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I'm looking for an experienced Visual Basic (.NET) developer to work on my existing website. The site is built on an old legacy version of VB.NET and needs bringing up to date. The work will include: Upgrading the project to the latest supported .NET Framework. Fixing existing bugs and issues. Improving performance and stability. Adding new features and improving existing functionality. General maintenance and ongoing support. I'm looking for someone who has worked with older VB.NET applications before and understands how to modernise legacy code without breaking the system. Please only apply if you have solid experience with: Visual Basic (.NET) ASP.NET SQL Server Legacy .NET applications When you apply, please send: A few examples of similar projects you've worked on. Your experience with VB.NET. Whether you're available for ongoing work. Your hourly rate or fixed price. This is not just a one-off project. I'm looking for someone reliable who can continue maintaining and improving the website long term.
Project ID: 40529864
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87 freelancers are bidding on average £518 GBP for this job

Hi there My name is Vijay and I am a seasoned Software Architect and Full-Stack Developer skilled in working with the Microsoft ecosystem which includes VB.NET, an essential requirement for your website upgrade and maintenance project. With over 20 years of experience in building scalable, secure, and performance-driven applications, I am confident in my ability to modernize your legacy code without disrupting its functionality. Over the course of my career, I have successfully upgraded numerous legacy .NET applications, utilizing my knowledge of the latest supported .NET Frameworks while still retaining the essence of the original system. This has enabled me to fix bugs, improve performance, add new features, and tackle existing issues effectively - all tasks that align perfectly with your project scope. Furthermore, it’s crucial to me that you receive not just a one-off service but long-term reliability coupled with continuous improvement. In addition to adapting to changing needs at a moment's notice and offering reactive solutions as new challenges arise. Trust me to increase efficiency for your systems through automation and provide smarter decision-making options as per your preference. Given this extensive alignment with your requirements, I look forward to discussing how we can partner together on this project and potentially add value to your business long into the future! Regards Vijay
£500 GBP in 7 days
7.9
7.9

Hi, this reads like a legacy ASP.NET maintenance job where the real value is reducing upgrade risk before changing code paths, and I’ve handled that kind of production stabilization work in existing systems. The main engineering risk is regression during framework modernization, especially when older application behavior is undocumented and tightly coupled to SQL Server queries, config, and page lifecycle assumptions. The closest example in my background is Custom Feature Development & Integration, where I started with a code walkthrough, mapped friction points, and made targeted changes with documentation and test coverage so the client could keep evolving the system safely. I’ve also done bug-localization work focused on isolating faults systematically rather than patching symptoms. I usually structure work in phases: baseline the current behavior, identify upgrade blockers, separate framework issues from application defects, then move through fixes behind a staging and verification path. That tradeoff matters because direct upgrades are faster only when dependency and behavior drift are low. For long-term maintenance, I’d first review the upgrade surface, risky flows, and stability bottlenecks, then sketch a safe modernization path. Thanks, Hercules
£500 GBP in 7 days
7.0
7.0

Hi, I’d be excited to help modernize your existing Visual Basic (.NET) web application. With over a decade of experience, I’ve successfully transformed numerous legacy systems into robust, user-friendly platforms. Key tasks will include: - Upgrading the project to the latest .NET Framework version. - Identifying and resolving bugs to ensure smooth operation. - Optimizing performance and enhancing system stability. - Implementing new features while improving existing functionalities. - Providing ongoing maintenance and support as needed. I have extensive experience with VB.NET, ASP.NET, and SQL Server. My background includes working on legacy .NET applications and successfully bringing them up to date without disrupting current functionality. I’ve completed several projects involving similar transformations and can provide references if required. I am available for long-term commitments and can start immediately. Please visit my portfolio at https://www.freelancer.com/u/reedsystems for more details. Looking forward to the opportunity to discuss this further! Reed Systems
£550 GBP in 10 days
6.4
6.4

Hi, I understand the importance of upgrading legacy VB.NET applications while maintaining system stability. I have extensive experience working with older VB.NET projects, including modernizing codebases without disrupting existing functionalities. My background includes upgrading projects to newer .NET Framework versions, fixing bugs, enhancing performance, and adding features to improve user experience. I have worked on similar ASP.NET and SQL Server-based applications, ensuring they run smoothly after updates. I am committed to providing ongoing support and maintenance to keep your website up-to-date and reliable. My approach involves careful code analysis, testing, and incremental updates to minimize risks. I am confident I can deliver the results you're seeking and be a reliable partner for long-term improvements. Best, Justin
£500 GBP in 7 days
6.7
6.7

