Experienced C#/.NET Developer – Small API Integration Updates

@Microlent

This is exactly the kind of maintenance work I regularly handle. Since the application and integrations are already in place, my focus would be on understanding the API changes, updating the existing implementation with minimal impact, and thoroughly testing the integration before handover. I have 17+ years of experience with C#, .NET, Visual Studio, REST APIs, JSON, and third-party integrations. I've worked on updating legacy integrations, authentication changes, request/response mapping, webhook implementations, and API version migrations while preserving existing application behavior. My experience includes: • C#/.NET desktop and enterprise applications • REST API integration and JSON serialization/deserialization • Debugging and troubleshooting existing codebases • Third-party API migrations and authentication updates • Visual Studio, Git, and production support I'm comfortable working via remote access, keeping the source code within your environment, and communicating through Teams or Zoom as needed. I'm available to start immediately and can complete the work within your estimated 2 to 4 hours, assuming the API changes are limited to the described scope. One question: are the API updates primarily related to endpoint changes, authentication (OAuth/API keys), or request/response schema modifications? Best regards, Rajesh Rolen

@vano101

Hello I am Windows Desktop application developer and I have over 15 years of experience with C#, NET and Visual Studio! I have extensive experience with 3rd party WEB APIs like REST APIs, and I have completed a lot of similar projects. And I am familiar with various libraries to parse/generate JSON. I am comfortable reading and modifying existing code, and moreover most of projects involves rather modifying code than creating project from scratch. I am available to start working immediately.

@seefattechnologi

Excellent experience with similar projects---->>> I will surely achive your given goals with high QUALITY---Small API Integration Updates I am an CREATIVE/Multitalented .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!!!

@vladang

Third-party API changes usually aren't just endpoint updates—the response shape, authentication flow, or validation rules often change too, so I'd start by comparing the current requests and payloads against the updated API docs before touching the integration code. This sounds like a focused maintenance task rather than a rewrite. I'd work within your existing C#/.NET codebase, update only what's required, and verify that serialization/deserialization still matches the new JSON responses. One thing I always check is whether existing models silently fail when new fields or renamed properties are introduced, since that's a common source of integration bugs. I've worked with C#/.NET applications that integrate with REST APIs, debugging and updating existing code in Visual Studio rather than replacing working implementations unnecessarily. Remote access and keeping the source on your systems is completely fine. I'm available to begin as soon as access is provided.

@anirudhat

Third-party API changes breaking an existing integration usually come down to a handful of things — a changed endpoint or version path, a new auth scheme (OAuth token flow or header change), or tweaked request/response JSON that your models no longer deserialize cleanly — so my first step on your dev environment is to reproduce the failure and read the actual HTTP traffic to pin down exactly what the provider changed. From there the fix is targeted: update the endpoints, adjust the DTO/model classes and serialization, refresh the auth handling, and add sensible error handling so a future API hiccup fails loudly instead of silently. I've worked extensively in C#/.NET with REST and JSON integrations in Visual Studio, reading and modifying existing codebases rather than rewriting them. I'm comfortable with your milestone structure and Teams/Zoom if you want to screen-share while testing. Available to commence immediately.

@kamran2012

Hi, I will update your existing REST API integrations in the Windows desktop application to align with the third-party API changes, tested and confirmed working within your remote development environment. On a similar project, isolating each API change behind a feature flag let me verify the updated endpoints without disrupting the rest of the app during testing. Questions: 1) How many third-party APIs need updates, and do you already have the new endpoint documentation? 2) Is the application targeting .NET Framework or .NET 6+? Share the scope details and I will confirm timing to start this week. Best regards, Kamran

@Hubready

Hello!, I am a US-based senior software engineer(frontend, backend, ecommerce, etc) with 15+ years of experience in C#/.NET, API development, Visual Studio, and debugging. I read your project carefully and understand you need a few small but important updates to an existing API integration, so accuracy and low-risk changes matter here. I’ve spent years working inside existing .NET systems, so I’m comfortable making targeted updates without causing side effects. My approach would be: 1. Review the current API flow and pinpoint the exact update points 2. Reproduce the issue in a safe dev/test environment 3. Implement the changes cleanly and efficiently 4. Test the endpoints to confirm everything still works as expected Could you please clarify the following questions to help me better understand the project? 1. Which API endpoints or integration points need updating? 2. Is this strictly backend work, or is any related UI/admin logic involved? 3. Do you have sample payloads or expected request/response examples for reference? Relevant work I’ve handled includes API-driven inventory sync tools, internal .NET admin dashboards, payment integration updates, and third-party service connectors for small SaaS products. I pay close attention to the details because with API work, that’s usually what separates a quick fix from a solid result. If you want someone who will treat this carefully and keep communication clear, I’d be glad to help. James Zappi

