name: Efren James Centeno
role: Front-End Developer @ C3 Interactive Manila
location: Cabuyao, Laguna, Philippines
education: Associate in Computer Technology - Bulacan State University
currently:
- Building React-based web solutions with TanStack Query, TanStack Table & shadcn/ui
- Learning the Laravel + API Platform backend stack
- Exploring state management patterns with Zustand & Jotai
previously:
- 3+ years at MYCURE building HIPAA-compliant healthcare apps
- Developed PWA handling 50K+ monthly appointments for 100+ organizations
- Provided end-user training & support, reducing reported issues by 60%
fun_fact: I built GPXShadow — a web app that turns your Strava routes into art 🚴♂️2022 ─── MYCURE ──────────────────────────── 2025 ─── C3 Interactive ───▶ Present
│ │
├─ Vue.js / Nuxt.js / Quasar ├─ React 19 / TanStack / shadcn/ui
├─ HIPAA-compliant healthcare PWA ├─ Zustand / Jotai state management
├─ Client training & product demos ├─ Laravel + API Platform (learning 📖)
└─ QA testing (Cypress + Manual) └─ Figma → React workflows
- 🏢 Front-end development at C3 Interactive Manila — React, TanStack, CMS & SEO
- 🖊️ Managing and maintaining website content for various clients — keeping pages accurate, updated, and on-brand
- 🧩 Chrome Extensions — building a suite of developer tools (Base64, JWT, JSON, and more) for future Chrome Web Store release
- 🚴 GPXShadow — GPX/route visualization with Strava API integration
- 🌐 ejcenteno.dev — portfolio updates & improvements
- ⚛️ Advanced React patterns — hooks, compound components, render optimization
- 🗄️ Laravel + API Platform — understanding REST API design from the backend side (new territory!)
- 🎨 Advanced CSS animations & modern UI/UX patterns
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Web app converting GPX fitness tracks into customizable silhouette images with Strava API integration. Vue.js • Tailwind CSS • Firebase • Strava API |
Personal portfolio with automated CI/CD pipeline, Firebase Hosting, and SEO optimization. HTML • CSS • JavaScript • Tailwind CSS • Firebase • GitHub Actions |
A growing collection of developer-focused browser extensions built with vanilla JavaScript. Chrome Web Store release coming soon.
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🖼️ Save Image as Type Save images directly in your preferred format from the right-click menu. 
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🔤 Text Case Converter Instantly convert selected text between camelCase, snake_case, UPPER, and more.
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🔐 Base64 Encoder/Decoder Encode and decode Base64 strings right from the browser toolbar.
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🪙 JWT Encoder/Decoder Inspect and decode JWT tokens without leaving the browser.
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📋 JSON Formatter & Validator Prettify and validate JSON payloads instantly in the browser.
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🎨 Image Format Converter Convert images between formats (PNG, JPG, WebP, etc.) directly in the browser.
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