
Cristian
Fullstack
About me
I'm , known online as , a self-taught developer from . I focus on creating and high- web applications, translating complex designs into functional code with strong and skills. I work with clients across various industries, providing effective technical solutions. In parallel, I nurture a strong passion for and technologies, actively exploring , , the protocol, and platforms like . My journey began in and post-production, evolving towards web development in . I firmly support and continue to expand my skills through personal projects showcased in my .
Skills & Tech Stack
This section outlines the and tools that I am proficient in
Frontend
ReactJS
NextJS
ViteJS
JavaScript
TypeScript
TailwindCSS
Backend
PostgreSQL
MongoDB
NestJS
ExpressJS
Tools
Git
Vercel
Supabase
Docker
Bash
Career History
My professional journey and experience
Mobile Developer
- Developed and maintained the main user interface and navigation for the Portal App using React Native and Expo
- Implemented authentication flows with the Nostr protocol and biometric login, improving onboarding and account security.
- Integrated QR code scanning and NFC for instant authentication and payment initiation.
- Enhanced user privacy by managing secure local storage of sensitive data with Expo SecureStore and SQLite.
- Collaborated with backend integration for real-time payment status and Nostr Wallet Connect features.

Portal Technologies Inc
Portal is developing a revolutionary decentralized identity and payment protocol. Our universal mobile app enables self-sovereign digital identity management, passwordless authentication, Lightning Network payments, and zero-knowledge proofs without platform lock-in.
Mobile Developer
- Developed and maintained the main user interface and navigation for the Portal App using React Native and Expo
- Implemented authentication flows with the Nostr protocol and biometric login, improving onboarding and account security.
- Integrated QR code scanning and NFC for instant authentication and payment initiation.
- Enhanced user privacy by managing secure local storage of sensitive data with Expo SecureStore and SQLite.
- Collaborated with backend integration for real-time payment status and Nostr Wallet Connect features.
Fullstack Developer
- Development and maintenance of the main interactive mapping platform using Next.js
- Implementation of new features to enhance the user experience of the online platform
- Resolution of bugs and technical issues to ensure the proper functioning of the platform
- Refactoring of existing components and code to improve performance and maintainability

Cityopensource
Cityopensource enables everyone to carry out collaborative projects storytelling by locating multimedia content, photos, video and audio, on interactive maps.
Fullstack Developer
- Development and maintenance of the main interactive mapping platform using Next.js
- Implementation of new features to enhance the user experience of the online platform
- Resolution of bugs and technical issues to ensure the proper functioning of the platform
- Refactoring of existing components and code to improve performance and maintainability
Frontend Developer
- Developed IoT device management dashboard UI for Tecnoalarm using Angular, implementing designs from Figma specifications
- Created new customer portal for Illumia energy company with React, enhancing user experience for account management
- Implemented responsive and intuitive interfaces following design system guidelines
- Collaborated with backend teams to integrate API endpoints for IoT device data
- Applied performance optimization techniques to improve application responsivenes

Enhancers - Tinexta Group
Enhancers - From raw pixels into finished products. We make digital products that really matter.
Frontend Developer
- Developed IoT device management dashboard UI for Tecnoalarm using Angular, implementing designs from Figma specifications
- Created new customer portal for Illumia energy company with React, enhancing user experience for account management
- Implemented responsive and intuitive interfaces following design system guidelines
- Collaborated with backend teams to integrate API endpoints for IoT device data
- Applied performance optimization techniques to improve application responsivenes
Frontend Developer
- Built projects in React and NextJS
- Project maintenance for clients• Built projects in React and NextJS
- Project maintenance for clients

Develops
Develops is your on-demand development team. Get the best out of your startup budget by working with talents from all over the world with our supervision.
Frontend Developer
- Built projects in React and NextJS
- Project maintenance for clients• Built projects in React and NextJS
- Project maintenance for clients
Fullstack Developer
- Designed and built a real-time notification system using Socket.io and NestJS
- Created a microservice architecture connecting Express.js backend with Angular frontend
- Developed real-time lead tracking functionality that displayed Facebook conversions via toast notifications• Designed and built a real-time notification system using Socket.io and NestJS
- Created a microservice architecture connecting Express.js backend with Angular frontend
- Developed real-time lead tracking functionality that displayed Facebook conversions via toast notifications
Frontend Developer
- Created responsive landing pages for TIM ad campaigns
- Implemented key features for the company's backoffice CRM solution using Angular
- Main company website maintenance

Entiende
Entiende S.r.l. provides communication services and manages data to build a strong and innovative network based on respect and professionalism.
Fullstack Developer
- Designed and built a real-time notification system using Socket.io and NestJS
- Created a microservice architecture connecting Express.js backend with Angular frontend
- Developed real-time lead tracking functionality that displayed Facebook conversions via toast notifications• Designed and built a real-time notification system using Socket.io and NestJS
- Created a microservice architecture connecting Express.js backend with Angular frontend
- Developed real-time lead tracking functionality that displayed Facebook conversions via toast notifications
Frontend Developer
- Created responsive landing pages for TIM ad campaigns
- Implemented key features for the company's backoffice CRM solution using Angular
- Main company website maintenance
Portfolio
This covers various technologies; visitors can explore or access the source code on Github

Expensify
Comprehensive personal finance tracker built with React Native & Expo in 24 hours! 📱

Task Manager Fullstack
A task management app built with cutting-edge tech for fluid user experience 🚀

Coffee Connoisseur
Geolocation based search for coffee shops 🌍
Blog
Occasional posts on interesting web development and insights

My Mad Adventure at the HackForHire Hackathon
From Zero to Hero (and Hired!) in 24 Hours 🕓
