Hi, I'm Jon.
Learning out loud.
A quiet corner of the internet for my CCSP study notes, the small apps I build for fun, and the occasional thing I write down.
CCSP Study
// (ISC)² Certified Cloud Security Professional
Apps
// things I vibe-coded
Health Assessment ↗
Track and assess personal health metrics in one place.
Investment Backtester ↗
Backtest DCA and crash-buying strategies with XIRR and drawdown metrics.
Judges Timeline ↗
Interactive timeline of the judges in the Book of Judges.
NAPFA Calculator ↗
Calculate NAPFA scores for Singapore primary and secondary students.
Quadratic Graph Explorer ↗
Explore quadratic graphs step by step — built for Sec 2 Maths.
Retirement Calculator ↗
Model retirement savings with additional contributions and drawdown modes.
Rush Hour Solver ↗
Solve Rush Hour puzzles with step-by-step move guidance.
Blog
// notes & write-ups
About
// whoami
I'm someone who likes learning — currently working toward my CCSP, building small useful apps, and writing down what sticks. By day I'm an IT auditor based in Singapore, holding the CISSP, CISM, and CISA certifications. A Christian, passionate about personal and organisational development, communication, and leadership — also a Maxwell Leadership Certified Team Member and Maxwell Certified DISC Consultant. This is where I keep it all in one place.