Secure .NET Upgrade & Fixes

@Microlent

Your automation/integration system needs a secure .NET upgrade without breaking existing APIs, workflows, or production behavior—and the fixes must address root causes rather than introduce new regressions. I’ll handle this as a controlled migration: - Audit the solution, NuGet dependencies, authentication, configuration, API contracts, database access, and current build failures. - Upgrade the target framework and packages in safe increments, replacing deprecated or vulnerable components while preserving integration behavior. - Resolve compile-time and runtime issues, add focused regression tests around critical workflows, and validate error handling, logging, permissions, and data flow. - Deliver a clean build, documented changes, deployment guidance, and a concise list of any remaining risks so release decisions are straightforward. We built exactly this kind of integration for fitness with Vivahab, connecting smart-scale data to body-composition insights and personalized guidance, giving users an automated path from device readings to useful recommendations. We also delivered MYSP for business automation, combining people, technologies, and data within configurable workflows so organizations can coordinate processes with fewer manual handoffs and make better use of resources. Is the application currently targeting .NET 5, with .NET 6 as the required upgrade destination?

@mubeenm5026

Hi, I will migrate your C# application from .NET Framework 4.8 to the latest supported .NET, tighten security, and fix the UI issues. For your project, our team will: • Upgrade the solution to .NET Core/.NET, keep the build clean, and refactor obsolete APIs. • Update packages, remove vulnerable dependencies, and verify OWASP dependency-check shows no critical/high issues. • Enforce HTTPS, modern authentication, and stronger cryptography across the codebase. • Build a decoupled integration layer for REST and lightweight message-queue endpoints with testable interfaces. • Reproduce and fix high-DPI misalignments and control flicker, then validate behavior against the current build. Our .NET experience covers secure application modernization, API integration, and maintainable refactoring for production systems. I can work in a Git branch, commit frequently, and provide a clear migration report with removed packages and deployment notes. Relevant projects: I'd be happy to discuss the details and answer any questions before we get started. Looking forward to working with you. Best regards, Mubeen Web Crest

@nandasunny449

Dear Hiring Manager, I am excited to apply for your project. With 8.6+ years of experience in .NET Full Stack development, I have successfully built and maintained enterprise web applications, RESTful APIs, and scalable business solutions for clients across various industries. My expertise includes: Languages: C# Frameworks: ASP.NET Web Forms, ASP.NET MVC, .NET Core, WinForms, WPF, AngularJS, Angular 18 Frontend: React, JavaScript, jQuery, HTML5, CSS3, Bootstrap, AJAX, Figma to HTML/CSS APIs: REST APIs, Web API, WCF, Windows Services, Third-Party APIs, Facebook API Databases: Microsoft SQL Server, MySQL Payment Integrations: Stripe, WePay Tools: Telerik, DevExpress, Git, Bitbucket, Azure DevOps, SourceTree Testing: Selenium I am a reliable developer with strong communication skills and a proactive approach to problem-solving. Whether you need a new application, enhancements to an existing system, API integrations, or ongoing maintenance, I am confident I can deliver results that exceed your expectations. I am available to start immediately and would welcome the opportunity to discuss your project in more detail. Thank you for considering my application. I look forward to hearing from you. Best Regards, Sunny

@santhi75

Hi, I can help modernize your production C# application from .NET Framework 4.8 to a supported LTS .NET version while keeping security, stability, and maintainability as the priorities. With 20+ years of .NET experience across .NET Framework, modern .NET, C#, Web APIs, Entity Framework, Azure and enterprise applications, I’m experienced in legacy modernization and resolving compatibility issues without disrupting existing business logic. I’ll assess the current solution and dependencies, plan the migration, refactor obsolete APIs, update packages, and strengthen HTTPS, authentication and cryptography practices. I’ll also implement a clean, testable integration layer for REST services and, where practical, message-queue communication. For the UI, I’ll reproduce and troubleshoot the existing alignment/flicker issues, including high-DPI behavior, and verify that they are resolved after migration. I’ll work in a dedicated Git branch with frequent, meaningful commits and provide build/security validation, integration tests, and a concise migration report covering package changes and deployment steps. I’d be happy to review the current solution and provide a realistic migration plan, timeline, and milestones. Best regards, Santhi