Working with legacy VB.NET systems usually means the real challenge isn’t the upgrade itself but safely untangling years of incremental changes without breaking existing flows. I’d start by getting the solution running locally and mapping out dependencies across ASP.NET layers and SQL Server procedures so we have a clear baseline. From there, I’d upgrade the project step by step to the latest supported .NET Framework version, avoiding a big-bang migration to reduce risk. Once stable, I’d go module by module fixing bugs and tightening database calls where performance bottlenecks show up. After that, I’d introduce proper test coverage around critical flows and deploy through a staging environment with rollback in mind. In parallel, I usually trim unnecessary ViewState and optimize heavy queries, which often gives immediate performance gains. Ongoing, I’d stay on for maintenance and gradual feature additions as the system evolves. What hosting setup and IIS version are you currently running?
£500 GBP in 7 days
5.7
5.7

With extensive experience in revitalizing legacy VB.NET applications, I understand the importance of modernizing without disrupting the system. My past projects involve upgrading to the latest .NET Framework, bug fixing, and enhancing performance. Could you share more details on the current system architecture to better assess the scope of work required? Regards, Yogesh Kumar
£540 GBP in 8 days
5.3
5.3

⭐⭐⭐⭐⭐ Upgrade Your Legacy VB.NET Website with an Expert Developer ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project requirements and see you are looking for an experienced Visual Basic (.NET) developer. You don’t need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for VB.NET applications. I will upgrade your project to the latest .NET Framework, fix bugs, enhance performance, and add new features—all while ensuring the existing functionality remains intact. ➡️ Why Me? I can easily update your VB.NET website as I have 5 years of experience in Visual Basic, ASP.NET, and SQL Server. My expertise includes modernizing legacy applications, fixing bugs, and providing ongoing support. I have a strong grip on maintaining stability while enhancing functionality. ➡️ Let's have a quick chat to discuss your project in detail. I can provide samples of my previous work and demonstrate how I can meet your needs effectively. Looking forward to our conversation! ➡️ Skills & Experience: ✅ Visual Basic (.NET) ✅ ASP.NET ✅ SQL Server ✅ Legacy .NET Applications ✅ Bug Fixing ✅ Performance Improvement ✅ Feature Addition ✅ Ongoing Support ✅ Code Modernization ✅ Application Maintenance ✅ Problem Solving ✅ Team Collaboration Waiting for your response! Best Regards, Zohaib
£350 GBP in 2 days
5.4
5.4

Hello, this reads like a legacy ASP.NET maintenance problem where the real work is reducing upgrade risk while keeping the current site behavior intact. The main engineering risk is hidden coupling inside the existing VB.NET codebase, especially where framework upgrades expose dependency, session-state, or SQL Server behavior changes. I usually approach systems like this by stabilizing first, then modernizing in controlled layers rather than pushing a broad rewrite. That means identifying the pages and modules with the highest production impact, isolating breakpoints, and creating a safe path for framework and dependency updates. The closest work in my background is Enterprise ProxyTool Client App and Dent-Cloud, both of which involved evolving production systems with clear separation between critical runtime paths and changeable service layers. For a site like this, I recommend separating upgrade work from bug-fix work so regressions are easier to trace. I also typically review query hotspots, error patterns, and deployment assumptions early, since SQL Server behavior and older web app state handling tend to surface issues late. These are the kinds of systems I design for long-term production use, not one-off patches. If useful, I can start by sketching a safe upgrade and validation plan for the current application. Clifton
£500 GBP in 7 days
4.6
4.6

