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I maintain a legacy WinForms application built in Visual Studio with a SQL Server back-end, and I need a couple bug fixes and features improvements. Right now the pressing need is feature updates—specifically inside the business-logic layer. The job centers on adding new functionalities and refining several existing ones so the system continues to meet day-to-day requirements. You will dive into the C# codebase, work against our SQL schema, and push changes through our current Git workflow. Because the UI and database layers are stable for now, your focus stays on service classes, data access helpers, and any calculations that feed the forms. Deliverables I expect: • Updated business-logic code (C# / .NET Framework) checked in through client server • Clear in-code comments plus a short change log summarising each enhancement • Simple test harnesses or unit tests that prove the new and modified functions work If you have solid WinForms, SQL Server, and clean-code habits, and most of all experience in these legacy systems please bid.
Projektin tunnus (ID): 40278708
60 ehdotukset
Etäprojekti
Aktiivinen 2 kuukautta sitten
Aseta budjettisi ja aikataulu
Saa maksu työstäsi
Kuvaile ehdotustasi
Rekisteröinti ja töihin tarjoaminen on ilmaista
60 freelancerit tarjoavat keskimäärin $20 USD/tunti tätä projektia

Hi, there, As an experienced freelance engineer specializing in Visual Studio and WinForms applications, I am well-equipped to support and enhance your legacy WinForms app. With a strong background in C# programming, database management, and software development, I am confident in my ability to tackle the bug fixes and feature improvements required. ✅ Leveraging my expertise in C# and .NET Framework, I will update the business-logic code in your application to add new functionalities and refine existing features. ✅ I will thoroughly review the codebase, implement necessary changes, and ensure seamless integration with your SQL Server back-end. ✅ Developing clear, concise in-code comments and a detailed change log for each enhancement is a top priority to maintain clarity and consistency in the codebase. ✅ Additionally, I will create simple test harnesses and unit tests to validate the functionality of the new and modified functions, ensuring robustness and reliability. ✅ Lastly, I will adhere to your Git workflow, ensuring all changes are appropriately checked in and documented for seamless collaboration. I look forward to positively impacting your application's performance and functionality with my specialized skill set. Best Regards. Brayan
$25 USD 38 päivässä
5,8
5,8

Hello, Hope you're doing well! I am a .NET Developer specializing in robust backend systems, enterprise solutions, and scalable APIs. I help businesses streamline operations by building fast, secure, and reliable applications. What I Can Build 1. .NET Core REST APIs 2. Enterprise management systems (HR, CRM, Inventory) 3. MVC / Razor-based web applications 4. SQL Server database design & optimization 5. JWT authentication & role-based access 6. Cloud deployment on Azure/AWS 7. Reporting modules, logs, analytics Why Me? 1. Strong understanding of backend architecture 2. Clean, modular code that scales 3. Strong problem-solving & debugging 4. On-time delivery with clear documentation 5. Experience in both small & large enterprise systems Let's Discuss Send me your project requirements and I’ll provide: 1. Best backend architecture 2. Timeline breakdown 3. Project cost details Looking forward to delivering a powerful solution for you!
$20 USD 40 päivässä
5,9
5,9

Hi, I have extensive experience working with legacy WinForms applications and am skilled in enhancing business logic, ensuring updates align with your requirements. I will focus on refining existing functionalities and implementing the necessary bug fixes to improve your system's performance. What specific functionalities are you looking to prioritize in the feature updates? Best regards,
$25 USD 1 päivässä
5,3
5,3

Hi there, I understand the importance of maintaining and enhancing your legacy WinForms application, especially the focus on feature updates within the business logic. With extensive experience in C#, SQL Server, and a solid grasp of clean coding habits, I am confident in my ability to address your bug fixes and implement the necessary improvements. I have successfully navigated similar projects, ensuring the code remains robust and meets evolving business requirements. My approach involves diving deep into your existing codebase, making meaningful updates while adhering to your Git workflow. I will provide clear in-code comments and a concise change log summarizing each enhancement made. Furthermore, I will ensure that simple test harnesses are in place, validating that all new and modified functionalities work seamlessly before deployment. Let’s set a timeline to start this project as soon as possible to keep your application running smoothly. Would you like to discuss any specific functionalities or priorities in detail? What specific feature updates are your highest priority for this project?
$30 USD 27 päivässä
5,6
5,6

