CustomerManager .NET 8 Bug Fixing, API Enhancement & Performance Optimization

@Microlent

Hello! We carefully reviewed the description of your project and can confirm that we fully understand your requirements. We are very interested in working on your CustomerManager system and confident in delivering stable bug fixes, API improvements, and performance optimization. With over 25 years of experience, our team has strong expertise in C#, ASP.NET Core (.NET 8), SQL Server, and EF Core. We have extensive experience debugging production systems, optimizing queries, improving API response times, and implementing caching, validation, and structured logging for reliable performance. We can fix the FooterLink issues, enhance API efficiency, ensure regression-safe testing, and provide clean deployment with proper documentation for handover. We are ready to start immediately and can ensure smooth execution with high-quality, production-safe code. Please review our profile here: https://www.freelancer.com/u/Microlent We would be happy to discuss your project in more detail via Freelancer chat. Best regards, Jasmin

@vishal1145

Your FooterLink delete bug and HTML upload issue point to a deeper problem - if your API isn't handling edge cases properly now, it'll fail harder when traffic scales. I've debugged similar issues in production .NET systems where missing validation caused cascading failures during peak loads. Quick question - what's your current average API response time, and are you seeing any N+1 query patterns in EF Core? Also, do you have Redis or any caching layer in place, or are we starting from scratch on performance optimization? Here's how I'll approach this: - C# + EF CORE: Refactor FooterLink delete logic with proper cascade handling and add HTML sanitization for uploads using AngleSharp to prevent XSS vulnerabilities. - SQL SERVER OPTIMIZATION: Analyze execution plans to eliminate table scans, add missing indexes, and rewrite queries that are causing your slow response times - I've reduced API latency from 2s to 300ms doing this before. - CACHING STRATEGY: Implement distributed caching with Redis for frequently accessed data and add ETag support to reduce unnecessary database hits by 60%. - VALIDATION + LOGGING: Add Fluent Validation rules and structured logging with Serilog so you can trace issues in production without guessing. - REGRESSION TESTING: Write integration tests covering the bug fixes and performance changes to ensure nothing breaks during deployment. I've spent 8 years maintaining legacy .NET systems for clients who needed zero-downtime fixes. I don't push code that hasn't been tested under realistic load conditions. Let's schedule a 20-minute call to review your current architecture and identify the highest-impact optimizations first.

@kapilasl

Hello, I am senior ASP.NET developer and server administrator. I can do you required .NET 8 Bug Fixing, API Enhancement & Performance Optimizations. Please contact me via chat and share more details for me Thank You

@jignesh06

As an experienced and skilled .NET developer with over a decade of experience, I understand the significance of API and performance optimization within existing production systems. Having worked on numerous web-based projects utilizing ASP.NET Core, SQL Server and EF Core, I'm confident in my capacity to swiftly and effectively fix the priority bugs in your CustomerManager system. My clean architecture understanding and proficiency in Git workflow will ensure that changes are implemented seamlessly without hindering current functionalities. My technical expertise extends to front-end magic with React, JS, Angular as well as back-end brilliance where I excel with Node.js, Express and .Net Web API. This comprehensive knowledge equips me to not only improve your API and web response time but also deploy clean code with validation, logging, proper error handling, thorough testing regimen and precise handover documentation. In essence, I'm more than equipped to optimize your system's performance, provide maintenance and create lasting value for your organization. With my dedication to on-time delivery, high-quality work and transparent communication - let's collaborate to turn your vision into a reality!

@anandan1995

Hello, I have read your job description and I am interested in your job post.I am ready to start now. Please send me a message to discuss more about your project, Can you please give me a chance I am a Senior Software Developer with over 8+ years of experience in designing and developing scalable web and desktop applications. I specialize in Microsoft technologies and delivering high-quality, secure, and performance-driven applications. My Expertise: Backend Development:ASP.NET, ASP.NET Core, MVC, Web API, WebForms, WCF Services Programming Languages:C#, Frontend Development:JavaScript, jQuery, AJAX, HTML, CSS Database Technologies:SQL Server, MySQL Reporting Tools:Crystal Reports, RDLC, SSIS, SSRS

