YOON JONG RYU

Software engineer focused on scalable UI systems, on-device security, and autonomous AI agent architectures. • Architects LLM agent harnesses (Brain) with autonomous tool calling, multi-layer guardrails, and self-correction loops • Designs component-driven design systems and multi-locale web platforms using TypeScript, React 19, Next.js 16, and Storybook • Shipped SeedVault to Google Play: an on-device zero-knowledge security vault powered by Argon2id and AES-256-GCM • Develops offline-first PWAs and on-device privacy-preserving vision systems Independently delivers end-to-end — from systems architecture and cryptography to AI orchestration and live app store releases.

The first installment of the ABILITY series. A premium productivity timer that transforms boring focus sessions into a superpower-like experience through immersive UI, persistent display, and focus visualization.

A design system engineered to validate a core hypothesis: whether abstract philosophical frameworks—specifically Yin-Yang and the Five Elements (Wuxing)—can logically structure and govern modern UI/UX design rules. Built entirely on Web Components to guarantee native framework-agnostic flexibility while providing an AI-driven layout composition environment using structured token-skill guides.

Following the discontinuation of a crypto wallet project due to legal and regulatory barriers, its core cryptographic vault mechanism was extracted into an independent, serverless mobile security app protecting seed phrases and private keys with Argon2id and AES-256-GCM, successfully published on Google Play.

A minimalist productivity platform that transforms repetitive daily routines into a structured spiritual "Cultivation" experience through a core-dependent data architecture, vanilla CSS, and atomic state management.

A lightweight memo and planner application designed to validate scalable UI architecture and offline-first UX using Component-Driven Development with Storybook.

Designed and implemented a UI-architecture–centric portfolio platform where resumes and work histories are rendered from structured data through reusable, isolated UI components. The project focuses on component contracts, styling predictability, and long-term scalability rather than page-level composition.

An open-source headless swipe library designed with a framework-independent architecture. It provides pure, high-performance swipe logic without imposing UI or styling constraints, enabling seamless integration with any design system.

A frontend utility library designed for maximum reusability and type stability. It standardizes core business logic into a single, type-safe layer to reduce duplication and prevent runtime errors across multiple projects.