Hello! I am excited about the opportunity to work on enhancing the business-logic layer of your legacy WinForms application developed in Visual Studio with a SQL Server backend. I am well-versed in C#, .NET Framework, SQL Server, and have a strong background in maintaining and improving legacy systems. By diving into the codebase, collaborating with your team, and leveraging our current Git workflow, I am confident in my ability to deliver the required bug fixes and feature improvements efficiently and effectively. I look forward to the opportunity to contribute to the success of your project. Regards, antonk52
$18 USD 30 päivässä
4,2
4,2

Hi there! I understand you need updates and new features in your legacy WinForms application, especially in the business-logic layer, without affecting the stable UI and database. Keeping the application reliable while adding enhancements can be tricky. I have strong experience working with C#, .NET Framework, and SQL Server on legacy WinForms systems. I have delivered clean business-logic updates, implemented service class improvements, and added calculation-heavy features while maintaining full stability. I also have experience writing unit tests and clear change logs to ensure smooth future maintenance. My approach will carefully update and extend the logic layer, document all changes, and test thoroughly so that your application continues running flawlessly while new functionalities are added. I focus on precise, error-free work with minimal disruption to your existing system. Check our work https://www.freelancer.com/u/ayesha86664 Do you have a preferred timeline for these updates and feature improvements? Let me know if you’re interested & we can discuss it. Best Regards Ayesha
$20 USD 42 päivässä
4,2
4,2

Hello, I’ve spent years working with legacy WinForms apps on .NET Framework and SQL Server, focusing on clean business-logic layers, robust data access, and reliable tests. I’ll dive into your service classes, DAOs, and calculations that feed the forms, implement the requested bug fixes and feature updates, and ensure changes align with your Git workflow. I’ll add clear in-code comments and a concise changelog, plus lightweight unit tests or a test harness to prove correctness. I can start with a focused pass on the business-logic layer, then iterate based on feedback. If you want, I’ll provide a short integration plan and a first milestone within 2-3 days of kickoff. Please feel free to reach out to discuss details and timing. I’m looking forward to the chance of working together. Best regards, Billy Bryan
$20 USD 21 päivässä
3,7
3,7

Hi there, Regarding your project, I've noticed that many overlook the importance of optimizing database queries to enhance load times. By streamlining these processes, I ensure your system runs smoothly and efficiently, while delivering consistent performance. In a recent project, I revamped a client's database architecture, reducing query times by 40%, significantly boosting their app's responsiveness. As a bonus, I include 30 days of post-deployment bug-fixing to guarantee everything runs perfectly. What specific database system are you currently using? Let's discuss how I can help you achieve optimal results.
$15 USD 40 päivässä
3,5
3,5

Hi there, I maintain a legacy WinForms application built in Visual Studio with a SQL Server back-end and need a developer for targeted bug fixes and feature improvements. Clarification point: this engagement focuses strictly on the business-logic layer — the UI and database schemas are stable, so your work will enhance and refine service classes, data access helpers, and calculations feeding the forms. Scope of Work: Implement new business logic functionalities and refine existing ones Work directly in C# / .NET Framework against our SQL Server schema Follow our Git workflow to push changes safely Deliverables: Updated business-logic code with in-code comments Short change log summarizing each enhancement Simple test harnesses or unit tests demonstrating that new and modified functions work correctly Ideal candidate has strong WinForms experience, deep SQL Server knowledge, clean-code practices, and hands-on experience maintaining legacy systems. I have 12+ years of experience with .NET and legacy Windows applications, ensuring high-quality, maintainable solutions and smooth integration with existing systems. Please provide examples of similar work and confirm familiarity with legacy WinForms projects.
$15 USD 40 päivässä
3,6
3,6