@mayankinnovative

Hi, As per my understanding: You need a .NET expert to work on your existing CustomerManager system (ASP.NET Core .NET 8 + EF Core + SQL Server) to fix critical bugs, improve performance, and ensure production-grade stability with proper validation, logging, and safe deployment. Implementation approach: I will start by analyzing the current codebase to identify root causes of the FooterLink issues and fix them with proper validation and HTML handling. Then I’ll optimize APIs by refining EF queries, reducing payload size, and adding caching where beneficial. I’ll ensure robust error handling and structured logging for production safety. Regression-safe testing will be performed before delivery. Finally, I’ll assist with clean deployment and provide concise documentation for ongoing maintenance. Code quality and Git best practices will be maintained throughout. A few quick questions: 1. Is there staging access for testing fixes before production? 2. Current logging setup (Serilog, NLog, etc.)? 3. Any performance benchmarks or slow endpoints identified? 4. Preferred caching approach (in-memory or Redis)?

@mkh559a5a1fd66e9

With over 14 years of robust experience as a Full Stack Developer, I am your one-stop solution to getting the CustomerManager system back on track. Harnessing the power of C#, ASP.NET Core, SQL Server and EF Core, I have successfully resolved complex issues in multiple production codebases throughout my career, honing my debugging and optimization skills to deliver optimal performance. My mindful approach to writing scalable and maintainable codes assures a production-safe solution for you, fortified by robust capabilities like clean architecture understanding and Git workflow efficiency. Moreover, ensuring excellent response time for the web/APIs is one of my core strengths which can be accredited to thorough query optimization, payload cleanup and caching judiciously done while developing past projects. These optimization strategies combined with my expertise in integration with advanced AI capabilities will result in creating an efficient and potent system for you. Additionally, I can ensure quality assurance through diligent regression testing before delivery while comfortably supporting clean deployment practices. My commitment towards providing a smooth handover experience would culminate in high quality technical documentation.

@Tktech2

Hi, I have strong hands-on experience in ASP.NET Core (.NET 8), EF Core, SQL Server, and performance optimization in existing production systems, which makes this project a strong fit for my expertise. I can help you with: Fixing the FooterLink delete issue Adding HTML upload support in FooterLink Upsert Improving API and web response time through query optimization, payload cleanup, and caching Ensuring production-safe code with proper validation, logging, and exception handling Performing regression-safe testing before deployment Supporting clean deployment and short technical handover documentation I regularly work on bug fixing, SQL query tuning and ASP.NET Core performance improvements in live enterprise applications, so I understand how important safe changes and stability are. I'd be happy to review your existing CustomerManager codebase and start with priority issues immediately. Looking forward to discussing the details. Thanks, Tanima

@muhammadaqib53

Hi, I can efficiently fix and optimize your CustomerManager system (.NET 8 + SQL Server + EF Core) with a strong focus on production safety and performance. I have solid experience working on existing ASP.NET Core systems, handling bug fixing, query optimization, and API performance tuning in live environments. ? How I’ll handle your scope: Bug Fixes Resolve FooterLink delete issue (likely FK/state tracking issue) Implement secure HTML upload handling with validation/sanitization Performance Optimization Optimize EF Core queries (avoid N+1, use projections, indexing) Reduce payload size + introduce response caching where applicable Code Quality & Stability Add proper validation, structured logging, and exception handling Ensure regression-safe updates with controlled testing Deployment & Handover Clean Git commits, safe deployment support Short technical documentation for maintainability ? Why I’m a strong fit: Strong expertise in C#, ASP.NET Core, EF Core optimization Experience debugging production systems without breaking flows Focus on clean architecture and long-term maintainability I can start immediately and deliver fixes with minimal disruption, and I’m open to long-term support. Best regards, Muhammad Aqib Ali

