FinTech .NET Module Development

@nandasunny449

Hi, I'm a Senior Full Stack .NET Developer with **8.6 years of experience** building enterprise applications using **C#, ASP.NET Core (MVC & Web API), SQL Server, React.js, REST APIs, and GitHub**. Your FinTech project closely matches my background. I have hands-on experience developing secure payment workflows, integrating **Stripe** payment gateways, implementing transaction logging, error handling, retry mechanisms, and payment recovery. In one project, I redesigned the payment flow to prevent duplicate charges and recover incomplete registrations using Stripe PaymentIntent tracking, ensuring every transaction remained traceable and auditable. I also have strong experience building **User Management** modules with complete CRUD functionality, role-based authorization, authentication, activity logging, and secure API design. I'm comfortable integrating third-party SMS/notification APIs and implementing scheduled reminders for payment events. Most recently, I worked with a UK-based software company (NDA protected), where I built payment processing, membership management, REST APIs, administrative modules, and scalable backend services. Although I can't share the source code, I'm happy to discuss the architecture and technical decisions during an interview. **Availability:** Immediate **Rate:** 1250 INR /hour I look forward to discussing how I can contribute to your project. Best regards, Sunny Nanda

@vinod150987

Hello, I’d be excited to help deliver the next release of your FinTech platform, with a strong focus on building secure, scalable, and production-ready Bill Payments and User Management modules. With solid experience in **C#, ASP.NET Core (MVC & Web API), SQL Server, React.js, REST API integrations, and GitHub-based development workflows**, I can take ownership of the complete implementation while ensuring performance, security, and maintainability. I write clean, well-documented, and maintainable code, follow GitHub best practices, and ensure every feature is thoroughly tested before merging into the main branch. My goal is to deliver a solution that is reliable, scalable, and ready for production with zero critical issues. I would be happy to discuss your existing architecture, payment gateway, SMS provider, and deployment process before getting started. Looking forward to contributing to your project. Best regards

@ASSAMWEB

Greetings, I have read the project description I have been working on a similar project in recent time. I am interested in the work open a chat to discuss requirements in details.

@ashinnd84

Hello there, we are a team of AI/Ml automation, Python, Web and Mobile App developers. Please, send me a message to discuss the work and finish in no time. Thanks Ashish.

@mkh559a5a1fd66e9

Having been in the industry for over 15 years, I bring a wealth of experience and expertise to the table as an .NET developer, especially regarding the end-to-end development of complex applications involving integrations and critical systems. My résumé includes successful projects across healthcare, finance and many more sectors – all sectors heavily reliant on security and performance - giving me a deep understanding of the demands of FinTech software. I possess comprehensive knowledge of the tech stack outlined in your project description and have an excellent grasp on developing integrated solutions with major 3rd party APIs. Over the years, I have built not just on robust databases but also secured them against crucial vulnerabilities. This hands-on experience extends to your project requirements as well; from setting up wire communications with payment gateways and managing transactions to configured logs for audits, I have dealt with it all!

@kend27

Hi, I’m available to start immediately and can support this engagement remotely. My background is strongest in backend systems, payment workflows, API integrations, SQL-based data platforms, auditability, retries, idempotency, and production reliability. I’ve worked on financial transaction systems where correctness, traceability, and failure handling were critical, including payment reconciliation and ledger-style workflows. I should be transparent that my recent production work has been more Python/backend-focused than C#/.NET, so I wouldn’t want to overstate direct ASP.NET Core experience. However, the core engineering requirements—secure payment integration, role-based access, audit logging, notifications, automated testing, deployment, and performance tuning—are closely aligned with systems I’ve built. My availability is immediate. My rate is 15 per hour. I can also share relevant backend and FinTech project examples privately, including payment-processing, reconciliation, API integration, and auditability work.

@mayankinnovative

My name is Mayank, and I'm a highly skilled developer specializing in end-to-end FinTech solutions. With over 20 years' experience in PHP-based development, API integrations, payment gateways, and complex backend logic, I believe I can effectively shape and improve your Bill Payments and User Management modules. I have a proven track record for creating robust systems that perform smoothly and scale cleanly. My experience with C#, ASP.NET Core (MVC & Web API), SQL Server, React.js on the front end, and GitHub for version control aligns perfectly with your tech stack requirements. Moreover, my career-long focus on security best practices ensures that your users' data and transactions remain absolutely secure. In terms of deliverables, I'm thorough and methodical. You can expect from me production-ready features merged into the main branch, automated tests and deployment scripts, documentation covering setup/APIs/notification logic along with a concise code review summary highlighting optimizations and security hardening applied. Having worked on numerous projects where performance was critical, I stand by my promise to maintain an average response time of 200ms or less on key endpoints while ensuring zero critical issues in final code reviews. I value long-term relationships with my clients and am confident in delivering reliable results from the start.

