Carlos Mario Gonzalez Sarmiento

About me

I enjoy building products end-to-end, understanding every layer of the system—from the user experience to the backend logic and the architecture behind it. I learn quickly and adapt easily to different environments and technologies. I’m currently focused on mobile development with React Native (Expo), but I also have experience building web applications using Next.js and SvelteKit. On the backend side, I work with NestJS, Express, and FastAPI, mainly using PostgreSQL and Docker for development and deployment environments. I don’t limit myself to a single stack: I like understanding the entire ecosystem and choosing the right tool for each project.

Work experience

• Neworld

  FullStack Web Developer

  February 2025 - July 2025

Education

• University of Buenos Aires (UBA)

  Computer Engineering - Currently in second year

  March 2024

• Complementary Training in Web and Mobile Development

  Software developer

  August 2022

Youtube

Chat App

In this video, I show you the final result of developing a real-time chat with React Native (Expo) and FastAPI.

Neworld Online Shop

I developed a complete online store, implementing a payment gateway with MercadoPago. I used SvelteKit to build both the frontend and backend, and managed the PostgreSQL database using Prisma as the ORM.

Turn your PDFs into exams with AI

I developed a web application that transforms PDF documents into multiple-choice quizzes using artificial intelligence. Its goal is to help students and professionals practice for exams in a more interactive way.

Projects

• Neworld online store •

  Development of a fully functional technology store, with integration of the MercadoPago payment gateway to securely process transactions.

• Choices AI •

  Transform PDF documents into multiple-choice quizzes using artificial intelligence. Its goal is to help students and professionals practice for exams in a more interactive way.

• CalAI

  Using artificial intelligence, it helps us obtain the calories and nutritional properties of the food we are about to eat just by taking a photo. We can save that information and track our daily calorie intake to observe how we eat over time.

• ChatGPT web

  ChatGPT clone with advanced features, including image and audio generation by integrating with the OpenAI API.

• ChatGPT mobile

  Mobile version of the ChatGPT clone, developed with React Native and Expo, enabling image and audio generation on mobile devices.

• Helpy •

  A web platform to connect users with local professionals via an interactive map, making it easy to find and contact experts to solve service needs quickly and efficiently.

• ChatGPT backend

  RESTful API built with NestJS to manage client requests and integration with the OpenAI API, serving as the application's brain.

• Teslo store mobile

  E-commerce mobile application for a clothing store, developed with React Native and Expo to provide a seamless shopping experience.

• Teslo store web •

  A complete e-commerce web platform for a clothing store, built with Next.js and Tailwind CSS for optimal performance and a modern design.

• Teslo store backend

  Robust REST API developed with NestJS, designed to manage products, orders, and user authentication for the Teslo platform.

• Chat to your pdf

  Web application that allows users to interact with their PDF documents, asking questions and getting answers based on the file's content.

• Spotify clone

  Functional Spotify clone that allows browsing albums and playing songs, built with Astro, React, and Tailwind for a fast and modern interface.

• Kotflix

  Mobile application to browse movies currently in theaters, view details like synopsis and cast. Natively developed for Android with Kotlin.

• Todos

  Task management mobile application with user authentication and cloud data storage, using Firebase and React Native.

Skills

• HTML
• CSS
• Tailwind
• TypeScript
• Nest
• Expo
• Kotlin
• Node
• Postgresql
• Git
• GitHub
• Next.js
• Svelte
• React