@brayanstiven5

Hello, I can complete these API integration updates quickly and safely. I have extensive experience with C#/.NET desktop applications, Visual Studio, REST APIs, JSON serialization, authentication, and maintaining legacy integrations when third-party APIs change. My approach is to first review the existing integration points, compare them against the updated API documentation, identify any breaking changes (authentication, endpoints, payloads, or response formats), implement only the required modifications, and thoroughly test to ensure existing functionality remains unaffected. I also use structured logging and debugging to verify every API call before delivery. I've worked on integrations involving payment gateways, CRM systems, cloud services, and other REST-based APIs, updating existing codebases while minimizing risk and avoiding unnecessary refactoring. I'm available to start immediately and can work within your remote development environment. Given the scope, I expect the work to be completed within the estimated 2–4 hours, with clear communication throughout the process and support during testing until everything is confirmed working. I look forward to discussing the affected APIs and getting started.

@teodorgeorge

Hello, I have strong experience with C# and .NET desktop applications, including REST API and JSON integration updates. I am comfortable reading existing code, debugging API changes, and working in Visual Studio without disrupting working features. I can review the current integrations through your remote development environment, apply the required third-party API changes, and prepare the updates for your testing. I am available to start promptly and can communicate through Teams or Zoom if needed. Best regards, Teo

@ozbas

With over a decade of experience in software development, I have cultivated a deep proficiency in C#/.NET, making me an ideal fit for your task. I have a robust command over REST APIs and JSON and I'm adept at reading, debugging, and troubleshooting existing code. Moreover, my prior work with third-party APIs will make the required small updates smooth and seamless. As crucial as the technical skills are, equally important is staying connected throughout the project's lifecycle. I assure you of my commitment to regular communication via Teams or Zoom, ensuring that your vision is seamlessly executed. In addition, my familiarity with Visual Studio will expedite the process to complete within the allocated time frame of 2-4 hours. Not only am I dedicated to completing this project proficiently, but I am also committed to providing holistic support even after project completion should any issues arise. Additionally, I offer a competitive rate of AUD $250 for your budgetary needs while maintaining the highest level of service. Let's take your Windows desktop application one step further and ensure the finest API integration updates. Looking forward to discussing how we can best work together!

@efanntyo

Hi there, I'm thrilled to apply for your project requiring updates to existing API integrations within your Windows desktop application. With extensive experience in C# and .NET, I have successfully worked on numerous projects involving REST APIs and JSON, ensuring seamless integration and functionality. My proficiency in reading and modifying existing code allows me to swiftly adapt to new requirements, and my strong debugging skills ensure efficient troubleshooting. Understanding the need for precise and effective updates due to changes in third-party APIs, I am fully equipped to make the necessary modifications while maintaining the integrity of your application. My experience with Visual Studio and API development will be instrumental in executing the required updates efficiently. For this project, I intend to carefully assess the existing integrations, identify the necessary changes, implement the updates, and thoroughly test the modified code to ensure robust functionality. I am comfortable with remote collaboration and open to communication via Teams or Zoom to discuss any specific project details. I am available to commence work promptly and look forward to the opportunity to contribute to your project's success. Thank you for considering my proposal. Best Regards,

@ykarora26

As a seasoned .NET developer with a penchant for problem-solving, I strategize and execute intelligently to ensure seamless API integrations in Windows desktop applications. My proficiency in both C# and .NET allows me to read and modify existing code effortlessly, making any necessary updates to accommodate third-party API changes. I have extensive experience working with REST APIs and JSON, ensuring the smooth flow of data between systems - a critical skill for this project. In addition to my technical abilities, I bring to the table a host of valuable attributes including good debugging and troubleshooting skills, proficiency in using Visual Studio, and an exemplary history of past API integration work. Through 14+ years and 500+ completed projects, I've been fortunate to eliminate scalability issues, increase performance, and deliver clean custom features just like your project requires. A controlled yet effective member like myself might be worth considering. I pledge to initiate your task almost immediately whilst providing transparency through every step. My 'get-things-done' attitude will promise quality outcomes within your required timeframe. Beyond completion, you can rely on my support as the code change is tested and confirmed so that final payment is made on completion with complete peace of mind for you. Let's hop onto Teams/Zoom to satisfy any questions/confusion or share more about my prior projects similar to yours.