@jagratip3

Hello, I have 10+ years of experience in .NET development and extensive experience upgrading and modernizing legacy C# applications, including migrations from .NET Framework 4.8 to modern .NET (LTS versions). I can handle the complete migration process, including dependency analysis and updates, obsolete API refactoring, security hardening, HTTPS configuration, authentication improvements, cryptography updates, and vulnerability remediation. I will ensure the upgraded solution builds cleanly with proper testing and documentation. I can also design and implement a clean integration layer for REST APIs and message-based communication while keeping the architecture modular, decoupled, and unit-testable. Additionally, I can investigate and resolve UI issues such as rendering glitches, control flickering, and high-DPI compatibility problems. I follow Git-based development practices with regular commits, clear branches, migration documentation, and deployment notes. I will provide a detailed migration report covering changes, updated packages, security improvements, and future deployment requirements. I look forward to discussing your current application architecture and migration roadmap.

@albertc1996

Hey this is exactly the kind of migration work I enjoy so happy to take it on I have strong hands on production experience with ASP NET and the broader NET ecosystem so migrating from Framework 4.8 to the latest LTS isn't just a version bump exercise to me it's something I approach methodically dependency by dependency and obsolete API by obsolete API rather than a lift and shift that quietly carries old problems into a new runtime Security being the primary driver here fits how I'd naturally approach it anyway I'd go through the codebase systematically enforcing HTTPS properly updating cryptography and authentication to modern standards and running dependency checks throughout the process rather than just at the end so critical and high issues get caught and resolved early not discovered right before delivery For the integration layer I'd build it as a clean decoupled module with well defined interfaces for REST and message queue endpoints keeping it unit testable and separated from your core business logic so future integrations don't mean touching the core system every time On the UI glitches high DPI misalignment and control flicker are usually rendering or scaling related issues that get exposed once you move off older Framework behavior so I'd track those down as part of the migration itself confirming they're reproducible on 4.8 and gone on the upgraded build rather than just patching symptoms I'll work in a Git branch commit frequently with clear messages and deliver a concise migration report covering what changed what was removed and any manual steps needed for future deployments

@agrasth

Dear Sir, I have more than 30 years experience in developing applications on .NET, SQL Server, .NET Core, Azure and related technologies. As far as we understand 4.8 is the last version of .NET. For further upgrade, the applications will need to be upgraded to .NET Core. Upgrade to .NET Core will mean a full overhaul of the application and its architecture. In case you need any clarifications, please feel free to contact us. Thanking you and best regards Sanjay Kaul

@technologiesit

Drawing from my 8+ years of Full Stack .NET development experience, I have the deep understanding and skills required to handle a comprehensive upgrade like yours. Starting with your key driver - security, I'll expertly migrate your application to a supported, more secure runtime while staying updated with the latest LTS release of .NET. I will meticulously update all dependencies and refactor any obsolete APIs giving you a clean, decoupled, and reliable codebase throughout. Aside from ensuring every aspect of your upgrade is methodically handled, I’ll also implement a solid integration layer for third-party systems using REST and queue endpoints without compromising on your application’s core logic. Meanwhile, I'll track down and resolve the flickering issues your UI has been facing to deliver an improved interface that operates seamlessly across high-DPI screens. Not only will I meet the specified acceptance criteria like zero critical/high issues in the OWASP dependency check but also commit frequently in a Git branch as you require. Additionally, I will provide you with a detailed migration report highlighting all the changes, removed packages, and any manual steps for future deployments which exemplifies my commitment to providing long-term technical support. Working together, we can truly elevate your .NET-powered application to align perfectly with modern security standards while enriching its functionality.

