Senior .NET Web Maintenance

@Microlent

Hi, Your project is exactly the kind of long-term .NET work my team handles regularly. We have experienced C#/.NET developers who are comfortable working with existing ASP.NET MVC/.NET Core applications, SQL Server, Entity Framework, Git, and CI/CD pipelines. We can quickly understand the current architecture, refactor legacy modules, develop new features, optimize SQL queries and stored procedures, and deliver clean, maintainable code with proper testing and documentation. Our in-house team also uses AI-assisted development tools to speed up delivery while maintaining code quality, helping us provide competitive pricing without compromising standards. I'm available to start immediately after project confirmation and can provide dedicated ongoing support for future enhancements as well. Looking forward to discussing your backlog and becoming your long-term development partner.

@akshaybhagwat76

Hi, Maintaining and evolving a live production codebase is exactly the kind of work I do daily — not side projects, but real systems with real users depending on them. I have 8+ years with C#, ASP.NET MVC, .NET Core, Entity Framework, and SQL Server. At Luxoft, I stepped into an existing enterprise platform mid-flight, refactored legacy modules, optimized slow T-SQL queries, and shipped new features without breaking what was already working — same scenario you're describing. Legacy code doesn't scare me. I've migrated .NET Framework 4.x codebases to .NET Core, untangled spaghetti stored procedures, and introduced clean architecture patterns incrementally without disrupting live deployments. My SQL Server work covers query tuning, execution plan analysis, index optimization, and stored procedure rewrites that actually move the needle on performance. For new features, I follow established patterns in the existing codebase first — no unnecessary rewrites, no framework churn. PRs come with clear notes, self-explanatory code, and unit tests using xUnit and Moq. CI/CD green lights are non-negotiable for me before any merge. Knowledge transfer is something I take seriously — I document what I change and why, so the next developer isn't left guessing. I'm available to start immediately. Share the repo or a brief module overview and I can give you a realistic first-week plan.

@AbdulBasitAli045

I’m excited to apply for your project and bring my expertise in .NET and backend development to help you build secure, scalable, and high-performing applications. With 8 years of professional experience, I specialize in designing, developing, and maintaining backend systems that drive business success. My Expertise Includes: ✅ .NET Development Building robust applications using ASP.NET Core MVC, Web API, and WebForms. Implementing RESTful APIs and integrating with third-party services. Developing reusable libraries and middleware for modular systems. ✅ Backend Architecture & Database SQL Server, MySQL, and PostgreSQL – query optimization, stored procedures, and indexing. Entity Framework & Dapper for efficient ORM solutions. Designing scalable database schemas and implementing caching strategies. ✅ Cloud & Integrations Deployment and integration with Azure and AWS services. Authentication/Authorization (JWT, OAuth, Identity Server). Payment gateways, email services, and external API integrations. ✅ Best Practices & Performance Clean code architecture (Onion/Clean Architecture, Repository & Unit of Work patterns). Exception handling, logging (Serilog, NLog), and monitoring. CI/CD pipelines for smooth deployment.

@vinod150987

Hi, I’m a senior .NET developer with over 10 years of hands-on experience building, maintaining, and enhancing ASP.NET applications backed by SQL Server. Much of my work has involved stepping into established production systems, understanding existing architecture, and delivering new features and improvements without disrupting day-to-day operations. I am comfortable working with mature codebases where understanding existing business logic is just as important as writing new code. When introducing new features, I focus on maintaining consistency with established patterns, improving maintainability, and minimizing technical debt. On the database side, I have extensive experience analyzing slow-running queries, reviewing execution plans, optimizing stored procedures, and implementing indexing strategies to improve application performance. Best regards

