SOFTWARE ENGINEER · EST. 2020
I'm John Ivan. Curiosity drives me to build stuff, and this is the shop where I keep it all: the builds, the tools, and the notes from the workbench.
EVERYTHING ON DISPLAY WAS BUILT BECAUSE I WONDERED IF I COULD
A marketplace that rescues near-expired food: buyers save money, sellers cut waste. Three separate Flutter apps (buyers, sellers, admins), a Django backend, and an AI recommendation system that bundles bargains from live inventory and sales data.
CONTAINS Flutter · Django · Supabase
Build Facts
Serving size 1 marketplace, 3 apps
INGREDIENTS: Flutter, Django, Supabase, AI recommendations.
BUILT BECAUSE
Good food was getting binned while people hunted for bargains.
An adaptive PhilNITS exam reviewer with web and mobile apps: an IRT engine picks each next question from your actual ability, and teachers get classroom tools to coach whole cohorts. Built after passing the exam myself.
CONTAINS Next.js · React Native · Supabase
Build Facts
Serving size 1 reviewer, web + mobile
INGREDIENTS: Next.js, React Native, Supabase, Gemini AI, IRT.
BUILT BECAUSE
I passed the exam and wanted the reviewer I wish I'd had.
A helpdesk ticketing system with background services that close idle tickets and nudge the forgetful. Led the backend: database design, SQL, the works.
CONTAINS C# · ASP.NET Core · SQL
Build Facts
Serving size 1 helpdesk
INGREDIENTS: C#, ASP.NET Core, SQL, JavaScript.
BUILT BECAUSE
Tickets kept going stale, so the system learned to chase them.
Feed it a PDF of study material, get a quiz back. An AI-powered web app for students who would rather be tested than reread.
CONTAINS AI · Python · JavaScript
Build Facts
Serving size 1 quiz per PDF
INGREDIENTS: AI, Python, JavaScript.
BUILT BECAUSE
Rereading notes is slow; getting quizzed is faster.
A hybrid language interpreter built from scratch: lexer, parser, semantic analyzer. Made to find out how programming languages actually work under the hood.
CONTAINS Java · Lexer · Parser
Build Facts
Serving size 1 language
INGREDIENTS: Java, Lexer, Parser, Semantic analysis.
BUILT BECAUSE
To find out how programming languages actually work under the hood.
Image compression with Huffman coding, implemented the long way. Curiosity about how zip files think.
CONTAINS Java · Huffman coding · Algorithms
Build Facts
Serving size 1 image, smaller
INGREDIENTS: Java, Huffman coding, Algorithms.
BUILT BECAUSE
Curiosity about how zip files think.
More curiosities in the back room: github.com/johnivanpuayap
CAREER, CHRONOLOGICALLY — LIKE COMMIT HISTORY, BUT FOR LIFE
APR 2025 — PRESENT
Shipping features across multiple products in Angular and Ionic, reviewing teammates’ code, fixing what testers and customers find, and nudging the team toward better practices.
JUN — AUG 2024
Led backend development on a helpdesk system: database design, SQL scripts, background services, and the project plan that held it all together.
2020 — 2023
Landing pages and small-business sites, built and maintained. Where the curiosity turned into a trade.
2022 — 2025
The fundamentals, properly installed — algorithms, systems, and the national exams to prove it.
EVERY TOOL ON THIS BOARD HAS BEEN USED IN ANGER
SCRIBBLES FROM THE WORKBENCH