@ankitchopda186

Hi, I can help modernize your production C# application from .NET Framework 4.8 to the latest supported LTS .NET version, with security and maintainability as the primary focus. I have 13+ years of experience with C#, .NET, ASP.NET Core, Web API, Entity Framework, SQL Server, Azure, Microservices, authentication, and enterprise application modernization. For this project, I can handle: * Migration from .NET Framework 4.8 to modern .NET/LTS * Dependency and NuGet package upgrades with obsolete API refactoring * Security hardening, HTTPS enforcement, authentication and cryptography modernization * OWASP/dependency vulnerability assessment and remediation * Clean, decoupled REST/API and message-queue integration layer * Unit and integration testing * Troubleshooting and fixing high-DPI UI alignment/flickering issues * Git branch-based development with frequent, meaningful commits * Build/warning cleanup and regression testing * Detailed migration report covering changes, removed packages, and deployment steps I understand that this is a production application, so I would take an incremental migration approach to minimize risk and preserve existing business functionality. I am available for long-term/ongoing work and can start immediately. I would be happy to review the existing solution and provide a clear migration plan before implementation. Best regards, Ankit Chopada Senior/Lead .NET Engineer

@ammarahmed20

With 6+ years effectively managing complex projects and navigating through potentially arduous technical hurdles, I'm confident that I can seamlessly upgrade your production C# application to a more secure runtime with a clean integration layer. My background in API Development, C, and C++ Programming will come in handy while refactoring obsolete APIs, tightening HTTPS enforcement, and adopting modern authentication/cryptography practices, thereby fulfilling your primary driver: security. Moreover, I understand the significance of keeping the core logic decoupled and unit-testable during an upgrade. As a result of my work across various industries like Healthcare, Real Estate, E-commerce, and SaaS, I also appreciate the crucial value of well-documented interfaces and comprehensive testing. You can rely on me to not only build this integration layer for seamless communication with external systems but ensure it passes all basic end-to-end tests against sample endpoints.

@waqarinfo

Hi, I can help modernize your C# application from .NET Framework 4.8 to the latest supported LTS .NET release, with security and maintainability as the primary focus. With 11+ years of .NET experience, I can handle the full migration: dependency and package upgrades, obsolete API refactoring, HTTPS/security hardening, modern authentication and cryptography, and regression testing. I’ll also introduce a clean, decoupled integration layer for REST APIs and, where practical, message-queue endpoints using testable interfaces and dependency injection. I’ll investigate and resolve the existing UI alignment/flickering issues, including high-DPI behavior, and validate that they are reproducible on 4.8 but resolved after migration. I’ll work in a dedicated Git branch with frequent, focused commits and provide a concise migration report covering changed/removed packages, security improvements, deployment considerations, and any required manual steps. The final solution will build cleanly on the target runtime, pass security scanning with no critical/high findings, and include basic end-to-end integration tests. Best Regards, Waqar H

@Dinfo12

Given my extensive 8 years of overall programming experience and 3 years specifically working with .NET, I am well-suited to handle your project seeking a secure upgrade and fixes for your C# application. During my time as a Full Stack Developer, I have consistently ensured the software I develop is always up-to-date with the latest tools and frameworks for optimal security, performance, and maintainability. In particular, my expertise in .NET Core Api development can prove invaluable in ensuring smooth migration to your desired runtime. Additionally, I have vast experience in implementing clean integration layers, enabling seamless communication between the app and external systems. While maintaining feasibility for future deployments is a key priority, implementing modern authentication and cryptography practices will help fortify your application against vulnerabilities. Notably, as part of my process, I use Git extensively - committing frequently to ensure traceability and maintain efficient version control - this aligns perfectly with your requirement for a detailed migration report. Overall, my skills in ASP.NET combined with my commitment to producing high-quality work on schedule make me an ideal fit for this project. I look forward to starting immediately if chosen!

@sumitwebrainbows

As an experienced .NET developer with a strong focus on security, I believe I'm the right fit for your project. I have a deep understanding of .NET migration, upgrade, and secure authentication processes, and have successfully completed similar projects in the past. I ensure that my upgraded solutions reliably build and run on the target .NET version without any warnings or critical issues. Coming to modernizing authentication practices and tightening HTTPS enforcement, being adept at API development and backend integration, I possess sound knowledge of JWT authentication and can effectively implement these practices into your application. Regarding the UI glitches, I am skillful in frontend development with experience in building UIs for high-DPI screens using libraries like Tailwind CSS and Bootstrap. Combining this expertise with my commitment to producing clean code that aligns with MVC architecture guarantees that your application will not only function smoothly post-upgrade but also behave impeccably on your users' screens. My business ethic resonates strongly with your request to work in Git, commit frequently and maintain detailed documentation. My tech stack encompasses the complete lifecycle of web development, including devops skills that will make your deployment easier now and in future. In summary, I possess the skills required to meet your acceptance criteria ensuring your system compatibility step by step.