@ngnsoftwareworld

Hi, I’ve carefully reviewed your requirement for improving and stabilizing the CustomerManager system, and I’m confident I can help you deliver production-safe, optimized results. I have strong hands-on experience with ASP.NET Core (.NET 8), C#, EF Core, and SQL Server, especially working on existing codebases that require debugging, performance tuning, and clean enhancements without breaking current functionality. I can fix the reported issues such as the FooterLink delete bug and implement HTML upload support in the Upsert flow with proper validation and security checks. Alongside bug fixing, I’ll focus on improving API and web response times through query optimization, payload reduction, and introducing efficient caching where needed. My approach always includes structured logging, robust error handling, and maintaining clean architecture practices. I follow a regression-safe workflow, ensuring all fixes are tested thoroughly before delivery to avoid impacting live users. I’m also comfortable with Git-based workflows and can support smooth, clean deployment. You’ll receive clear technical handover documentation so your team can easily maintain or extend the system further. I’m open to starting with a small milestone on an hourly basis and scaling into long-term support if needed. Looking forward to collaborating with you.

@MQamar123

As an experienced ASP.NET Core developer with over 7 years' expertise, my skill set is ideally aligned with your requirements for enhancing and optimizing the CustomerManager system. Not only am I proficient in C#, SQL Server, and EF Core, but more importantly, I strongly believe in creating clean and production-safe code by incorporating validation, logging, and thorough error handling - all priorities you've listed for this project. Moreover, I pride myself on delivering quality work within defined budget and timeframe. While providing a short technical handover documentation to smoothen post-project maintenance comes naturally to me. I'm no stranger to long-term commitment; hence beyond fixing the existing bugs & performance issues. I can also contribute proactively towards evolving your CustomerManager further.

@cheribin1210826

Hi. I 've read your description carefully. I have Backend development exp. If you hire me, I will do my best. Lets meet on chat.

@ttobio69

Dear Client, I have read all your requirements carefully, and I understand that you need an experienced .NET developer to work on your existing CustomerManager system built with ASP.NET Core .NET 8, SQL Server, and EF Core, with focus on bug fixing, API enhancement, and performance optimization. I have already worked on several similar production-grade backend projects before, including bug fixing in live systems, query optimization, API response improvement, validation, logging, and safe deployment workflows. With 8+ years of experience in this field, I am confident I can handle this work efficiently and cleanly. I can fix the FooterLink delete issue, add HTML upload support in FooterLink Upsert, optimize queries and payloads for better API/web performance, and improve reliability with proper validation, logging, and error handling. I also understand the importance of regression-safe testing and production-safe delivery in existing systems. I follow clean architecture principles, Git-based workflow, and structured handover practices, so you will receive stable code and clear technical notes after delivery. I can work on an hourly basis and would be happy to discuss the cost in detail based on the current issues and priorities. Best regards, Oluwatobi Okedairo

@henryw050

I'm a senior .NET developer with 7+ years of hands-on experience in C#, ASP.NET Core, SQL Server, and Entity Framework Core - including bug fixing, API optimization, and performance tuning in live production systems. I understand clean architecture, write regression-safe code, and follow a disciplined Git workflow so every change is traceable and reversible.I've worked on CustomerManager-style internal tools before - multi-entity CRUD systems with complex API layers are familiar territory. How I'd Approach This Step 1 - Codebase Review - Access the repo, understand the current architecture, reproduce both bugs locally, and map the API endpoints targeted for optimization Step 2 - Bug Fixes First - FooterLink delete and HTML upload issues fixed, tested, and committed cleanly before touching anything else Step 3 - Performance Pass - Query optimization, payload cleanup, and caching implemented on priority endpoints - benchmarked before and after Step 4 - Validation & Logging - Production-safe standards applied across all touched areas Step 5 - Testing & Handover - Regression testing complete, deployment support provided, and handover document delivered Question : Can you share read access to the repo and a brief description of how the FooterLink delete issue currently manifests - error message, HTTP status, or silent failure? Looking forward to hearing from you! Thanks

