William Pratama

CPaaS & Messaging

RCS, WhatsApp Business API, SMS, SIP/VoIP. End-to-end campaign management, telco partner coordination, and API documentation.

Full-Stack & Mobile

Python, Kotlin/Android, PHP/MySQL, TypeScript. Production apps from crypto bots to Korean learning tools.

Automation & Reliability

Real-money trading systems, habit engines, AI-powered upscaling, workflow automation. Systems that run 24/7.

Featured Projects

Real systems I've built, shipped, and maintain — each solving a concrete problem.

Trader Bot

Automated crypto trading with real-money execution, async order management, and risk controls running 24/7.

Python Async Crypto API

Wolemz Toolbox

Real-time phone performance monitor (FPS, CPU/GPU, thermal) with fast PC↔phone file transfer over sockets.

Android Python Sockets

Hangukeo

Offline Korean learning app with TTS pronunciation, daily streak engine, sentence patterns, and audio quizzes.

Kotlin Android TTS

Wolemz Gym

Habit-first home dumbbell workout tracker built on a 1,400-day "never zero" streak philosophy.

Java Android Habit Engine

FinTrack

Personal net worth and cashflow monitoring web app — track income, expenses, and financial health at a glance.

PHP MySQL Web

YouTube Downloader

Desktop GUI for downloading video and audio from YouTube — format selection, queue management, and ffmpeg processing.

Python yt-dlp ffmpeg

Photo Upscaler

AI-powered photo and video super-resolution using Real-ESRGAN and CodeFormer — restore and upscale with one click.

Real-ESRGAN CodeFormer AI

Messaging & CPaaS

Enterprise-grade RCS Campaign Manager, WhatsApp Business API coexistence engine, and SIP/VoIP carrier integrations.

RCS WhatsApp SIP

About

With 7+ years across messaging, VoIP, and API platforms, I work where engineering, product, and customers meet. Currently leading RCS end-to-end at B3Networks — from API integration through Campaign Manager, CDR reporting, and go-live — coordinating with engineering, billing, and telco partners like Singtel to move features from spec to production.

Beyond my professional work, I build systems on my own time: automated trading bots handling real money, Android apps powered by daily-streak habit engines, financial trackers, and AI-powered tools. Every project in this portfolio is something I built, use, and maintain.

Tech Stack

Python Kotlin Java PHP TypeScript Node.js MySQL REST API SIP / VoIP Android Git AI / LLM

Messaging & CPaaS Technical Lead · Systems Builder