
In Progress
Posted
Paid on delivery
I have a mature C# WinForm desktop application that now needs both fresh functionality and a round of bug fixing. The codebase is neatly structured, lives in Git, and currently targets .NET Framework 4.8 inside Visual Studio 2022. New features: I will outline the exact screens and behaviours once we begin, but expect work such as adding extra dialogs, extending existing forms, and wiring in a few new workflow shortcuts. Bug fixes: the app intermittently throws runtime errors and has a couple of edge-case crashes that I can reproduce. I will supply steps and sample data so you can trace, patch, and prove each fix. You’ll have remote access to a test database, plus full source once an NDA is signed. Clean, well-commented commits and a brief change log are part of the hand-off. Deliverables • Updated source with added features implemented • All identified bugs reliably resolved • Compiled build ready for user acceptance • Short change log describing each update Write "OK" first in your bid If you’re comfortable diving into WinForms, C#, and standard debugging tools like VS diagnostics and dotMemory, let’s talk.
Project ID: 40381645
84 proposals
Remote project
Active 13 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs

mature apps are the tricky ones because you have to add new stuff without breaking what's already running. i'd start with a quick code review to map the existing structure, fix the bugs first, then layer in the new features on a clean base. done plenty of winform and wpf work, can start today. what's the new functionality you're adding?
$300 USD in 30 days
0.0
0.0
84 freelancers are bidding on average $181 USD for this job

OK, Working on an existing WinForms system like this is more about stability than just adding features. From your description, the key is to handle two things in parallel without conflicts: extending functionality and fixing intermittent issues that may be tied to deeper state or data conditions. We’ve worked on similar desktop systems where debugging runtime errors and handling edge-case crashes required careful tracing using Visual Studio diagnostics and memory profiling tools. I can share a relevant case example in chat if helpful. For your project, we would: Trace and isolate bugs using reproducible steps and logs Implement fixes with proper validation to avoid regressions Extend forms and workflows cleanly within your existing architecture Maintain clean, well-commented commits with a clear changelog You’ll also have a dedicated project manager ensuring communication stays smooth, and QA support to validate each fix before delivery. We focus on long-term maintainability, so your codebase remains stable even after adding new features. If helpful, I can review one of the reported issues and suggest the likely root cause before we begin. Let’s open a chat and walk through the first bug and feature scope together. ~Jenifer
$300 USD in 7 days
8.7
8.7

OK I checked your project description WinForm C# Enhancements & Fixes -------I believe I can do this project in an efficient and professional manner. I am Passionate .NET/Full stack developer having rich experience with all the latest technologies with so many successful Tasks. I have some queries to give you accurate time and price Please ping me to get started and provide you great results. Thanks
$359 USD in 7 days
7.1
7.1

Hello, OK I will implement the new dialogs, extend existing forms, wire workflow shortcuts, and resolve the runtime errors and edge-case crashes — delivering clean, commented commits with a change log per your requirements. For the intermittent crashes, I will attach VS Diagnostic Tools to capture exception snapshots and memory state at the point of failure — this pinpoints whether the issue is a disposed control reference, a threading violation, or a data-bound null, saving significant debug time. Questions: 1) Are any forms using background threads or async calls that might trigger cross-thread UI exceptions? 2) Is the test database SQL Server or another engine? Looking forward to potentially working together. Thanks, Kamran
$270 USD in 10 days
6.3
6.3

✅Hi, Client. I am a senior C#/C++ developer✅ I have successfully completed several projects similar like yours. I am interested in your project. I would like to work for you in the long term. Please send a message to discuss this project. I look forward to hearing from you. My main goal is to gain my client's satisfaction by completing a job with 100% accuracy I am a senior C#/C++ developer with over 10 years of rich experience in C#/C/C++/QT/Java/Python/Reverse Programming, API integration/Database management and Device Communication(RS232/485, Modbus). So, I can complete it within your timeline. Best regards! From Hien ...
$50 USD in 7 days
5.8
5.8

OK Hi, I have experience in C#, .NET Framework, WinForms, Visual Studio 2022, debugging, and desktop application maintenance. For this project, I am going to work directly inside your existing WinForms codebase to add the new screens and workflow updates cleanly, then trace and resolve the runtime errors and reproducible edge-case crashes using proper debugging tools and controlled test data so the final build is stable and ready for user acceptance. I have real hands-on experience maintaining mature desktop applications, fixing production bugs, and delivering clean Git-based updates with clear change logs, so I can step into an existing structured codebase and move efficiently without creating unnecessary risk. You can expect clear communication, fast turnaround, and a high-quality result. Best regards, Juan
$175 USD in 1 day
5.3
5.3