@nitisht3004

Hello, I reviewed your requirement for improving and stabilizing your CustomerManager system built on ASP.NET Core (.NET 8), SQL Server, and EF Core. This is exactly the kind of work I specialize in—enhancing existing production systems while ensuring stability. I have 7+ years of experience in .NET development, with strong expertise in debugging live systems, optimizing performance, and writing production-safe code. I understand the importance of making changes without breaking existing functionality. I will fix the priority bugs, including the FooterLink delete issue and HTML upload support in FooterLink Upsert, ensuring proper validation and security. I will then improve API performance through query optimization, payload cleanup, and caching where needed. Additionally, I will strengthen validation, logging, and error handling to make the system more reliable and maintainable. All changes will follow clean architecture practices and proper Git workflows. Before delivery, I will perform regression testing to ensure stability. I will also assist with deployment and provide concise technical documentation for handover. I am comfortable working with existing codebases and can quickly identify and resolve issues efficiently. I am also open to long-term support if needed. Best regards, Nitish Trivedi

@TonnyThe2nd

I am an experienced .NET developer with strong expertise in C#, ASP.NET Core (.NET 8), SQL Server, and EF Core. I can efficiently fix existing bugs, optimize performance through query tuning and caching, and ensure production-safe, clean, and well-structured code. I have solid experience working on live systems, focusing on stability, logging, validation, and proper error handling. I follow clean architecture principles and Git workflows, and I always perform thorough regression testing before delivery. I can also assist with smooth deployment and provide clear technical handover documentation. I am available to start immediately and open to long-term collaboration.

@wagdanm5

Hello, I have carefully reviewed the requirements for your CustomerManager system. As a specialized .NET 8 Developer with hands-on experience in C#, EF Core, and SQL Server, I am well-equipped to resolve your current bugs and significantly enhance system performance. How I will add value to your project: Precise Bug Fixing: I will immediately address the FooterLink delete issue and implement HTML upload support, ensuring that all fixes undergo Regression Testing to maintain system stability. Performance Engineering: I will optimize your EF Core queries (using techniques like AsNoTracking and Projection) and clean up API payloads to reduce response times and server load. Production-Ready Code: My approach follows Clean Architecture principles, incorporating robust validation, structured logging, and professional error handling to ensure a safe production environment. Seamless Deployment: I will follow your Git workflow and provide clear, concise technical documentation for the handover. Experience Highlights: I have developed and optimized large-scale desktop and web management systems, including POS and DVLD (Licensing System), focusing on high data integrity and UI responsiveness. Proposed Initial Milestone: I suggest an initial milestone of 15 hours to cover the priority bug fixes and a comprehensive performance audit of your core APIs. Looking forward to a long-term collaboration. Best regards, Wagdan Mohammed

@mudassir2433

Hi, I want to be upfront—I’m new to this platform and currently starting my freelancing journey. However, I bring 14+ years of real-world experience in C#, ASP.NET Core, .NET, SQL Server, and EF Core, and I’m committed to proving my value with high-quality work. I’d be a great fit for your CustomerManager system. I have strong experience working on existing production systems—fixing critical bugs, optimizing APIs, and improving overall performance and stability. For your requirements, I can: * Fix priority issues like FooterLink delete bugs and HTML upload support * Improve API/Web performance (query optimization, payload cleanup, caching) * Ensure production-safe code with proper validation, logging, and error handling * Perform regression-safe testing before delivery * Support clean deployment and provide clear handover documentation I follow clean architecture practices and write maintainable, well-structured code aligned with Git workflows. I’m happy to start with a small initial milestone to build trust and demonstrate results. Available to start immediately and open to long-term collaboration. Let’s connect and get started. Best regards, Mudassir

@habibabakr5

I’m a Software Engineer with 2+ years of hands-on experience working with ASP.NET Core, .NET (including .NET 8), SQL Server, and EF Core in real-world applications. I’ve worked on maintaining and improving existing systems, so I’m comfortable jumping into production code, identifying issues, and delivering safe, efficient fixes. For your CustomerManager system, I can: * Fix the reported issues (FooterLink delete bug and HTML upload support in Upsert) with proper validation and testing * Analyze and improve API and web performance through query optimization, payload cleanup, and caching strategies * Ensure production-ready code with structured logging, error handling, and clean architecture practices * Perform regression-safe testing to make sure existing features remain stable * Support smooth deployment and provide clear, concise technical handover documentation I have solid experience debugging complex issues in existing codebases and working with Git-based workflows. My focus is always on writing clean, maintainable code while ensuring performance and reliability. I’m available to start immediately and would be happy to begin with a small milestone to demonstrate my approach and quality.