experience .NET Framework desktop debugging UI-thread synchronization and asynchronous programming Bitmap or streamed-image rendering WebSocket message processing Visual Studio on Windows Ability to understand and repair an unfamiliar legacy codebase quickly Security and authorization This engagement is strictly limited to lawful, consent-based screen viewing on devices owned by us or explicitly authorized for testing. Unauthorized access, covert monitoring, credential collection, persistence, security evasion, and any functionality that could create a security hazard are outside the scope. A sanitized source branch containing only the required viewer, networking, and build components will be shared after the Upwork contract begins. Please answer these questions Are you available to start immediately and finish by 11:59 PM IST today? Have you fixed a VB.NET/WinForms real-time image or screen-rendering issue before? What experience do you have with UI-thread synchronization, Bitmap disposal, and WebSockets? Do you have a Windows machine with Visual Studio available now? Can you complete the initial diagnosis and repair within a maximum of four billable hours?