Fullstack JavaScript Developer · React · Next.js · Node.js
Bucaramanga, Colombia · Open to remote opportunities (LATAM & international)
LinkedIn · nelsonluengas2@gmail.com

Fullstack JavaScript Developer with 3+ years building production web applications and leading technical teams across Fintech, logistics, and marketplace platforms. Strong backend foundation in REST API design, JWT authentication, role-based access control, and database modeling with PostgreSQL and MongoDB.

I apply Clean Architecture, SOLID principles, and MVC to build maintainable, scalable, and business-oriented systems. Currently leading a full rebuild of Smart Women (smartwomen.io) — a freelance marketplace for female talent — introducing real-time features via WebSockets, a new design system, and agile project management workflows.

Also a Fullstack JavaScript Instructor at Desafío Latam, having trained 300+ developers across multiple cohorts in React, Node.js, REST APIs, authentication, and production-ready development practices.

Frontend · React · Next.js · TypeScript · Vite · Tailwind CSS · HTML/CSS · jQuery
Backend · Node.js · Express.js · Nest.js · REST APIs · WebSockets
Databases · PostgreSQL · MySQL · MongoDB · Sequelize
Architecture · Clean Architecture · SOLID · MVC · Vertical Slicing
Auth & Security · JWT · Cookie-based auth · RBAC · Middleware validation
CMS & Other · WordPress (custom themes & plugins) · PHP · Git · Figma

Marketplace platform connecting clients with female freelance talent.
Live: smartwomen.io · Staging (rebuild): clean.smartwomen.io

Currently leading a full platform rebuild. Key features in progress:

• Real-time notifications and internal chat using WebSockets
• Threaded messaging per project, service, and client engagement
• Agile project management workflows for complex freelance engagements
• Job board for companies to publish open positions to freelancers
• Email notification system and role-based access control
• 120+ registered freelancers on current production platform

React Node.js WordPress WebSockets REST APIs PostgreSQL

Transport and logistics company operating in Argentina and 5 additional countries.
Live: calicosa.com.ar (private repo — client project)

• Built from scratch in pure PHP/WordPress (no page builders)
• Dynamic national coverage map with interactive route visualization
• Smart contact form routing inquiries to departments by coverage area
• User registration system and multilingual support (i18n)
• Defined brand design system, color palette, and UI component library
• SEO optimization improving organic search visibility and page load times

WordPress PHP JavaScript REST API Integration SEO i18n

Early-stage Fintech platform. (private repo — company project)

• Designed and implemented secure REST APIs with JWT authentication and RBAC
• Modeled and optimized relational databases for financial data
• Developed reusable NPM libraries for shared components across the platform
• Built and integrated a WordPress plugin to evaluate user credit availability in real time
• Configured and managed VPS deployment and server infrastructure for production
• Designed UI prototypes in Figma

Node.js Express PostgreSQL JWT WordPress PHP NPM Figma VPS

Blockchain product for a US-based company. (private repo — company project)

• Developed NFT marketplace features using Next.js
• Integrated crypto wallets: MetaMask, Phantom, and Tezos
• Built responsive UI components with Tailwind CSS

Next.js Tailwind CSS MetaMask Phantom Tezos Blockchain

Fullstack JavaScript Instructor since August 2023.
300+ students trained across multiple cohorts.

Each cohort covers:

• HTML, CSS, JavaScript fundamentals
• React with Vite, routing, private routes, cookie-based authentication
• Node.js, Express, MySQL, Sequelize, MVC architecture
• JWT authentication and authorization, RBAC, middleware validation
• REST API design, file uploads, form handling with backend storage
• Capstone marketplace project simulating real production workflows

Browse teaching repos and cohort exercises throughout this profile — they reflect the depth and breadth of what gets covered each generation.

• Full rebuild of Smart Women platform (new architecture, design system, real-time features)
• Deepening microservices patterns with Nest.js
• Improving testing strategies (unit + integration)

Email: nelsonluengas2@gmail.com
LinkedIn: linkedin.com/in/nelsonluengas