@mandavcon

Hi, I checked your requirement and this aligns well with my experience. I have more than 10 years of hands-on experience in C#, ASP.NET MVC, ASP.NET Core, SQL Server, Entity Framework, Angular, React, and maintaining enterprise applications in production environments. I understand this is not a new build but an existing live application that needs ongoing development, refactoring, performance improvements, and clean feature delivery without affecting current users. My experience includes: Working with mixed ASP.NET MVC and .NET Core applications Refactoring legacy code while preserving existing functionality Designing and implementing new modules SQL Server optimization, stored procedures, indexing, and query tuning Entity Framework performance improvements REST API development and integrations Unit testing and maintainable architecture Git workflow, pull requests, and CI/CD processes I am comfortable reviewing existing modules, understanding current patterns, improving maintainability, and delivering production-ready changes with proper testing and documentation. I focus on readable and scalable code rather than excessive comments and maintain clear PR notes to simplify reviews and future handovers. Once I review the current architecture and backlog priorities, we can discuss milestones, timeline, price,and implementation approach in detail. Looking forward to discussing the project.

@Rajib143

Hi, I've built and maintained multiple production .NET SaaS platforms, including a digital signature platform (DocSignerHub) with multi-provider API integration. Your PostZam requirements — particularly OAuth lifecycle management, per-platform rate limiting, and failure isolation across social APIs — align directly with the kind of distributed resilience patterns I architect daily. I've worked extensively with .NET 8/10, Blazor, and PostgreSQL on cloud deployments. The Google Gemini multimodal API integration for AI captions is particularly interesting — I've integrated multiple LLM APIs (OpenAI, Gemini, DeepSeek) into production systems and understand the nuances of handling multimodal inputs at scale. A few questions: What's your current pain point with the existing API integrations — is it primarily token refresh failures, rate-limit 429s, or upload reliability? And do you have monitoring/alerting in place for per-platform failure detection, or is that part of what you need built?

@technologiesit

With over a decade of solid experience under my belt and having successfully delivered a varied range of projects incorporating cutting-edge digital solutions much like yours, I believe I am well-equipped to take on your Senior .NET Web Maintenance assignment. My forte is providing long-term support in the form of website maintenance, something I deduce your project could highly benefit from. For me, it's about ensuring the seamless functioning of your application, enabling businesses like yours to thrive efficiently. I fully understand the importance of maintaining existing codebases, and that perfectly aligns with my skillset in reading and refactoring legacy code, which is pivotal if we aim to facilitate responsiveness and efficiency. I value the time of my clients; therefore, submitting pull requests with thorough explanations is a practice I religiously follow to make the code review process smooth-sailing for everyone involved. Your desire for top-notch performance means that you'll find great value in the fact that I have an extensive background integrating and optimizing T-SQL that thrives under heavy usage. Even more so, my ingrained habit of writing profound unit tests and clear-comment light codes will help ensure maintainability and efficient processes. Let's partner up on this project; I guarantee builds free from bugs, peer-approved outputs, and confident knowledge transfer ∀+

@mykhaylob4

✋ Hi there. I can support and extend your existing ASP.NET application, helping improve maintainability, performance, and feature delivery while working comfortably within an established production codebase. ✔️ I have solid experience working with ASP.NET MVC, .NET Core, C#, SQL Server, Entity Framework, REST APIs, Git workflows, legacy system maintenance, and performance optimization. In previous projects, I have taken over live business applications, refactored older modules, improved database performance, and implemented new features without disrupting existing users. ✔️ For your project, I will review the current architecture, identify areas for improvement, optimize SQL queries and stored procedures where needed, and develop new features that follow your existing patterns. I am also comfortable working through pull request reviews and maintaining clean version control practices. ✔️ I will focus on writing maintainable code, adding appropriate test coverage, keeping deployments stable, and providing clear handover notes so future developers can easily understand the changes. Let’s chat to discuss your project in detail. Best regards, Mykhaylo

@ddtechz

Hello, I’m a Senior .NET Developer with 7+ years of experience working with ASP.NET MVC, .NET Core, C#, SQL Server, Entity Framework, and Git-based development workflows. I have extensive experience maintaining and enhancing live production applications, including refactoring legacy code, developing new features, optimizing SQL queries and stored procedures, and ensuring clean, maintainable code without impacting existing functionality. I am comfortable working within established architectures, following coding standards, contributing through pull requests, and supporting CI/CD processes. I can quickly understand the existing codebase and start delivering improvements efficiently. I’d be happy to discuss the project requirements, timelines, and milestones further. Thanks, Deo

