Sonny Lozano Jr.

Full-Stack Software Developer

Available for remote work · UTC+8 · Philippines

I build web and mobile apps, then ship them.

Full-Stack Software Developer

Six years building and shipping web and mobile apps, freelance since November 2020 and more than four years on agile teams. I work in React, Next.js, React Native, Flutter, TypeScript, and NestJS or Node.js with MongoDB, and I deploy on AWS with CI/CD. I have published apps on Google Play and the App Store and led a small team.

Turn Vertical
Turn Vertical marketing site with the headline We all have a story and links to the app stores.
  • React
  • Next.js
  • TypeScript
  • React Native
  • Expo
  • Flutter
  • NestJS
  • Node.js
  • MongoDB
  • AWS
  • Docker
  • Firebase

Selected work

Apps I have shipped.

Experience

6 years of shipping.

  1. Jan 2026 – Oct 2026

    Senior Full-Stack Developer

    Zion Systems & Build

    Full-time contract, remote

    Led a small team. Owned Turn Vertical from requirements through production.

    • Led the architecture, authentication and role-based access, AWS deployment, CI/CD, and store releases.
    • Shipped the Flutter app, a React and TypeScript admin platform on Mantine, and a NestJS backend with MongoDB and Firebase.
    • Integrated Stripe donations, Sentry, and a WordPress sync for approved videos, metadata, and thumbnails.
    • Flutter
    • React
    • TypeScript
    • Mantine
    • NestJS
    • MongoDB
    • Firebase
    • AWS EC2
    • Docker
    • GitHub Actions
    • Stripe
    • Sentry
    • WordPress
  2. Apr 2022 – Dec 2025

    Frontend Developer (full-stack scope)

    Prosperna

    Full-time, remote

    E-commerce SaaS for Philippine entrepreneurs. Mobile apps, the Next.js storefront, and Node.js microservices.

    • Redeveloped Pay-GPWA, the utility-billing app for Guam Power Authority and Guam Waterworks Authority, in React Native and Expo.
    • Maintained the Okada Manila Flutter app and fixed issues from a third-party penetration test.
    • Built and maintained the Prosperna Flutter app with one other mobile developer, plus Next.js storefront features including product variants and HubSpot event tracking.
    • Built Node.js and MongoDB REST APIs in a microservices architecture, with Jest, React Testing Library, and Vitest.
    • React Native
    • Expo
    • Flutter
    • Next.js
    • Node.js
    • MongoDB
    • Jest
    • Vitest
  3. Nov 2020 – Present

    Full-Stack Developer

    Freelance

    Freelance, remote

    Web and mobile apps for startups and businesses, from requirements through hosting and release. Runs alongside the positions above.

    • Shipped Insure Sphere and Benefeed Ecoupon.
    • Built WordPress and Elementor sites, and handled hosting and releases on Hostinger, AWS EC2, and AWS Lightsail.
    • Implemented Socket.IO on the Benefeed and Gwana front ends.
    • Part-time manual QA for Doobert on an animal-transport tracking web app for the ASPCA.
    • React
    • TypeScript
    • Mantine
    • NestJS
    • Node.js
    • MongoDB
    • React Native
    • Flutter
    • WordPress

Skills

The stack I work in.

  • Frontend

    • React
    • Next.js
    • TypeScript
    • JavaScript
    • HTML
    • CSS/SCSS
    • Tailwind CSS
    • Mantine
    • Material UI
    • Redux
    • Zustand
  • Mobile

    • React Native
    • Expo
    • Flutter (Dart)
    • Google Play and App Store releases
  • Backend

    • Node.js
    • NestJS
    • REST
    • Socket.IO
    • MongoDB
    • MySQL
    • Firebase
  • DevOps

    • AWS (EC2, Lightsail)
    • Docker
    • Dokploy
    • Nginx
    • PM2
    • GitHub Actions
    • MongoDB Atlas
  • Testing and monitoring

    • Jest
    • React Testing Library
    • Vitest
    • Sentry
  • Integrations

    • Stripe
    • HubSpot
    • WordPress
  • Tools

    • Git
    • GitHub
    • ClickUp
    • Jira

About

Rosario, Cavite.

Six years building and shipping web and mobile apps, freelance since November 2020 and more than four years on agile teams. I work in React, Next.js, React Native, Flutter, TypeScript, and NestJS or Node.js with MongoDB, and I deploy on AWS with CI/CD. I have published apps on Google Play and the App Store and led a small team.

  • Rosario, Cavite, Philippines · UTC+8
  • BS Information Technology, Cavite State University CCAT, 2022
  • English: Conversational
  • Available for roles and client projects

Contact

Tell me about the work.

A remote role, a contract, or a product you want shipped.

Or email me directly. sj.lozano14@gmail.com