Question 1

Who is ISA (Yoonjong Ryu)?

Accepted Answer

ISA (Yoonjong Ryu / 류윤종) is a Frontend & Mobile Security Engineer specializing in Component-Driven Development (CDD), scalable UI architecture, Progressive Web Apps (PWA), and on-device zero-knowledge cryptography.

Question 2

What is SeedVault and how does its security work?

Accepted Answer

SeedVault is an on-device zero-knowledge security vault mobile app published on Google Play (com.ryuislabs.seedvault). It encrypts mnemonic seed phrases and private keys using memory-hard Argon2id key derivation and AES-256-GCM envelope encryption without requiring remote servers or internet permissions.

Question 3

What is RyuisLabs?

Accepted Answer

RyuisLabs is an engineering studio platform founded by ISA that develops deep-tech products including on-device AI vision tracking (RYUis : STATUS) and privacy-preserving productivity suites.

Question 4

What core technologies are used in ISA Archive?

Accepted Answer

ISA Archive is built with Next.js 16 (App Router), React 19, TypeScript, Contentlayer2, Serwist (Service Worker PWA), and styled-components with full static export and multilingual support across Korean, English, Japanese, and Traditional Chinese.

Building Products.
Architecting Systems.

ABILITY: Gravity & Time

Asharyu Design System

SeedVault

ABILITY: DaoXin

MemoFlow

ISA Archive – Personal Resume Archive

Building Products.Architecting Systems.