Sertiku. Certificates anyone can verify.
A platform for issuing, managing, and verifying digital certificates with QR Code, Solidity, Blockchain, and IPFS technology.
- Laravel
- Solidity
- JavaScript

Ideas I built and shipped.
Web apps, platforms, and tools I build for myself and for the businesses I work with — from the first sketch to deployment. Hover the name; scroll to travel through every project.
Under the hood
Each product gets the stack it needs — Next.js, Tailwind CSS, JavaScript, TypeScript, Astro, React, Solidity, Stockfish, Userscript, Nuxt, Laravel, Flask, and 16 more. 20 of them are live at public URLs.
A platform for issuing, managing, and verifying digital certificates with QR Code, Solidity, Blockchain, and IPFS technology.

A studio website for company sites, landing pages, internal web apps, backend APIs, databases, and deployment.

A catalog of 296 Bogor destinations with search, filters, maps, routes, and semantic recommendations.

An AI health platform for medication schedules, food scanning, PWA reminders, and patient and clinician dashboards.

A photography and digital marketing website with a responsive layout.

A Chrome extension helper for GeoGuessr with exact placement, adjustable score ranges, and an embedded map preview.

Brand landing page for TuneBoss ECU motorcycle tuning that sends riders to the TuneBoss app on iOS and Android and to the online store.

Online store for TuneBoss ECUs, flash kits, quickshifters, data loggers, and tuning accessories for Honda, Yamaha, Kawasaki, and Suzuki motorcycles.

Study program service management app for Universitas Amikom Yogyakarta, where users sign in with an Amikom Google account and rate the services they used.

AI tools for Indonesian news and politics: an AI-agent news timeline and a sentence labeler for Prabowo speeches.

An X-style timeline where every account is an AI agent posting about Indonesian news, and anyone can connect their own agent.

Paste a YouTube link to a Prabowo speech and each sentence gets a label, such as promise or data claim, mapped to its second in the video.

A donation platform on BNB Smart Chain where donors follow campaign funds, read AI-generated impact reports, and check impact certificates by hash.

A web app for chess players to play offline, import chess.com games or PGNs, follow live games, and get Stockfish game reviews.

A Chrome and Edge extension that draws Stockfish move arrows on chess.com and lichess.org boards and relays positions to the Chess Analyzer web app.

A Tampermonkey and Violentmonkey userscript for chess.com and lichess.org that shows top engine moves and relays live games to the web app.

A searchable list of GeoGuessr custom map challenges that players can open without logging in or paying.

A web dashboard that takes a copied user ID and shows the active GeoGuessr round's coordinates and reverse-geocoded address.

A Tampermonkey userscript for GeoGuessr that reads the active round location, shows a map preview, and can place guesses automatically.

A legacy archive of mod menus and scripts for Mobile Legends, with modules such as Radar Map, Drone View, and Room Info.
Visit ml.0xpnj.dev(opens in a new tab)
A local Python bot that farms both Clash of Clans villages on an LDPlayer emulator through ADB and OpenCV.

Articles on product development, AI agents, and programming, written in English and Indonesian.
Visit peenjeee.tech(opens in a new tab)
A link page that collects CV, LinkedIn, GitHub, projects, and social profiles, with a public chatroom and an AI assistant.

A single-page portfolio of personal and client web projects, with a scroll-driven three.js scene and a particle text hero.

And many more
They are sensitive or private personal work. The full list is on GitHub.
All repositories(opens in a new tab)What's next
Personal idea or business product — reach me on GitHub.