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. 2+ 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 2+ 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 - Present

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. Thousands of monthly visits.

Next.jsReactTypeScript.NETPostgreSQL

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Backend

URL Shortener - Node.js

Backend built with Node.js and TypeScript using layered architecture, JWT, Redis, and Prisma. Includes link shortening, visit tracking, and authentication.

Node.jsTypeScriptPrismaPostgreSQLRedisJWT

Code

Backend

Currency Converter - .NET Core

Backend built with .NET Core using layered architecture, Redis caching, and SQL Server. Includes currency conversion, range reports, and CSV export.

.NET CoreSQL ServerRedisDocker

Code

Backend

Blog Backend - .NET Core

Blog backend built with .NET Core using layered architecture, JWT, and SQL Server. Includes role-based authentication, email service, error handling, and image uploads.

.NET CoreSQL ServerJWTAutoMapperFluentValidation

Code

Backend

Live Chat - .NET Core

Real-time chat backend built with .NET Core and SignalR. Supports messages, images, audio, and document uploads using WebSockets and REST endpoints.

.NET CoreSignalRWebSocketsREST APISQL Server

Code

Let's Talk?

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

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