Music utility
KantaHub
A mobile-first music hub concept for discovery, saved favorites, and smooth content browsing.
Compose
API-ready
Media UX
Case study soon
Mobile command center
John Rei Cabunas builds mobile apps that last.
Mobile Engineer focused on Kotlin, Jetpack Compose, KMP, Compose Multiplatform, scalable architecture, performance, and teams that ship with calm confidence.
- Kotlin
- Android
- Jetpack Compose
- KMP
- Clean Architecture
Featured apps
Product ideas shaped for real mobile habits.
A focused showcase of apps and guides across entertainment, gaming knowledge, strategy, and routines.
Game companion
Dota Guide
A structured guide experience for hero knowledge, builds, counters, and quick match preparation.
Kotlin
Offline-first
Search
Case study soon
Strategy reference
TFT Guide
A companion for team compositions, item decisions, and patch-aware strategy browsing.
Data UI
Compose
Patterns
Case study soon
Productivity
Clockwise
A time and routine app direction built around clarity, planning, and lightweight daily momentum.
Scheduling
State
Clean UX
Case study soon
Expertise
The stack is mobile, but the craft is systems thinking.
Android
Kotlin
Java
Jetpack Compose
KMP
Compose Multiplatform
REST APIs
CI/CD
Testing
Performance
Architecture that survives growth
MVVM, Clean Architecture, modularization, dependency injection, and design patterns applied with a practical product mindset.
Interfaces that feel native and maintainable
Modern Android UI with Jetpack Compose, consistent design systems, reusable components, and responsive implementation details.
Delivery habits that protect quality
Code reviews, testing strategies, release management, debugging, performance optimization, and post-release support.
Experience
Nearly five years building, leading, and maintaining mobile apps.
2021 - 2026
Hero Apps Software Development Services
Technical Lead & Mobile Engineer
Led Android application architecture, code quality, delivery timelines, and release readiness while mentoring developers through planning, reviews, and engineering standards.
- Modernized UI with Jetpack Compose for consistency and delivery speed.
- Applied KMP and Compose Multiplatform to shared logic and cross-platform prototypes.
- Partnered with product and backend teams on API contracts and end-to-end features.
2015 - 2022
Mabini Colleges, Inc.
Bachelor of Science in Computer Science
Built the computer science foundation behind the engineering habits: analysis, software design, problem solving, and long-term learning.
Contact
Have a mobile product, Android role, or Compose-heavy challenge?
Reach out by email. I keep the public portfolio lightweight and focused, with deeper project details ready for the right conversation.