Alonso B.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Full-Stack Software Developer, Microsoft Certified Specialist, full time freelancer, costarican, english-fluent. The main niche in the last years is related to the Parking, Access Control, Logistics and E-Commerce sectors. Have spent the last years developing these kind of solutions, from scratch to one of the most important parking solutions company on the central-american region. It doesn't mean I can get hired to do an application from a different business niche, but this is definitely my area of expertise! Delivers Web apps, using Microsoft .NET (C#, VB, Core, MVC, Web API, etc), JS Frameworks (JQuery, Angular, ReactNative, TypeScript) or PHP (Laravel, Yii, from scratch). Is a Microsoft Certified Professional and uses the latest technologies. Builds Desktop Apps using .NET Winforms as well. Builds mobile apps using Ionic Framework or React Native, has published several apps on Play Store and App Store, is familiar with all the publishing process on stores. Kind of stuff that I do often: Development from scratch of Parking Solutions, development of external integrations for Came-Parkare software, Access-Control, Credit Card processing solutions for automatic cashier and standalone machines (including EMV and PCI compliance, ECR protocol) from scratch or integrated to third party interfaces. I have experience as well into connecting Electronic Invoicing (Facturación Electrónica) Systems in Latin America. Can do these kind of integrations as well. Other business niches of experience: Medical, Consulting, Funeral Home, Education, Tourism Agencies, Freight Forwarding.