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Senior Software Engineer

John PaulCas

11 yrs · Android · Kotlin · Clean Architecture · 1M+ downloads shipped

Senior mobile engineer building Android apps that hold up in production. Currently building mobile banking features at Bank of the Philippine Islands (BPI).

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about.md

Profile

Senior mobile engineer with 11 years of software engineering experience, specializing in Android. Strong expertise in Kotlin, Java, MVVM and Clean Architecture, with a proven record of building and maintaining production-grade mobile applications across startups and enterprise environments.

11 yrs
software engineering
1M+
downloads shipped
4 yrs
smart contracts in production
experience.log

Where I've worked

8 roles · 11 yrs
Feb 2026 — Present7 mos

Bank of the Philippine Islands (BPI)

Senior Android Developer

  • Builds Android mobile banking features in Kotlin using MVVM/MVI and Clean Architecture.
  • Implements API integrations and data layer logic with repository patterns and coroutine-based asynchronous programming, inside a modularized codebase.
  • Drives code quality through code reviews, architecture discussions and unit tests that keep the app stable and maintainable.
  • Breaks down user stories with the Scrum Master into development-ready tickets, and coordinates with QA through testing, validation and release readiness.
KotlinMVVMMVIClean ArchitectureCoroutinesRetrofit
Jan 2022 — Jan 20264 yrs 1 mo

Sovrun (formerly BreederDAO)

Senior Software Engineer

  • Led development of production-grade smart contracts for prediction market platforms.
  • Designed and integrated Account Abstraction using Pimlico and Privy.
  • Conducted code reviews, architecture reviews and security assessments.
  • Mentored junior engineers.
  • Wrote unit, fuzz and integration tests across the contract suite.
SolidityFoundryHardhatAccount AbstractionERC-20ERC-721
Mar 2021 — Nov 20219 mos

Quantrics (Bell Canada)

Mobile Engineer (Android)

  • Developed and maintained features for a large-scale production Android application inside a modularized codebase.
  • Collaborated closely with QA and Product teams, contributing unit tests, bug fixes and code quality improvements for stability and scalability.
KotlinAndroidUnit Testing
Nov 2018 — Mar 20212 yrs 5 mos

XLD Tech Labs, Inc.

Senior Mobile Engineer (Android)

  • Built and maintained production Android applications from launch to over 1M+ downloads.
  • Led feature development and long-term maintenance in Kotlin, following MVVM and clean coding practices.
  • Worked closely with product, design and QA teams to deliver stable, user-focused releases.
KotlinMVVMAndroid
Mar 2018 — Nov 20189 mos

MergeCommit

Software Engineer

  • Built trading-workflow interfaces for blockchain exchange applications in React and TypeScript, integrating exchange features with the backend team.
ReactTypeScript
Sep 2017 — Mar 20187 mos

Cambridge University Press

Software Engineer

  • Built an R&D real-time quiz platform (Kahoot-like) on Firebase Realtime Database and Authentication, with live user interactions and scoring.
FirebaseRealtime Database
Feb 2017 — Aug 20177 mos

MyPortal Exchange

Mobile Android Developer

  • Built an Android application from scratch in Java, working directly with clients on requirements through to production readiness.
JavaAndroid
Sep 2015 — Feb 20171 yr 6 mos

Ivant Technologies

Java Developer

  • Developed and maintained Android applications in Java, from initial requirements through to production release.
JavaAndroid
skills.kt

What I work with

Mobile engineering

primary focus
  • Android Development
  • Kotlin
  • Java
  • Jetpack Libraries
  • Clean Architecture
  • Modularization
  • MVVM, MVI
  • Kotlin Coroutines
  • DI (Hilt, Koin)
  • Retrofit, Ktor
  • Unit & Integration Testing
  • Charles Proxy
  • SonarQube
  • CI/CD Pipelines

Blockchain

2022 — 2026, in production
  • Solidity
  • EIP standards (ERC-20, ERC-721)
  • Foundry
  • Hardhat
  • Account Abstraction
  • Unit, fuzz & static analysis

Languages

shipped in production
  • Kotlin
  • Java
  • Solidity
  • Rust
  • TypeScript

Tools

daily setup
  • Android Studio
  • Neovim
  • Zed
  • VS Code
  • Docker
  • Git
projects/

Selected work

Currently building

Android and Kotlin Multiplatform samples are in progress and land here as they ship. The repositories are open in the meantime.

github.com/johnpaulcas →
education.md

Education

2011 — 2015

Bicol University Polangui Campus

BS in Information Technology

contact.ts

Get in touch

Open to conversations about Android and Kotlin work. The quickest route is email — the full CV is one click away.

casjp.app@gmail.comDownload CVLinkedInGitHub

Philippines · GMT+8