@mubeenm5026

As an accomplished software developer and owner of Web Crest, I bring a wealth of experience to .NET projects like yours. Bill Payments and User Management are not new to me; I've created similar features in the past, ensuring robustness, performance, and most importantly, security. I'll leverage my skills in C#, ASP.NET Core (MVC & Web API), SQL Server, and React.js to seamlessly integrate your existing payment gateway into the workflow while logging every transaction for auditable purposes. Automated SMS reminders & payment notifications will be in safe hands with me. With my expertise in performance tuning and API integration, I guarantee the SMSs will be triggered accurately based on configurable schedules and payments will process through the gateway smoothly with proper retries and error handling. Regarding scalability and maintainability, they are key values at Web Crest. Starting from designing robust CRUD screens with role-based access for User Management to compelling back-end logic using Node.js/Express.js/NestJS/Laravel/PHP/Django/FastAPI/ASP.NET Core, our goal is to deliver products that can scale cleanly over time. Also, rest assured that your code will always be version-controlled by the powerful GitHub.

@sumitwebrainbows

As a seasoned full-stack developer with a proficiency in .NET technologies and a focus on FinTech projects, I have all the skills you're seeking for this endeavor. My extensive experience in C# and ASP.NET Core (MVC & Web API) will be instrumental in shaping your Bill Payments and User Management modules from end-to-end, ensuring top-notch performance, smooth scalability, and robust security. In my previous work, I've built numerous web applications with similar functionalities, making me well-versed in creating workflows, integrating payment gateways like the one you have, maintaining accurate transaction logs, role-based access management, detailed tracking systems, and automated SMS notifications. My expertise extends beyond these technical abilities; I'm experienced in version control using GitHub, I understand the importance of comprehensive documentation for easy maintenance and future development. Additionally, my commitment to high-quality includes delivering end-to-end automated tests and deployment scripts. Rest assured that with me on board, your project will meet all acceptance criteria, will be secure, performant and - most importantly - meet your user's needs promptly. Let's get started today!

@AnwarJaved

Hello, I'm available to start immediately and would be happy to help deliver these modules. I have 15+ years of experience in C#, ASP.NET Core, ASP.NET MVC, Web API, SQL Server, and React.js, building secure, scalable business applications. I've worked extensively on payment integrations, role-based access control (RBAC), audit logging, notification systems, and high-performance APIs for enterprise and SaaS platforms. For your project, I can: * Build the complete Bill Payments workflow with secure payment gateway integration, transaction logging, retry mechanisms, and comprehensive error handling. * Develop a robust User Management module with CRUD operations, role-based authorization, activity auditing, and secure authentication. * Implement automated SMS reminders and payment notifications with configurable schedules and background processing. * Optimize API performance to meet your response time goals while following .NET security best practices. * Deliver production-ready code with automated tests, deployment scripts, and clear technical documentation. **Availability:** Immediate (40+ hours/week) **Rate:** ₹1,000/hour Recent experience includes developing secure SaaS and enterprise applications using ASP.NET Core, React, SQL Server, REST APIs, and cloud deployments. I can also share my portfolio and GitHub/LinkedIn profile upon request. Looking forward to discussing your requirements. Thanks, Anwar Javed

@dushyant317

I can enhance your FinTech web application by delivering secure, scalable Bill Payments and User Management modules using ASP.NET Core (MVC/Web API), C#, SQL Server, and React.js. I'll implement robust payment workflows with retry logic, RBAC, audit trails, automated SMS notifications, comprehensive testing, performance optimization, and well-documented, production-ready code that integrates seamlessly with your existing architecture and GitHub workflow.

@sanarena

Hi, I’m Armin Nikdel. I can take your Bill Payments and User Management modules from design to delivery, making sure they integrate cleanly with your existing payment gateway and role-based access model. I’ll build the full payment workflow with transaction logging and audit trails, then set up the user management screens with granular permissions and activity tracking—all within your C# / ASP.NET Core stack and React frontend. For verification, I’ll run end-to-end tests on payment flows against sandbox gateway responses and confirm that role restrictions actually block unauthorized actions on the UI and API. The SMS reminders will be triggered by a background service that checks due dates and payment statuses, with retry logic for failed deliveries. One thing I’d like to clarify: do you already have an SMS provider selected, or should I recommend one that works well with your current infrastructure? I can deliver this in around 10 days for INR 1250.