Hello, OK, I am focused on your project's needs and have a wealth of experience in C# programming and software development. My company, Our Software, has been building web services and applications for years, and we've consistently delivered clean, efficient, and well-structured code. This means that you can expect the same level of excellence in handling your mature C# WinForm desktop application. The fact that you've specifically mentioned a neat code structure and using Git makes my eyes light up. As an advocate for clean commits and thorough documentation, I'm keen on maintaining this standard throughout the project. I would be more than happy to dive deep into your codebase, identify sneaky runtime errors, and patch them up reliably while keeping you in the loop through a brief change log. Furthermore, having experience with different forms (new/additional/wiring) in WinForms and being comfortable with advanced debugging tools such as VS diagnostics and dotMemory will make me an invaluable asset as your go-to bug squasher. My proficiency in leveraging the latest technologies combined with an unwavering focus on providing excellent customer service ensures that no project is too big or small. Lions lead by sheep's motto aptly summarizes our approach; we are ready to turn your requirements into reality so that your business can reach new heights together. Let's discuss your project further to see how I can enhance your WinForm a Thanks!
$195 USD in 1 day
5.2
5.2

OK Hello, I am senior .NET developer. I can fix your WinForm application issues and make required Enhancements. Please contact me via chat and share more info for me Thank You
$300 USD in 5 days
4.9
4.9

OK ✋ Hi There!!! ✋ The Goal of the project:- Enhance and stabilize the existing C# WinForms application with new features and reliable bug fixes. I carefully read your requirements and understand you need someone to extend your current WinForms app with new dialogs and workflows while identifying and resolving runtime errors and edge case crashes using proper debugging tools. I am the right fit because I have strong experience maintaining and upgrading legacy desktop applications with clean and stable code practices. • Add new features including dialogs, form enhancements, and workflow improvements • Debug and fix runtime errors and reproducible crashes with proven solutions • Maintain clean Git commits with proper comments and detailed change log I also provide UI updates, database handling, testing, and full source code delivery with compiled builds. With 9+ years experience as a full stack developer, I have worked on WinForms applications improving stability and adding scalable features. Looking forward to chat with you for make a deal Best Regards Elisha Mariam!
$251 USD in 7 days
4.9
4.9

Ok Hello, I can fix the bugs and include fresh functionality in your mature C# WinForm desktop application. I am very comfortable in diving into WinForms, C#, and standard debugging tools like VS diagnostics and dotMemory. I would love to discuss the requirements in more detail via chat. I am looking forward to working with you, Fahad.
$150 USD in 2 days
4.6
4.6

OK Hello, I’m excited about the opportunity to enhance your C# WinForm desktop application. I understand you need to implement new functionality while addressing existing bugs, and I’m ready to assist you with both tasks effectively. With extensive experience in C# development and a strong background in WinForms, I have successfully added features and resolved critical bugs in similar applications. My proficiency with Visual Studio 2022 and debugging tools, such as VS diagnostics and dotMemory, ensures I can deliver quality results efficiently. To achieve your goals, I plan to: - Collaborate with you to outline the specific screens and functionalities you need, ensuring alignment with your vision. - Analyze and resolve the identified runtime errors and edge-case crashes, utilizing provided steps and sample data for accurate debugging. - Implement clean and well-commented code, following best practices for updates and documentation. - Provide you with a compiled build for user acceptance testing, alongside a detailed change log for transparency. I’m eager to begin this project and confident in my ability to meet your expectations and deadlines. Please let me know a suitable time to discuss further details.
$50 USD in 7 days
4.4
4.4

OK - mature WinForms apps usually do not break in the obvious places, they break where form state, event timing, and data bindings meet. A screen can look stable until a shortcut opens a dialog in a slightly different order or edge-case data leaves a control holding stale state. That looks correct during normal use, but fails in the exact repro steps you mentioned, so I would start by isolating those runtime paths before layering in new UI changes. The flow is: reproduce each crash with your steps and sample data -> trace form events, DB calls, and state transitions -> patch and verify each fix -> add the new dialogs, form extensions, and workflow shortcuts -> deliver a compiled build with a clear changelog. The part to get right early is the shared form-state and event sequence, because it affects both stability and confidence in every new enhancement. This comes together cleanly once that foundation is set right.
$300 USD in 7 days
4.5
4.5