Hi, I am a .NET developer with 8 years of rich experience in software development. I am familiar with C#, .NET Framework, WinForms, Microsoft SQL Server, Git, Software Testing, and Database Management. For this project, I will review the existing business-logic layer, implement the required feature updates and fixes in the service and data-access classes, and deliver clean commits with comments, a short change log, and simple test cases to verify the updated functionality. I'm an individual freelancer and can work on any time zone you want. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.
$15 USD 40 päivässä
3,1
3,1

I've worked extensively with legacy WinForms applications and have a solid grasp of C# and .NET Framework, particularly in enhancing business-logic layers. My approach involves diving deep into your existing codebase, carefully analyzing the SQL Server schema, and implementing the required feature updates and bug fixes. I will maintain a clean structure in the service classes and data access helpers, ensuring that all changes are well-documented with clear in-code comments and a concise change log summarizing each enhancement. To validate the modifications, I will create simple test harnesses or unit tests, ensuring that both new and existing functionalities perform as expected. I will utilize your current Git workflow for seamless integration of updates. With my experience in maintaining legacy systems and a commitment to clean-code practices, I am confident in delivering the enhancements you need.
$15 USD 40 päivässä
3,2
3,2

Hello, I have thoroughly analyzed your project requirements and identified that my core competencies in WPF, Agile Development, Microsoft SQL Server, Database Management, Technical Documentation, Software Testing, C# Programming, Git, .NET and Software Development align precisely with your technical specifications. With a decade of specialized experience in this domain, I bring proven expertise in implementing industry-standard methodologies and delivering production-ready solutions. My approach involves: - Technical Assessment: Comprehensive evaluation of project scope, technical constraints, and deliverable requirements - Strategic Planning: Development of detailed implementation roadmap with milestone tracking - Quality Assurance: Rigorous testing protocols and quality control measures throughout the development lifecycle - Timely Delivery: Proven track record of meeting deadlines while maintaining exceptional quality standards I am particularly adept at handling complex technical challenges and implementing scalable solutions that exceed client expectations. My methodology emphasizes precision, efficiency, and adherence to best practices in WPF, Agile Development, Microsoft SQL Server, Database Management, Technical Documentation, Software Testing, C# Programming, Git, .NET and Software Development. I would welcome the opportunity to discuss your project's specific technical requirements, timeline expectations, and success metrics in greater detail. Please feel free to sc
$20 USD 28 päivässä
2,5
2,5

You’re looking to update and refine the business-logic layer of a legacy WinForms application built in Visual Studio, focusing on C# service classes and data access helpers while working within an existing SQL Server back-end and Git workflow. Your priority is adding new functionalities and improving existing ones without altering the stable UI and database layers. With over 15 years of experience and more than 200 projects completed, I specialize in database design and backend development, particularly with Microsoft SQL Server and C#. My background includes maintaining and enhancing legacy systems, ensuring clean code, thorough documentation, and reliable testing practices. I will dive into your C# codebase, update the business logic with clear comments, and provide a concise change log along with simple unit tests to verify functionality. Working through your client-server Git setup, I’ll ensure smooth integration of changes with minimal disruption, aiming to deliver meaningful updates promptly. Let’s connect to discuss your specific feature needs and how I can help move this project forward efficiently.
$17 USD 7 päivässä
2,9
2,9

Hi, I’m confident I can help you implement the feature updates and bug fixes in your legacy WinForms application while keeping the SQL Server backend stable. With strong experience in C# WinForms, .NET Framework, and SQL Server, I focus on clean, maintainable business-logic code that integrates seamlessly with existing layers. I will start by reviewing the current business-logic layer and mapping the requested feature enhancements. Next, I will implement the new functionalities and refine existing ones, adding clear in-code comments and producing a concise change log. Finally, I will deliver simple test harnesses or unit tests to verify that all updates work correctly. You’ll receive updated, tested, and well-documented C# code, ready to deploy through your Git workflow without affecting the UI or database layers. Looking forward to collaborating, ?
$20 USD 40 päivässä
2,4
2,4

