Carlos de Leon
Specializing in Next.js, MongoDB & Firebase integrations
Hi! I'm Carlos De Leon, a Software Engineer currently working as a Fullstack Developer at a technology-driven tourism company operating in Mexico and the Dominican Republic. Transitioning from over 10 years as a COO and General Manager in the restaurant industry, where I led teams of up to 100 people and managed operations with USD 1.5 million in monthly revenue with 30% profit margins.
Today, I build responsive web applications using Next.js, React, TypeScript, Tailwind, MongoDB, JWT, and RESTful APIs, focusing on clean code and intuitive UI/UX. My operations background brings project management, data-driven decision making, and high-performance skills under pressure to every technical challenge I take on.
Experience
Fullstack Developer
Tourism Tech Solutions • Mexico & Dominican Republic
- Currently working as a Fullstack Developer building production-ready web applications with a strong focus on scalability, security, and user experience for real-world projects using Next.js, React, TypeScript, Tailwind CSS v4, MongoDB, JWT, and modern APIs.
- I have designed and implemented end-to-end frontend and backend architectures, including secure authentication, role-based access control, Zod validation, state management with TanStack Query, and professional deployments.
- Self-taught engineer with a product-driven mindset, trained through official documentation, deep technical reading, complex projects, and coding standards used in professional environments.
- Multilingual communicator: Spanish (native), English (C1), Portuguese (B1) , enabling clear technical collaboration with international teams and clients.
- I leverage over 10 years of executive leadership and operational management to make sound technical decisions, prioritize effectively, maintain business alignment, and deliver reliable software under pressure.
Stack
Frontend:
- Next.js
- React
- Typescript
- Javascript
- Tailwind
Backend:
- Node.js
- JWT
- Zod
- TanStack Query
- Shopify API
Database and Storage:
- MongoDB
- Mongoose
- Vercel BLOB
- Firebase
Tools & Integrations:
- Astro
- Vite
- Firebase
- Shopify
- Postman
- i18Next
- Figma
- Framer Motion
- Shadcn/UI
- Prettier
- Git
- GitHub
- Linux
- NPM
- Vercel
Projects
ThreadHive
A next-generation community platform combining social discussion with gamification and complete brand identity. ThreadHive demonstrates end-to-end product development from strategic naming and visual design to full-stack implementation. Features include: WoolPath achievement system with 200+ custom-designed badges, NSFW content detection using TensorFlow.js, real-time notifications via Firebase, rich text editing with Tiptap, comprehensive moderation tools with role-based access, and privacy-controlled communities. Tech stack: Next.js 15, React 19, MongoDB, Redux + Zustand + TanStack Query for state management, JWT authentication, and Vercel deployment. Includes complete custom branding (mascot design system, naming strategy, visual identity) conceptualized and executed alongside technical development.
BeeHealth
A full-featured medical practice management platform built for multi-specialty clinics. Handles patient records, appointments, clinical workflows, inventory, and accounting with role-based access for doctors, employees, and patients.
FitWorld Shop
Modern, responsive e-commerce storefront built with Next.js, Tailwind CSS, and Shopify Storefront API. Features clean UI, advanced product browsing, customer reviews with images, wishlist via Firebase, and scalable PWA support with offline use and iOS 'Add to Home Screen' install.