OK! I'm Jairo Alberta, and I possess a wealth of experience in WinForms, C#, and the debugging tools you'll need for this project. Having proficiently used Visual Studio diagnostics and dotMemory in my previous work, I'm well-versed with identifying issues, addressing them efficiently, and delivering fixes in a precise manner. My skills will certainly come handy as we try to resolve the intermittent runtime errors and those edge-case crashes your application is currently experiencing. Apart from fixing the bugs, I'm capable of providing you exactly what you're looking for in terms of fresh functionality as well. I understand the importance of clean and organized codebase, like yours lives in Git; I have always documented my commits effectively to ensure easy understanding now and in the future. With my experience working on mature codebases as well as my ability to grasp workflows quickly, once you outline your expected features for me, we can get started right away without wasting time on explanations that should not be necessary. In addition to that full source access which enable me to trace down issues minutely and successfully provide fix on jedi way - traced - patched - proven! To sum it up, my extensive knowledge of C# WinForms combined with my ability to deliver high-performance solutions within specified timelines makes me the perfect fit for your project. Let's sign that NDA and make these necessary updates swiftly!
$200 USD in 7 days
4.5
4.5

OK Hello there, First I want to say this. Your project description is clear. You have a mature C# WinForms app. You need new features added and bugs fixed. You mentioned exactly what kind of new work you expect. Extra dialogs. Extended forms. New workflow shortcuts. I understand what you are asking for. I have done this exact kind of work before. I have added new dialogs to existing WinForms apps many times. I know how to design a clean form that fits with the old style. I have extended existing forms by adding new fields, buttons, and tabs without breaking what was already there. I have wired up keyboard shortcuts and menu items to speed up user workflows. This is not new to me. I can show you examples of similar WinForms work I have done in the past. One project I worked on was a warehouse management app built in WinForms. The client needed a new dialog for bulk updating inventory. I built the form, added validation, wired it to the database, and added a shortcut key so users could open it fast. The old code stayed stable and the new feature worked smoothly. That is how I approach every change. Add value. Do not break things. So ready to start after NDA. Let me know the next step. Best Regards.
$175 USD in 7 days
4.2
4.2

OK- Having worked with C# and .NET for over a decade, I possess the necessary skills and expertise to effectively enhance and fix your mature C# WinForm desktop application. I am well-versed in .NET Framework 4.8, Visual Studio 2022 and familiar with using Git for efficient code management. I am also experienced in working with remote databases, which means I can skillfully navigate your test database for effective debugging and patching. I understand that you need a full-stack developer, and I'm pleased to tell you that besides my extensive experience in backend systems, I have a solid background in frontend development as well – specifically with React.js and JavaScript – which can be advantageous in extending and adding extra features to your existing forms. My proficiency with debugging tools like VS diagnostics ensures quick identification of issues and their prompt resolution. Furthermore, my commitment to transparent communication and on-time delivery aligns perfectly with your expectations for clean commits, hand-off including a brief change log of each update. My comprehensive skill-set combined with my ability to provide end-to-end software solutions across web, mobile, API, CMS & database management makes me confident that I can provide youwith a solution that not only fixes all the bugs and crashes but also delivers the added features efficiently. Let's discuss your requirement further so we can get this project started seamlessly.
$100 USD in 7 days
4.3
4.3

OK Hello, I have experience with C# WinForms and .NET Framework 4.8 applications, including implementing custom dialog systems, extending form layouts with data binding, and debugging intermittent runtime errors through exception logging and memory profiling. I can trace your edge-case crashes using diagnostic tools, apply clean fixes with documented commits, and build out your new workflow shortcuts with maintainable code patterns. For the runtime errors, I would set up structured exception handling to capture stack traces and reproduce conditions systematically. Let's discuss!
$150 USD in 5 days
3.6
3.6

OK I can work on your C# WinForms (.NET Framework 4.8) application to add new features and resolve all existing bugs. I have strong experience with Visual Studio diagnostics, debugging runtime issues, and handling edge-case crashes. I will implement new dialogs, extend forms, and integrate workflow improvements as per your specs. All bugs will be reproduced, fixed, and verified with your provided steps and test data. Clean, well-structured commits and a clear changelog will be maintained throughout. You will receive updated source code and a compiled build ready for user acceptance. Comfortable working with Git, remote databases, and NDA requirements. Ready to start immediately.
$160 USD in 5 days
3.6
3.6

