Available for projects

Sergio Mercado Galarza

Backend Developer · .NET Core & Node.js

Systems Engineer with B2+ English, specialized in backend development. I apply clean code, SOLID, and OOP principles. 3 years building robust and efficient APIs.

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About Me

Hi, I'm Sergio Mercado, a Systems Engineer and backend developer with B2+ English, which has allowed me to work with teams worldwide. I have 3 years working with different technologies, mainly focused on backend with .NET Core and Node.js. Currently working as a Software Engineer for rithmXO.

Experience

Backend Developer

RithmXO

October 2024 - May 2026

Backend developer with .NET, focused on performance, refactoring, and optimizing SQL queries and APIs. Delivered new features, built maintenance tools, and collaborated in code reviews with distributed teams across LATAM and the U.S.

C#.NET CoreAngularSignalRNode.jsSQL ServerPostgresDockerGit

Freelance Software Engineer

Freelance

2023 - 2026

Develop web applications and APIs focused on performance, SEO, and scalability using modern technologies. Currently building my own SaaS (creatucv.dev) with real users and thousands of monthly visits, alongside freelance and open-source projects.

ReactNode.jsNext.jsTypeScriptTailwindMongoDBMySQL

Education

Systems Engineering

Universidad Domingo Savio

2016 - 2021

English B2

Centro Boliviano Americano (CBA)

2017 - 2019

Technologies

frontend

React TypeScript Next.js Angular Astro Tailwind CSS

backend

.NET Core (C#) Node.js (Express) PHP

database

SQL Server PostgreSQL MySQL MongoDB

devops

Docker Docker Compose Git GitHub Actions Azure VPS

other

Redis RabbitMQ Test Unitarios

Projects

Featured ProjectView Live

SaaS · Full Stack

creatucv.dev - CV Platform

SaaS for creating professional resumes with multiple templates, PDF export, and full customization. Optimization with AI.

Next.jsReactTypeScript.NETPostgreSQL

Visit Site

Full Stack

Chatz - Real-Time Chat

Real-time group chat built with React, Node.js, and Socket.IO. Includes instant messaging and a modern UI for collaborative environments.

ReactTailwindNode.jsSocket.IO

Live Site

Full Stack

ConvertPixel: Images converter

Images converter between different formats png/jpg/avif/webp/etc, allows improving or reducing image quality, changing size and rotating images.

Next.jsTailwind.NET

Live Site

Full Stack

Full Stack Notes App

Full stack technical challenge to create, edit, archive, and delete notes with JWT-based user authentication.

ReactNode.jsExpressMongoDBMongooseJWT

Live Site

Full Stack

MERN Blog - Full Stack

Full stack blog built with React and Node.js (MERN). Includes JWT authentication, article publishing, image uploads, and admin panel.

ReactNode.jsExpressMongoDBMongooseJWT

Live Site Code

Full Stack

DameFans - Social Platform

Social platform built with PHP and Bootstrap with 124k+ users and 1M+ monthly visits. Exchange and monetization system with 36M+ clicks and $5.3k generated.

PHPMySQLBootstrapMonetizationHigh Traffic

Live Site

Let's Talk?

If you have a project or a proposal, I'm always ready to talk.

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