Yongchivo
Projects
A selection of academic, personal, and upcoming projects across cyber security, web, mobile and game development.
Cyber Security & Forensics
Personal Portfolio with Security Hardening

Personal Portfolio with Security Hardening
LIVE

The site you are reading right now. Built with Astro, Tailwind and Cloudflare Pages, with continuous deployment from GitHub. Hardened HTTP security headers from grade D to A on securityheaders.com by configuring HSTS, Content-Security-Policy, X-Frame-Options, Permissions-Policy and other defences.
Yongchivo Tools

Yongchivo Tools
LIVE

A hub of free, bilingual (EN/ES) cybersecurity micro-tools at tools.yongchivo.com — eight tools now live. Client-side utilities that run entirely in the browser: Password Generator, Password Strength Analyzer, Subnet Calculator, an EXIF Viewer that surfaces the camera, timestamp and GPS position hidden in a photo, a PDF Metadata Editor that inspects and strips the author and software fields left in a document, and a 'Which cyber role are you?' quiz; plus two Cloudflare Worker-backed tools — a Security Headers Checker (with strict SSRF-safe URL validation) and a Breach Checker (XposedOrNot). Built with Astro, Tailwind and Cloudflare Workers, with automatic deploys and its own A-grade security headers.
File Converter — Private, In-Browser

File Converter — Private, In-Browser
LIVE

A privacy-first file converter living at yongchivo.com/convert, built into this portfolio for SEO with a dedicated, keyword-targeted page per conversion. Converts images entirely in the browser — PNG ↔ JPG, PNG ↔ WebP, JPG ↔ WebP, plus HEIC → JPG/PNG for iPhone photos (Canvas API, with the libheif WASM for HEIC) — and data formats: CSV, JSON, YAML and XML, in every direction, with graceful errors on malformed input. Drag-and-drop, paste, batch and instant download; nothing is ever uploaded. Bilingual (EN/ES) on a single reusable conversion engine, structured so document and audio formats slot in next.
Analytics Dashboard

Analytics Dashboard
LIVE

A dashboard at yongchivo.com/analytics that reads the CSV exports the platforms already give you and visualizes what their own dashboards don't show. For Google Search Console: a CTR-against-position scatter that separates a wasted ranking from a real opportunity, a ranking distribution, and a genuine side-by-side of two date ranges. For App Store Connect: downloads and revenue together on a dual-axis chart, the full impressions → product page views → downloads funnel with the drop-off at each step, and day-of-week performance. Bilingual (EN/ES), parsed with Papaparse and drawn with Chart.js entirely in the browser — nothing is ever uploaded. Built one preset module per platform, so a new source is a parser and a list of views rather than a rewrite.
Mobile & Web Development
PHV Prep UK — iOS Exam Prep App

PHV Prep UK — iOS Exam Prep App
LIVE

My first app submitted to the App Store: exam preparation for the Wolverhampton private hire vehicle ("taxi badge") licensing test. 300+ practice questions, realistic timed mock exams that mirror the real exam's pass logic, and an AI tutor for UK taxi law. Built solo with Flutter and Firebase (Auth, Firestore, Cloud Functions, europe-west2). Security-focused: server-side StoreKit 2 purchase verification, the Anthropic API key kept entirely server-side in Secret Manager (never shipped in the client), Firestore rules locking premium status to the backend, and content-safety controls on the AI feature.
MyLocation — Android App

MyLocation — Android App
COURSEWORK

A location-aware Android app backed by Google Firebase, with user authentication and real-time data storage to sync locations and events across devices. Built in Java/Kotlin as part of the Mobile Application Development module.
Game Development & Systems
BlackDogHunter — 2D Game

BlackDogHunter — 2D Game
COURSEWORK

A complete 2D game built in Unity with C#, covering game mechanics, sprite animation, scene management and level design. Originally developed as a group academic project where the deliverable was a team report — the codebase itself was built from scratch by me.
University Kiosk Operating System

University Kiosk Operating System
COURSEWORK

A locked-down kiosk OS based on Ubuntu, with auto-login, restricted user environment and start-up scripts to deliver a reliable single-purpose public terminal. Built as part of the Operating Systems module to explore Linux administration, security policies and system hardening.
© 2026 John Akhis Moreno (Yongchivo)
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