Sandeep G.

I build payment, remittance, and digital top-up systems - from API integrations to full B2C/B2B platforms using .NET and modern web technologies. Over 15+ years, I have worked on custom software for money transfer, airtime top-up, and gift card platforms, along with the APIs and admin systems that power them. Most of that experience comes from long-term direct client and business work; I now take on select projects here on Upwork, focused specifically on payments and fintech. What I specialize in: * Remittance & B2C/B2B money transfer software * International airtime top-up platforms (with admin panels) * Digital gift card software & platforms * Payment gateway & third-party API integrations * Custom web applications, mobile apps, and admin dashboards Tools & stack: .NET Framework, C#, ASP.NET MVC, HTML5, MSSQL, REST APIs, AWS, IIS, database design, server administration & security. I'm a Microsoft-certified developer, and I work from idea to fully functional product, planning architecture, building the backend and integrations, and supporting you through launch and beyond. Clients have described working with me as reliable, clearly communicated, and detail-oriented, happy to share references or past project examples on request. If you're building a payments, remittance, or top-up platform and want to talk through the approach, feel free to reach out.