Software Developer

I specialize in solving complex engineering challenges, delivering scalable solutions that optimize performance, UX, and system architecture.

personal
Alexander Castro
Full-stack developer focused on scalable web and mobile solutions using TypeScript and modern JavaScript stacks. Proficient in NestJS, React, Next.js, and React Native. Experienced with AWS, GCP, Firebase, and SQL/NoSQL databases. Skilled in Tailwind CSS, Shadcn, TanStack Query, and integrating AI-powered features and LLMs.

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Experiencia

Locationmemoji
Bello, Antioquia

Technologies

I have experience in a wide range of technologies

  • HTML5
  • CSS3
  • JavaScript
  • TypeScript
  • React
  • Next.js
  • Vite
  • Tailwind CSS
  • Node.js
  • MongoDB
  • MySQL
  • Git
  • GitHub
  • Docker
  • MongoDb
  • Strapi
  • AWS
  • PostgreSQL
  • NestJS
  • Keycloak

Experience

Professional Milestones

Logali Group

Full Stack Developer
Oct 2024 - Dec 2025

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Eco2

Full Stack Developer
APR 2023 - OCT 2024

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Intech

Programing professor
Oct 2023 - Dec 2023

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TICS

Technology Integrator
Jun 2023 - dic 2024

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NGN

Content Creator, social media manager and mentor
Jun 2022 - dic 2022

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Projects

Some of my projects

project screenshot
PróximamenteEn desarrollo activo

Atlex 1.0 — Club Management Platform

Pronto
  • Next.js
  • TypeScript
  • Tailwind CSS
  • MercadoPago
Atlex is a club management platform designed to streamline administrative tasks and enhance member engagement. This project was developed using NestJs, Postgrest, Next.js, React, Tailwind CSS, and integrated with MercadoPago for seamless payment processing.
Coming Soon
~/api-server
server running
$MercadoPago Webhooks
$JWT Auth & RBAC
$Prisma ORM
$Docker Compose
$REST API
$Subscription Management
NestJSPrismaPostgreSQLDockerTypeScriptMercadoPago

Atlex API — Backend Services

Pronto
  • NestJS
  • Prisma
  • PostgreSQL
  • Docker
  • TypeScript
  • MercadoPago
RESTful API powering the Atlex club management platform. Built with NestJS, Prisma ORM, PostgreSQL and Docker. Features MercadoPago webhook integration for real-time payment processing, JWT authentication, role-based access control, and automated subscription management. Currently in active development.
Coming Soon
~/api-server
server running
$SSE Streaming
$Multi-Provider (Groq, Cerebras, Ollama)
$Provider Rotation
$OpenAI Message Format
$/chat Endpoint
$Vercel Deployment
BunTypeScriptOpenAI

Bun Streaming LLM API

  • Bun
  • TypeScript
  • OpenAI
Minimal Bun API that exposes a /chat endpoint with Server-Sent Events (SSE) streaming. Supports multiple LLM backends (Groq, Cerebras, and local Ollama) with provider rotation per request, making it easy to swap or compare models while keeping a single OpenAI-style message format. Deployed on Vercel.
project screenshot

Storyteller ai for kids

  • Next.js
  • Tailwind CSS
  • AWS
  • OpenAI
Storyteller is an artificial intelligence tool designed to generate stories for children. This project was created using Next.js, React, serverless, aws and Tailwind CSS.
project screenshot

MarIA - MVP | IAS Ecosystem.

  • Next.js
  • Tailwind CSS
  • Strapi
IAS management ecosystem. Created from scratch and together with the Eco2 team, using Next.js, React, strapi and Tailwind CSS.
project screenshot

Uber Clone — Ride-Hailing App

  • React
  • Expo
  • TypeScript
A modern Uber clone built to learn and demonstrate real-world ride-hailing features like real-time location tracking, trip management, and scalable app architecture. Built with Expo, React Native and Bun.
project screenshot

Workforce — Logali Group

  • React
  • Expo
  • Redux Toolkit
  • TypeScript
Enterprise mobile app for field workforce management with offline-first architecture. Features expense tracking, attendance, work order management, report generation with image uploads, and Keycloak authentication. Built with Expo, React Native, Redux Toolkit, and SQLite for robust offline data sync. Available on Google Play Store.
~/api-server
server running
$Multi-Tenant Architecture
$Keycloak SSO
$Role-Based Auth
$Expense Workflows
$File Uploads
$Offline Sync Support
NestJSPostgreSQLKeycloakDockerTypeScript

Workforce API — Logali Group

  • NestJS
  • PostgreSQL
  • Keycloak
  • Docker
  • TypeScript
Multi-tenant RESTful API built for the Workforce enterprise platform. Developed with NestJS, PostgreSQL, and Keycloak for SSO authentication. Features multi-tenant data isolation, role-based authorization (technician, contractor, coordinator, accountant), work order lifecycle management, expense approval workflows, and file upload handling. Designed for offline-first mobile sync.
project screenshot

Workforce Admin — Logali Group

  • Next.js
  • Tailwind CSS
  • TypeScript
Web admin panel for the Workforce platform at Logali Group. Enables administrators to create and assign work orders, manage technicians, approve expenses and travel allowances, generate Excel reports from field data, assign job sites, and manage clients. Includes role-based access for coordinators and accountants. Built with Next.js, React and TypeScript.
project screenshot

Like Trello app

  • Next.js
  • Tailwind CSS
  • AWS
Like Trello is a web app that allows you to create boards, lists and cards. This project was created using next js, aws amplify, dynamoDB, tailwind CSS. I stopped working the BD because of the cost, but if you want i can re-enable it, just let me know.
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Courses Landing Page

  • Next.js
  • Tailwind CSS
Landing page for a course platform. This project was created using Next js, Tailwind CSS.
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CopyGenius - Co:here Hackaton 2023

  • Next.js
  • Tailwind CSS
CopyGenius is an artificial intelligence tool designed to generate effective marketing copy, it also integrates other functionality to create product descriptions. CopeGinius web app created using next js, in order to participate in the co:here hackaton of midudev. Actually is not working bacause need to pay the API.
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Encripter app

  • Tailwind CSS
  • React
Encripter app is a web app that allows you to encrypt and decrypt messages using the Caesar cipher. This project was created using React, Tailwind CSS and Github pages.
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Metacritic Clone

  • Tailwind CSS
  • React
Metacritic clone is a mobile app, web app that allows you to search for movies and series, see their ratings and reviews. This project was created using React native, Natiwind CSS.
project screenshot

Calculator clone

  • React
Calculator clone is a mobile app, web app that allows you to perform basic mathematical operations. This project was created using React native

Contact

Get in touch with me