As an experienced Full Stack .NET Developer, I'm confident in my ability to upgrade and maintain your VB.NET website effectively. Having worked on numerous similar projects, I'm familiar with the intricacies and challenges that come with managing legacy code. By leveraging my solid foundation in VB.NET, ASP.NET, and SQL Server, I can ensure a smooth transition for your website to the latest supported .NET Framework. Honing my .NET skills since day one, I've developed a deep understanding of application architecture that includes both front-end and back-end. Drawing from my familiarity with various technologies like Node.js, React, Laravel, and Django as well as ASP.NET and SQL Server experience align with your project's requirements of upgrading to the latest technology while fixing existing bugs. Additionally, given my proficiency with other programming languages like C# - which shares similarities with VB.NET – I'm adaptable enough to learn new programming languages quickly if need be. Offering long-term support in maintaining and improving your website aligns perfectly with my commitment to delivering scalable and high-performance solutions to clients. Best Regards
£300 GBP in 5 days
4.8
4.8

Hi, Legacy VB.NET systems usually break not because of isolated bugs, but because older architecture, outdated dependencies, and tightly coupled logic make upgrades risky and performance improvements unpredictable. Your need to modernise while keeping the system stable shows the real challenge is controlled refactoring, not just adding new features, especially with ASP.NET and SQL Server dependencies still running business-critical workflows. I will upgrade the project to a supported .NET framework, stabilise existing modules, fix performance bottlenecks, and gradually modernise the codebase so new features can be added without risking existing functionality. Alongside that, I will structure it for long-term maintainability so ongoing updates and support become predictable instead of reactive firefighting. Do you currently have full source control access to the legacy system, or are there parts of the application that were not documented or versioned? Best Regards, Fizza Nadeem K
£250 GBP in 3 days
4.7
4.7

Hi, I have experience working with legacy VB.NET and ASP.NET applications, including upgrading older .NET projects, troubleshooting production issues, improving performance, and modernizing code while maintaining compatibility with existing systems. I can help review the current application, upgrade it to a supported .NET framework version, resolve bugs, optimize SQL Server interactions, and implement new features without disrupting existing functionality. I'm also available for ongoing maintenance and long-term support as the platform evolves. I'd be happy to review the current codebase and discuss the best upgrade path for your application. Muhammad Usman
£650 GBP in 3 days
4.2
4.2

As an experienced software engineer, I understand the intricacies of legacy systems like your VB.NET website. I have a solid background not just in VB.NET, but also in ASP.NET and SQL Server which are all integral to your project's success. In past projects, I've successfully upgraded websites to the latest .NET Framework, fixed bugs and improved performance- and I can do the same for you. My hourly rate is reasonable and I'm available for long-term work to ensure this project doesn't just achieve a one-off upgrade, but remains updated and stable into the future. What sets me apart from other bidders is my adaptability-I have an extensive background in various programming languages such as PHP, Python, C# which could be useful for any future expansion or needs your site may have. My DevOps experience means that not only can I write clean code- I can also automate maintenance tasks for your convenience. Let's work together to give your site a much-needed makeover while gaining a reliable partner for its ongoing improvement and support.
£500 GBP in 3 days
4.3
4.3

Hi, I understand you need a skilled VB.NET developer to modernize and maintain your legacy website. I've successfully upgraded older VB.NET projects to the latest .NET Framework, fixing bugs and enhancing performance while preserving existing functionality. My approach ensures stability and seamless integration of new features for ongoing growth. I’m confident I can support your site long-term with reliable, efficient maintenance and improvements. Ready to discuss your project details and timeline to get started. What specific performance issues or feature requests should we prioritize in the upgrade? Thanks,
£555 GBP in 21 days
4.4
4.4

Hi, We went through your project description and it seems like our team is a great fit for this job. We are an expert team which have many years of experience on .NET, Software Development, ASP.NET, Microsoft SQL Server, VB.NET, Web Development, Application Performance Monitoring, .NET Core, Database Management, .NET 5.0/6 Lets connect in chat so that We discuss further. Thank You
£750 GBP in 7 days
4.0
4.0

I’ve modernized and stabilized legacy VB.NET/ASP.NET apps on .NET 5/6 before—migrated from Framework 4.x, refactored DAL, swapped out deprecated SQL Server drivers—so this is right in my wheelhouse. My approach: I’ll incrementally migrate the VB.NET codebase to .NET 6, replace inproc SessionState with AddDistributedSqlServerCache, run static analysis on SQL queries to kill N+1s, then layer in lightweight APM via Application Insights for crash/perf telemetry before any new feature work. I’ll target zero-downtime deploys via blue-green in Azure App Service, validate with synthetic load tests in staging, and keep rollback scripts in Git for every commit. I maintain a private NuGet feed of core DLLs for reproducible builds. I can start immediately.
£550 GBP in 8 days
4.0
4.0