@ssquare489

As a seasoned .NET developer with over five years of hands-on experience, I am confident that I am the right fit for your Senior .NET Web Maintenance project. My expertise in C#, SQL Server, and Entity Framework aligns perfectly with the core stack of your web application. Additionally, my familiarity with ASP.NET (including MVC and newer .NET Core services) and Git, as well as my ability to optimize T-SQL for enhanced query performance will be significant assets to revamping your existing codebase. What truly sets me apart, however, is my approach to code maintenance and enhancement - one that focuses on delivering high-quality results without compromising agility or increasing technical debt. Having worked at Google and Apple previously, I've learnt invaluable lessons on structuring development processes efficiently while striving for continuous improvement. This means you can entrust me to not only review and refactor existing modules in your application but also design and implement new features that align seamlessly with established patterns.

@ssldevmaster

Hi, I can easily DO your work IN 24 HOURS, DM me now to get started, PRICE NEGOTIABLE 100% Work satisfaction is provided

@sumitwebrainbows

With over 5 years in ASP.NET and C# programming, and a solid grasp of SQL Server and Entity Framework, I believe I'm the right person to handle your web maintenance project. My hands-on experience with these technologies, Git for version control, and CI/CD pipelines will ensure a seamless transition into your existing codebase. Additionally, my understanding of refactoring legacy code and optimizing T-SQL queries will serve your project well. I emphasize clean coding practices which includes thorough unit testing and minimal comments to enable code that explains itself. This approach aligns with your expectation of code that requires minimal review- making peer-approved pull requests the norm. Lastly, as a seasoned developer, I am well acquainted with the dynamics of handovers. My goal for any handover is to ensure a small knowledge-transfer session albeit one that leaves the next person (regardless of their level of familiarity) confident in the changes made. With this in mind, I'm eager to discuss timelines and milestones with you in order to begin this project as soon as possible. Let's work together to keep your application moving forward in an efficient manner!

@radadiyakaushik3

Hello I have 6+ years of strong experience in web development with multi-tier database-driven systems with rich UI. My technical expertise : => Asp.Net MVC, C#.Net, Asp.Net Core2.0,2.2,3.0,3.1, Web API 2.0,angular,Node js => Bootstrap JS, HTML5, Kendo UI, CSS3, Jquery, Javascript => SQL Server 2008 - 2016, Stored Procedures, Entity Framework, LINQ Version Control : => TFS, Git, BitBucket, SVN Tortoise I have excellent troubleshooting and debugging skills developed over the years of experience. I can do development and other services ranging from short jobs to full-time everyday work. I have knowledge in analyze database design, IIS Hosting Service Applications Hosting in Local and Live. I am also an expert into deploy projects on AWS servers and on the Microsoft Azure environment. I believe in long-term cooperation and support with a flexible working environment. Thanks

@antopstechnology

Hi, We would be a great fit for maintaining and enhancing your existing ASP.NET application. With 12+ years of experience in .NET development, our team has extensive expertise in C#, ASP.NET MVC, .NET Core, SQL Server, Entity Framework, Git, and CI/CD workflows. We are comfortable working with live production systems, refactoring legacy code, implementing new features, optimizing T-SQL queries and stored procedures, and ensuring clean, maintainable code backed by unit testing. We follow established coding standards, provide well-documented pull requests, and focus on delivering stable, review-ready solutions. Why choose us? ✔ Professional and experienced team ✔ 1000+ happy clients ✔ Serving clients in 15+ countries ✔ Strong .NET and SQL Server expertise ✔ Clean, scalable, maintainable code ✔ Reliable communication and fast turnaround We would be happy to discuss timelines, milestones, and how we can contribute to your project's long-term success. Best regards, Antops Technologies

@rakeshkumar1684

Hi, I have over 15 years of hands-on experience with C#, ASP.NET MVC, .NET Core, SQL Server, and Entity Framework, working on live production systems with active users. I’m comfortable maintaining and extending existing applications, refactoring legacy modules, optimizing SQL queries and stored procedures, and implementing new features while keeping code aligned with existing architecture. I regularly work with Git, CI/CD pipelines, and unit testing, and I focus on clean, maintainable code that makes future handovers and code reviews smooth and efficient.