Hi there, I understand your WinForms application needs immediate enhancements in the business-logic layer, especially around service classes, data access helpers, and core calculations. For the past 5 years, I’ve been working extensively with legacy .NET Framework systems, SQL Server back-ends, and Visual Studio workflows just like yours, diagnosing logic flaws and implementing new features without disturbing stable UI or database layers. To handle your updates, I will review the relevant C# service classes, refactor or extend the logic as required, adjust SQL interactions, add clean comments, and prepare a concise change log. I will also create lightweight test harnesses or unit tests to validate the new functionalities. Before I proceed, quick question: Which specific business-logic functions or workflows are currently causing the most pain for end users? Best regards, Generoso III
$20 USD 1 päivässä
2,2
2,2

Hi, I’ve read your description and I’m confident I can update the business-logic layer of your legacy WinForms app. I have extensive C# experience working against SQL Server and maintaining stable UI and DB layers while refactoring service classes, data access helpers, and calculation logic. I’ll work directly in your Git workflow, add clear in-code comments, provide a concise changelog for each enhancement, and include simple test harnesses/unit tests to prove the changes. My approach is pragmatic and focused: I’ll reproduce the issue or verify the requested feature, write small, well-covered commits that preserve existing behavior, and refactor only where it improves readability and testability without risking UI or schema stability. I prioritize clean architecture, maintainable service boundaries, and reliable data handling so day-to-day operations remain uninterrupted. Can you share the specific business-logic areas or calculations you want changed first and any existing unit tests or test harnesses you currently use? Sincerely, Cindy Viorina
$20 USD 24 päivässä
2,1
2,1

✅Hello, I certainly understand your goal: enhancing the business-logic layer of your legacy WinForms application by adding new functionality, refining existing calculations, and ensuring everything continues to support your day-to-day operations smoothly. ✅My approach: I’ll dive into the C# service classes and data-access helpers, implement the required feature updates, and refine existing logic while keeping the UI and database layers untouched. All updates will be committed through your Git workflow, with clear in-code comments, a concise change log for each enhancement, and simple test harnesses or unit tests to verify the new and modified functions. I specialize in maintaining and improving legacy .NET systems, particularly WinForms applications backed by SQL Server. My experience includes updating business-logic layers, optimizing data interactions, and introducing maintainable, well-structured code while preserving system stability. I’ve previously improved legacy enterprise tools by extending service layers and refining calculation modules without disrupting existing UI workflows, ensuring reliable functionality and smooth deployments. Excited to strengthen and extend your application while keeping the system stable and maintainable!
$18 USD 40 päivässä
2,2
2,2

I can help you enhance your WinForms application by updating the business-logic layer and refining existing functionalities. With over 10 years of experience building similar systems, I understand the importance of maintaining clean and efficient code while ensuring smooth integration with your SQL Server back-end. I’m happy to dive into your C# codebase, implement the necessary changes, and provide clear in-code comments and a concise change log for everything I update. I can also create simple test harnesses to validate the new functionality. If you'd like, we can start with a small milestone to ensure I’m aligned with your expectations. I take this collaboration seriously and am here to answer any technical questions you might have. Let’s get started!
$15 USD 40 päivässä
1,4
1,4

Hello, thanks for posting this project. I am confident in my ability to design and refine legacy WinForms apps with a solid SQL Server backend. I will focus on the business-logic layer in C#, .NET Framework, implementing robust service classes, optimized data access helpers, and precise calculations feeding the forms. I will follow your Git workflow, add clear in-code comments, and provide a concise change log for each enhancement. I can also deliver simple unit tests or a lightweight test harness to prove the new and modified functions work. What are the top two business-rule changes you want prioritized in the updated logic, and do you have any preferred testing strategies for the new or modified functions? Looking forward to hearing from you. Warm regards, Vitalii.
$22 USD 10 päivässä
1,1
1,1

Hello , Thank you for posting your project. I am an experienced software developer with strong expertise in Agile Development, Database Management, Technical Documentation, Software Testing, Microsoft SQL Server, Software Development, C# Programming, Git, .NET and WPF. I have successfully completed similar projects and can deliver high-quality, scalable, and reliable solutions tailored to your requirements. I am confident I can help you achieve your goals efficiently and within your timeline. Let’s connect to discuss the project details, expectations, and next steps. Looking forward to working with you. Best regards, Osmel
$50 USD 32 päivässä
0,0
0,0

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