JM de Leon — Developer

Capabilities

What I do

Full-stack developer focused on building everything from lightweight JavaScript utilities to complete product experiences.

⚡

Frontend Engineering

Performant, interactive UIs with clean, maintainable code. Vanilla JS to modern frameworks.

JavaScriptTypeScript ReactReact-NativeFigma

🔧

Backend & APIs

Server-side systems, REST APIs, and database driven apps built for scale and reliability.

Node.jsC#PHP MySQLSQL Server

🚀

Product Development

Taking ideas from concept to launch, architecture, implementation, and iteration.

SaaSMVPsFull-Stack

📱

React Native

Ship cross-platform iOS and Android apps with React Native. I build performant mobile experiences and integrate native modules when needed.

ExpoiOSAndroid

🛒

Shopify

Build apps, custom storefronts with Liquid templating, Storefront API integrations, and theme development for seamless ecommerce experiences.

ShopifyLiquidStorefront APIShopify App

🌐

Three.js / 3D Web

Creating immersive 3D experiences on the web using Three.js, and other modern web technologies.

Three.js3DWeb

📍

GIS & Mapping

Analyzing and visualizing spatial data using GIS tools and mapping libraries for insightful geospatial solutions.

GISQGISArcViewMappingSpatial DataGeospatial

⛓️

Blockchain & Web3

Smart contract integration, NFT platforms, and Web3 frontend experiences, connecting decentralized protocols to polished UIs.

Web3NFTSolidityEthers.js

Selected Work

Things I've built

From open-source utilities to full product experiences — a selection of what I've shipped.

Open Source Library

webtour.js

                    👋 Step 1 of 3 — Click here
                    

Zero deps Vanilla JS npm

01 — Open Source

webtour.js

⭐ 54 stars 🍴 20 forks

A lightweight, zero dependency step-by-step user guide library for websites. Helps onboard users with interactive product tours and guided walkthroughs without the bloat.

Vanilla JSUX Librarynpm

View on GitHub ↗

02 — Product

Metaprints

Live Product Full-Stack

A digital product platform built from the ground up, translating Figma designs into pixel-perfect HTML with a strong focus on user experience, covering everything from frontend interfaces to backend systems.

Full-StackProduct Web AppSaaSFigma

Visit site ↗

03 — Web3 / Metaverse

Metaprints 3D Avatar

Metaverse 3D Figma

A landing page for Metaprints' 3D avatar blueprint, showcasing cross-metaverse digital identity assets with rich visuals and interactive elements.

HTML/CSSFrontend Metaverse3D

04 — Web3 / Campaign

Metaprints Lunar 2022

Campaign NFT

A limited-edition Lunar New Year 2022 campaign. Year of the Tiger collectibles for The Sandbox metaverse, with rich cultural visuals and storytelling.

HTML/CSSFrontend NFTCampaign

05 — Product

PolkaPet Games

Full-Stack

A game-focused web interface with a playful visual direction and responsive layout, built for smooth browsing and a polished product feel.

UI/UXFrontend Web AppResponsive

06 — Web3 / Analytics

Seafloor

NFT Web3

NFT floor price and rarity analysis built for collectors—quick insights across collections with a clean, dark UI.

Web3NFT AnalyticsFrontend

07 — Game / Web3

Dark Frontier

Web3 Frontend

A dark sci-fi web experience for a blockchain space-shooter game. Cinematic video backgrounds, responsive layout, and an immersive visual identity built for Web3 audiences.

HTML/CSSFrontend Web3Video

08 — Brand / Web3

Curry Brand

NFT Brand

A polished NFT brand site featuring video-backed hero sections and smooth storytelling—built to present a high-profile digital collectibles campaign. (Recreated from original website)

HTML/CSSFrontend NFTVideo

I'm Julious, a
Web Developer

What I do

Things I've built

GitHub Contributions

I'm Julious, aWeb Developer

What I do

Things I've built

GitHub Contributions

I'm Julious, a
Web Developer