@mikes126

Hi there, let's have short meeting if you wanna quickly review the current .NET 4.8 codebase and upgrade path. I can migrate your C# app to the latest supported LTS .NET release, update dependencies, remove obsolete APIs, and fix security issues without breaking the existing core logic. I’ll focus on: • Secure HTTPS, auth and modern crypto practices • Dependency/security scan with no critical/high issues • Clean REST integration layer with unit-testable interfaces • Message-queue support where practical • High-DPI UI alignment/flicker fixes • Clean Git branch + frequent commits • Migration report with package changes and deployment steps • Build/test verification on the target runtime I’ll first audit the solution and dependencies, then upgrade in small commits so changes stay easy to review. Budget: $650 Timeline: 10 days

@dushyant317

We can modernize your .NET Framework 4.8 application by migrating it to the latest .NET LTS, updating all dependencies, replacing obsolete APIs, strengthening security (HTTPS, authentication, cryptography), and implementing a clean, testable integration layer for REST and message queues. We'll also resolve the high-DPI UI issues, maintain a clean Git history with frequent commits, and deliver a detailed migration report, updated documentation, and a production-ready solution that meets your security and performance goals.

@MShahzad102

Hi, Are you looking to modernize your C# application and ensure it meets current security standards? I can help with migrating your app to the latest LTS release of .NET while updating dependencies and refactoring any obsolete APIs. My plan is to secure your codebase by eliminating vulnerabilities, tightening HTTPS enforcement, and adopting modern authentication practices throughout. I’ll also create a clean integration layer for external systems, ensuring your core logic remains decoupled and unit-testable. Additionally, I’ll track down and resolve the UI glitches affecting high-DPI screens. The final solution will build and run without warnings, and I’ll include a migration report with all the necessary details. With over 5 years of experience in C# and .NET development, you can trust that I’ll deliver a solid and secure upgrade. Best Regards, Muhammad Shahzad

@dharmendra1981

I have around 14 years+ of experience with following skills:- ✔️ Language: C#, VB. ✔️ API integration: Web API, Web Services, Window Services, WCF, 3rd Party APIs, Rest API, WCF Service. ✔️ Database: MSSQL, MySQL,SQLite,MSAccess,DB2. ✔️ Framework: .NET, Winforms, ASP.NET Web forms, MVC, .NET Core 3.0, 3.1, 5.0, Angular JS, Angular 8, WPF. Azure, AWS ✔️ Front end: Asp.net, Javascript, Angular, jquery, HTML5, CSS3, Bootstrap 3/4, React ✔️ Payment Gateway: PayPal, Authorize.net. ✔️ Source Control: Git, VSS, TFS, DevOps, SVN. ✔️ Tools: DevExpress, Telerik, Kendo. I am a graduate Bachelor of Engineering in Computer Science.

@Rohitjadav12

Hi, I can help migrate your application from .NET Framework 4.8 to the latest .NET LTS while keeping the transition smooth and secure. I'll update dependencies, replace obsolete APIs, strengthen security, build a clean integration layer for external services, and resolve the UI issues you're seeing on high-DPI displays. I follow a Git-based workflow with regular commits and will provide a clear migration report along with any deployment notes. Happy to discuss the existing codebase and suggest the best migration approach. Thanks!

@sanddep5

Having worked extensively with .NET Core and ASP.NET, I am confident that I am the right person to guide your application through a smooth and secure upgrade. My experience in building scalable web solutions, as well as my full-stack development expertise (which includes UI/UX design), will enable me to address not only the immediate security concerns of your app but also the necessary integration layer with external systems. Implementing modern authentication protocols and cryptography practices will enhance your app's overall security, while also ensuring compatibility with prevalent industry standards. Furthermore, I can troubleshoot those persistent UI glitches, ensuring a consistent user experience on high-DPI screens. Your final acceptance criteria underscore the importance of meticulousness and robust documentation; rest assured, I prioritize both. By frequently committing on a Git branch while providing you with comprehensive migration reports and any manual steps needed for future deployments, I guarantee transparency and ease in managing your codebase even after our engagement ends.