@milanrathod945

Working in a live ASP.NET codebase means every change has a blast radius. Reading existing patterns before touching anything is the only safe path, and on PMI, a 70-tenant hospitality SaaS running 230+ hotels per tenant on .NET 8 and SQL Server, that discipline is the whole job: a poorly refactored module breaks reporting for hundreds of clients. The approach: read the patterns, refactor incrementally, cover the changed path with tests. For slow T-SQL, execution plans come first; most issues are a missing index or parameter sniff, not a logic rewrite. New features slot into the established service/repository structure so the next developer finds them rather than hunts for them. PRs get a context note covering the why so code review takes minutes. That covers all five items on your list: module reviews, new features, SQL tuning, unit tests, and clean pull requests. Repo access is all I need; first deliverable within a few days. New to Upwork but not to this stack. Can you share repo access and point to the first module you want reviewed? Happy to start with a small paid milestone so you see the quality before committing further.

@NEHABHAT92

As an IT professional with over nine years of extensive experience in web and mobile development, I am confident that I possess the expertise and skills necessary to excel at this Senior .NET Web Maintenance role. My talents span a broad range of essential areas for this project including five plus years with C# and SQL Server, exposure to ASP.NET, .NET Core services, Entity Framework, Git for version control and CI/CD pipelines. In my career, I have often found myself tasked with maintaining and improving pre-existing web applications, making them more efficient and optimizing their performance. I am well-versed in the creation and modification of stored procedures in SQL as well as database schema management. Additionally, I can produce clean code while implementing new features or refactoring existing modules which are easily understood by others. Lastly, my commitment to delivering a high-quality product is second to none. Right from the start, you can expect me to hit the ground running in understanding your codebase , keeping your projects up-to-date, providing concise unit tests and giving a thorough handover scan through graphs of everything I've done ensuring a seamless continuity for ongoing development even after my involvement. To guarantee your total satisfaction even beyond project completion, I offer free 3 months support for any queries or issues that may arise and also provide economic domain and hosting offers. Choose me as your go-to free

@krishnabhagwat

Hello, I hope you are doing well. I am an experienced Angular & .NET Developer with over 3years of experience in developing web applications, REST APIs, and enterprise solutions. I have worked on projects involving Angular, C#, ASP.NET Core, Web API, SQL Server, Entity Framework, LINQ, TypeScript, JavaScript, Bootstrap, Git, and Azure. My expertise includes: ✔ Responsive UI Development using Angular ✔ REST API Development & Integration ✔ Database Design and SQL Optimization ✔ CRUD Operations & Business Logic Implementation ✔ Bug Fixing and Performance Optimization ✔ Authentication & Authorization ✔ Deployment and Maintenance Support I always focus on writing clean, scalable, and maintainable code while ensuring timely delivery and clear communication throughout the project. I would be happy to discuss your requirements in detail and suggest the best possible solution for your project. Looking forward to hearing from you. Best Regards, Krishna Bhagwat Angular & .NET Developer

@shailender18

Hi, I have 5+ years of experience working with .NET, C#, ASP.NET MVC, .NET Core, Entity Framework, and SQL Server on live production applications. I'm comfortable working with existing codebases, refactoring legacy modules, implementing new features, optimizing SQL queries and stored procedures, and maintaining clean, scalable code. I also have experience with Git workflows, code reviews, CI/CD pipelines, and unit testing. What stood out to me is that you're looking for someone who can understand an existing system and improve it without disrupting day-to-day operations. That's the type of work I enjoy and have done successfully on long-term projects. I'd be happy to discuss your current application, backlog priorities, and how I can contribute to the team. Best regards, Shailender