@Muhammadzeesha59

Hello Sir/MAM I am a skilled full stack developer. Having rich experience in Java , C++ , C , C# , Visual Studio, API Integration , Python , Eclipse , Sql , Mysql , .Net ,Oracle , Object Oriented Programming , Data Structure , Algorithms, Linux , Windows , Cloud , Azure . I have a perfect grip on “Artificial Intelligence” “Automation” , and work in “Machine Learning” Deep Learning “Computer Vision ”. My track record as demonstrated in my 100% job completion and 5-star review rating showcases My ability to deliver exceptional results on time and with utmost quality I believe that my skill set makes me the ideal candidate for this project Please come on chat we will discuss more about this I will be waiting for your reply . Thanks and Best Regards

@ahmadayaz

I have a strong background in C#/.NET development, specializing in API integrations. With expertise in REST APIs and JSON, I can swiftly update your existing integrations using Visual Studio for precision. I ensure efficient modifications while maintaining code integrity. My fixed budget is AUD $250 with a delivery timeline of 2-4 hours. Let's kick off this project for seamless API communication.

@jeanpatrickr8

Hello, I appreciate the opportunity to bid on your project to update API integrations within your Windows desktop application. I understand that you need a skilled C#/.NET developer to make minor code adjustments due to changes in third-party APIs. With over five years of experience in C# and .NET development, I have a solid background in working with REST APIs and JSON, which will enable me to efficiently implement the required updates. I am proficient in reading and modifying existing code and have a strong ability to debug and troubleshoot issues effectively. Here’s how I plan to approach your project: - Review the current API integrations and identify necessary updates. - Implement changes while ensuring compatibility with the existing code. - Conduct thorough testing to confirm functionality and reliability. - Communicate regularly to keep you updated on progress and gather feedback. I am eager to start this project and am confident in my ability to deliver quality results within the given timeframe. I am available to begin immediately and can communicate via Teams or Zoom as needed. Thank you for considering my proposal, and I look forward to discussing this further.

@emilesd617

Hi, I am a full-stack AI developer with 8 years of rich experience in software development. I am familiar with C#, .NET, REST APIs, JSON, Visual Studio, API development, debugging, and Windows desktop application development. I understand you need to update existing API integrations to accommodate changes in third-party APIs while preserving the current application structure. I can quickly review the existing codebase, implement the required API updates, troubleshoot any integration issues, and ensure the application remains stable and fully compatible. 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.

@antonk52

Hello, As an experienced C#/.NET developer, I possess the expertise and skills you require for this small yet significant project. With my familiarity in working on REST APIs and JSON, I can effortlessly understand, analyze, and modify existing code to accommodate the changes in third-party APIs. Moreover, my debugging and troubleshooting skills coupled with my overall proficiency in Visual Studio are apt for ensuring a seamless process. My backend development skills have honed my ability to deal with API integrations efficiently. Over the years, I have built robust systems on proven enterprise technologies that guarantee reliability, scalability, and high performance -- qualities crucial for your project's success. Not only can you trust me to complete the task meticulously, but also expect a stable and 100% functional end result. I am excited and ready to take up this project immediately. My availability coincides with your timeline. Additionally, my fluency with Teams and Zoom ensures a smooth line of communication throughout the process. Let us make this collaboration a milestone where your expectations are exceeded and cost-effectiveness is assured. Look forward to working together! Thanks!

@seventysixeast

I am a hands-on Principal Software Engineer with extensive experience building and deploying production software systems. I specialize in backend and full-stack development using C#/.NET, Node.js, and Python, with strong expertise in SaaS platforms, cloud applications, databases, and AI-enabled solutions. Throughout my career, I have remained passionate about software engineering and enjoy solving complex technical problems through architecture, coding, deployment, and optimization. My experience includes AWS, GCP, CI/CD, PostgreSQL, SQL Server, MySQL, Elasticsearch, payment integrations, and OpenTelemetry.

@quan9824

Hello, I am an experienced software developer with strong C#/.NET development skills and hands-on experience maintaining desktop applications, integrating REST APIs, and troubleshooting existing production code. I have worked on projects involving API communication, JSON data processing, authentication flows, third-party service integrations, and backend/frontend connectivity. I am comfortable working inside existing Visual Studio solutions, understanding current architecture, identifying the impact of API changes, and applying focused updates without unnecessary modifications. For this project, I can help with: • Reviewing the existing integration code and updated API requirements • Updating REST API requests, responses, authentication, and JSON handling • Debugging issues caused by third-party API changes • Testing the updated integration within the existing Windows desktop application • Ensuring the final changes are stable and compatible with the current system I am available to start immediately and can complete this type of focused API update efficiently once I review the current code and API change details. I look forward to helping you update the integrations smoothly.