Hello, As a result of a detailed review of your project requirements, I fully understand the scope and expectations. I have experience handling similar types of projects and I'm available to start your project right now. I bring deep expertise in VB.NET, ASP.NET, .NET Framework, SQL Server, Legacy .NET Applications, Web Development, and Performance Optimization with over 10 years of experience. One of the key challenges in projects like this is modernising an older VB.NET website carefully, upgrading the framework and improving stability without breaking existing business logic, database connections, or live functionality. My approach would be to first review the current codebase, dependencies, SQL Server structure, and existing bugs, then plan a safe upgrade path to the latest supported .NET Framework. After that, I would fix priority issues, improve performance, add new features, and keep the system maintainable for long-term support. I have worked on legacy ASP.NET/VB.NET systems before and I am available for ongoing work after the initial upgrade and fixes. I would be glad to discuss further details, project examples, and pricing based on the current codebase. Looking forward to hearing from you. Best regards, Carlos
£250 GBP in 9 days
3.7
3.7

With over a decade of solid experience in Visual Basic (.NET) and ASP.NET, I am confident that I am the perfect fit for your website upgrade and maintenance project. Having worked extensively on legacy .NET applications and familiar with VB.NET, I understand the complexities and nuances involved in modernizing outdated code without jeopardizing its stability or functionality. One of the highlights of my career has been my ability to bring out-of-date systems up to speed with the latest supported .NET Framework. My skills extend to fixing bugs, enhancing system performance, adding new features, and reliably supporting websites long term - all of which align with your project needs. Especially noteworthy is my proficiency in Microsoft SQL Server which would be essential for maintaining your database-driven website. You need not worry about interruptions or inefficiencies because I would stay vigilant in spotting potential problems before they arise. In addition to that, I am committed to providing meticulous web development services with a keen eye on detail that ensures exceptional quality levels.
£700 GBP in 7 days
4.0
4.0

Hi, I have experience working with legacy VB.NET, ASP.NET, SQL Server, and older .NET web applications, including bug fixing, framework upgrades, performance improvements, and ongoing maintenance. For your website, I would first review the current project structure, .NET Framework version, database connections, deployment setup, known bugs, and any third-party dependencies. After that, I would plan the safest upgrade path, fix priority issues, improve stability, and make sure the site continues working correctly after modernization. My focus would be to modernize the application carefully without introducing unnecessary risk. I can also stay available long term for bug fixes, new features, database updates, performance monitoring, and general support.
£520 GBP in 5 days
3.6
3.6

I understand you need a VB.NET developer experienced with legacy systems to modernize your existing website. My recent project involved a similar scenario, where I successfully migrated a decade-old ASP.NET Web Forms application to .NET 6, improving performance by 40% and resolving critical stability issues by refactoring outdated components and updating database interactions. My approach will involve a thorough code audit to identify areas for improvement. I'll leverage Visual Studio's latest features and .NET's built-in performance profiling tools. For the upgrade, I'll follow Microsoft's recommended upgrade paths, focusing on incremental changes to minimize risk. Bug fixing will involve systematic debugging and unit testing. We'll utilize Git for version control and a CI/CD pipeline for streamlined deployments. To ensure alignment, could you share the current .NET Framework version and any specific challenges you've encountered with the legacy codebase? I'm eager to discuss how my expertise can deliver a robust and modernized website for you.
£631 GBP in 21 days
3.1
3.1

⭐ Hi there ! Let's set meeting schedule for ur project more detail . Legacy VB NET and ASP NET upgrades need careful hands because one small framework or SQL change can break old flows fast Similar work handled before was an old VB NET booking and admin site where bugs were fixed first then framework upgrade then SQL Server query cleanup For ur site the smart move is not a blind rewrite First step should be code review DB check and current bug list Then upgrade the safest supported NET version while keeping existing pages stable Performance can be improved with SQL indexing session cleanup caching and APM logs Available for ongoing maintenance after first upgrade Hourly rate can be discussed but fixed scope is also ok Timeline : 18 days Total Budget : £650 GBP Which NET Framework version is the site currently running
£650 GBP in 18 days
3.4
3.4

Leeds, United Kingdom
Member since Jun 21, 2026
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