As a seasoned full-stack developer with honed skills in C# programming, I believe I possess the necessary know-how to enhance and resolve any issues within your WinForm application. With over five years of experience, I've demonstrated proficiency in navigating Git, VS diagnostics, and dotMemory -- essential tools in the kind of debugging you require. Combining my strong understanding of WinForms and C# with my comprehensive approaches to problem-solving, I am confident in my ability not only to fix known bugs but also identify and patch hidden ones throughout your application. I pay great attention to detail in every project, leaving no stone unturned when it comes to delivering a clean, well-commented codebase that's easily maintainable for future updates. Moreover, in my previous projects, I have consistently demonstrated the capability to rise to new challenges by delivering fresh functionality that aligns perfectly with project goals. My flexibility and adaptability extend beyond just C# work: they're combined with an excellent equally diverse skill set that includes Full Stack Development (my core focus), AI integration, automation, and database scripting among others. This means that beyond fixing those runtime errors you're experiencing, I'll be able to engage intelligently with the new features requirements. Let's press on OK
$150 USD in 2 days
3.6
3.6

Drawing from my 15 years of coding experience, I am perfectly positioned to tackle the task at hand. I have extensive knowledge of C# and WinForms, enabling me to navigate your codebase, extend existing forms, add dialogs and workflows proficiently. Moreover, I am adept in utilizing standard debugging tools such as Visual Studio diagnostics and dotMemory, so troubleshooting runtime errors and crashes won't be an issue. In terms of process management, I understand the importance of a clear channel for communication. To maximize efficiency, I propose discussing the project on call or chat with thorough deliberation on your project's budget and deadline. My commitment to prompt communication ensures that project development can be paced accordingly to avoid any unnecessary hitches. Finally, my approach to delivering a stable and commendable product aligns well with your needs. I believe in suggesting and asking questions where necessary to enhance the quality of the final deliverables. With access to your test database and source code guaranteeing you a transparent Git experience with well-commented commits, troubleshooting becomes easier while providing efficient solutions to get your desired results in a timely fashion. Let's get started!
$100 USD in 7 days
3.7
3.7

OK I’m comfortable working with mature C# WinForms applications on .NET Framework 4.8 in Visual Studio 2022. I can add new dialogs, extend existing forms, and implement workflow shortcuts while keeping the current structure clean and consistent. I have strong experience debugging intermittent runtime errors and edge‑case crashes, using Visual Studio diagnostics, logging, and memory profiling. Given your steps and sample data, I’ll trace each issue, apply a proper fix, and verify that it’s fully resolved. You’ll receive clean, well‑commented Git commits, an updated build ready for user testing, and a short change log explaining every modification. Once the NDA is signed and access is provided, I’m ready to start right away and dive into both features and bug fixes. Best, Shahbaz
$175 USD in 7 days
3.4
3.4

OK Hi, C# WinForms on .NET Framework 4.8 is very familiar territory and this is exactly the kind of work I do well. For the new features I am comfortable adding dialogs, extending existing forms, and wiring in workflow shortcuts. Once you walk me through the screens and behaviours I can estimate effort per feature accurately before touching anything. For the bugs, intermittent runtime errors and reproducible crashes in WinForms are usually traceable to threading issues, unhandled exceptions on background workers, or resource disposal problems. With your reproduction steps and sample data I will use VS diagnostics and dotMemory to isolate each issue, patch it cleanly, and verify the fix holds across the edge cases. I work with clean, well-commented commits and will maintain a clear change log throughout so the hand-off is straightforward. Happy to sign the NDA and get access to the source and test database whenever you are ready. What is your preferred timeline for the first deliverable?
$175 USD in 7 days
2.8
2.8

Sharjah, United Arab Emirates
Payment method verified
Member since Mar 9, 2024
$30-250 USD
$10-30 USD
$250-750 USD
$10-11 USD
$10-100 USD
₹37500-75000 INR
$1500-3000 USD
$30-250 USD
₹12500-37500 INR
€80-280 EUR
$250-750 USD
$30-250 USD
₹750-1250 INR / hour
₹12500-37500 INR
$30-250 USD
$8-15 USD / hour
$30-250 USD
₹750-1250 INR / hour
€12-18 EUR / hour
₹75000-150000 INR
$2-8 USD / hour
$30-250 USD
₹1500-12500 INR
€2-6 EUR / hour
$30-250 USD