@DeepakDuseja

Hi, I am a Senior .NET Developer with 4+ years of hands-on experience in building robust and scalable Desktop & Web applications. I specialize in C#, ASP.NET, .NET Core, RESTful APIs, Entity Framework, and MS SQL Server. Throughout my career, I have successfully delivered end-to-end solutions across diverse domains, including ERP, Inventory Management, School Management, and Healthcare, as well as fully customized applications tailored to specific client requirements. I am passionate about writing clean, efficient code and committed to delivering high-quality software solutions that meet both technical and business objectives. Thanks & Regards, Deepak Senior .NET Developer

@arashyazdanibakh

Hello, I’m a Senior .NET Developer with more than 12 years of experience building secure, scalable, and high-performance enterprise applications. What makes me a strong fit for this project is that I have **designed and implemented a complete Payment Gateway**, so I understand payment workflows, transaction integrity, retries, audit trails, reconciliation, and the security requirements that FinTech systems demand. I can deliver the Bill Payments module with reliable gateway integration, comprehensive transaction logging, retry/error handling, and performance optimization. For User Management, I’ll implement clean CRUD operations, role-based authorization, and detailed activity auditing following security best practices. My expertise includes **ASP.NET Core (MVC & Web API), C#, SQL Server, Angular, REST APIs, Clean Architecture, CQRS, and performance optimization**. I also have extensive experience with automated testing, deployment pipelines, and writing clear technical documentation. I write clean, maintainable, production-ready code and focus on scalability, security, and long-term maintainability—not just completing tasks. ✅ Available to start immediately. **Rate:** ₹1,250/hour I’d be happy to discuss your architecture and how I can help make this release reliable, secure, and production-ready.

@devangsinh

I'd be happy to help with this project. I have 8+ years of experience building secure and scalable applications using C#, ASP.NET Core (MVC & Web API), SQL Server, React.js, and GitHub. My recent work has been in the FinTech/e-Invoicing domain, where I've developed payment-related workflows, integrated third-party APIs, implemented role-based access control, optimized high-volume systems, and ensured compliance with strict security and audit requirements. Your requirements align well with my experience: - Complete Bill Payment workflow with payment gateway integration, retries, logging, and audit trails. - User Management with secure CRUD operations, role-based permissions, and activity tracking. - Automated SMS reminders and payment notifications based on configurable schedules. - Performance optimization, security hardening, automated testing, deployment support, and complete technical documentation. I write clean, maintainable, production-ready code and focus on scalability, performance, and long-term maintainability. Availability: Can start immediately. I'd be happy to discuss the architecture, timeline, and approach before we get started. Looking forward to working with you!

@kishanbwts

I’ve helped a FinTech client recently build a payments workflow integrated with a third-party gateway, including full transaction logging and retry logic for failures. I know how crucial it is to keep these flows smooth and secure, especially when scaling user management with role-based access and detailed activity logs. For your Bill Payments module, I’d wire the complete workflow with solid error handling and transparent audit trails. On User Management, I’ll create clean CRUD screens with strict role control and track all user actions. The SMS reminders can be implemented with configurable triggers that cover all payment states you mentioned, firing on due dates, failures, or successes. Quick question: Do you have a current policy for retry intervals and escalation on payment failures? Also, are there existing APIs or specs for your SMS gateway? I’ll deliver production-ready features fully tested and documented, with deployment scripts and a focused code review on security and performance. I’m ready to start as soon as you onboard me remotely. My rate is included in this proposal. Just send the access details, and we can get going.

@Geetam00

As a top 3% ranked freelancer on Freelancer.com, I'm privileged to work on diversified projects and have delivered solutions that have spanned over 250 happy clients in 42+ countries. Over the past 5 years, my team and I have developed a vast array of web-based and mobile applications with adeptness in .NET, .NET Core, C#, and React.js, just to name a few. Your FinTech project piques my interest tremendously as the modules your app is moving into, such as Bill Payments and User Management, are areas our expertise can truly shine in. From building out complete, auditable workflows for payments to creating robust CRUD screens and implementing role-based access for user management — we've done it all! Plus, automation isn't a stranger to us. We are well-versed in developing complex automated SMS reminder systems like the one you need. Security has always been a key priority for us in every project we've undertaken. When it comes to the fintech industry, however, can assure you that we've implemented safety mechanisms that adhere above par to ensure flawless functioning all day every day. With an added specialty in performance tuning and integrating APIs smoothly, we take your demand for this project even more seriously. Let's shape your modules end-to-end the way you envision them—and more!

@riverjamesj

Hello, I’m a Senior Full-Stack Engineer with 7+ years of experience building secure financial, SaaS, and enterprise applications using C#, ASP.NET Core, SQL Server, React.js, and REST APIs. Your Bill Payments and User Management modules align closely with my background. I have experience developing payment workflows, role-based access systems, audit logging, notification services, and high-performance APIs for business-critical applications. I can help with: • End-to-end Bill Payment workflow implementation • Payment gateway integration with retries and error handling • User Management with RBAC and activity auditing • SMS reminders and payment notifications • Performance optimization and security hardening • Automated testing and deployment support • API and technical documentation My focus is on clean architecture, scalability, security, and maintainability. I’m comfortable working within existing codebases and collaborating through GitHub-based workflows. I’m available to start immediately and would be happy to discuss the current architecture, release timeline, and technical requirements. Best regards

@valeriaperezw6

Hello there , Good morning! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in C# Programming, ASP.NET MVC, .NET Core, Microsoft SQL Server, React.js, .NET, ASP.NET and API. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. If you have any questions, please let us know