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Pengfan Chang (John)

Crypto-friendly mobile engineer and outdoor research storyteller

I design privacy-first payment flows, resilient field apps, and Astro-powered publishing systems guided by time outside the lab.

GO Shipping Kotlin + Swift features, NOWPayments subscriptions, and data automations for indie media teams.

AN

Android Lab

Jetpack Compose + Kotlin craftsmanship

AP

Apple R&D

SwiftUI explorations on macOS & iOS

DX

Data Ops

Excel · SQL · Python automation loops

FN

Field Notes

Outdoor research fueling product ideas

terminal
SH $ whoami
Hacker, Researcher, Postgraduate @ Shanghai University
EC $ echo "Happy hacking and adventuring!"
Happy hacking and adventuring!
LS $ ls skills/
Java Kotlin Swift Python SQL Excel
ED $ echo $EDITOR
Emacs
PS $ ps aux | grep projects
Building amazing open source projects...
DV

Daily Verse · Holy Bible (KJV)

2 Peter 3:10-11

Read in context
““But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up. Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness,””

Verse supplied by BibleGateway.com (KJV) with offline fallbacks for reliability.

ST Skills & Technologies

Java
Kotlin
Swift
Python
SQL
Excel
Pandas
Data Viz

CF Current Focus

AK

Android & Kotlin

Compose-first product experiments with secure deliveries.

SW

Swift & SwiftUI

Native experiences tuned for macOS, iOS, and watchOS.

DP

Data Pipelines

Excel models, SQL warehousing, and resilient ingestion scripts.

DD

Decision Dashboards

Polished visual stories that elevate analytics.

IN Interests

Android apps powered by Kotlin & Java
SwiftUI experiments across Apple devices
Data storytelling with Excel, SQL, and Python
Mountain hiking & outdoor adventures

FP Featured Projects

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Google Chrome Extension for enhanced browsing with journal ranking and AI-powered summaries

Chrome Extension AI Integration Academic Research

Adobe After Effects tutorial for creating stunning 3D traditional Chinese ink-style text effects

Adobe After Effects 3D Animation Video Tutorial

One Tool, Multiple Solutions - Replace dozens of separate utilities with a single, powerful CLI.

Python

No description available

Python

No description available

Shell

Connect

LinkedIn: pengfan-chang
GitHub: @JohnThre
Email: jnc at freew.org

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