EFFEFF Co., Ltd · Software Studio
Every problem is solvable — it just takes will and time.
We move that possibility forward with efficiency and prove it with results.
We find the market's real problems, ideate boldly and freely,
validate coldly and rigorously — and build things that genuinely get used.
CEO / Founder
Han Gyeol Ryu
유한결
Leadership / CEO
Through an engineering career rooted in Silicon Valley, I've experienced firsthand that technology is the most powerful means of solving the essential problems of a business. To me, development goes beyond simply shipping features — it's a process of strategic engineering design that crafts business logic precisely and proves it in numbers.
I favor data-driven agile execution over vague hypotheses. I rapidly turn ideas into reality to precisely target the market's pain points, and I maximize the probability of business success by refining the product with real feedback as fuel. As CEO of EFFEFF Corp, I'm simultaneously building solutions that fill the market's gaps across security, location-based services, commerce, and more — continuing real, hands-on market validation.
We don't just talk about possibilities. By building efficient systems, we prove the real-world effect on the business and show — through results — how technology contributes to the world.
Han Gyeol Ryu, CEO of EFFEFF
Apps I contribute to
Cool as a Cucumber Inc
A taste-archive app — discover who you are with a taste test, then collect what you want through editor picks and wishlists. Co-founded and serving as CTO, leading app planning, technical architecture, and service launch.
Algoboni
An easy, fast way for small business owners to build a loyal customer base — now including 'Chambang Biz', an owner-facing app for regulars, perks, and marketing messages. Contributed as a builder, handling product design and development.
EFFEFF Co., Ltd
An AI-powered, safe friend-matching community for people 45+. AI message-safety checks, a vibe-type test, patent-pending security technology, and accessibility-first design — built, developed, and operated in-house.
EFFEFF Co., Ltd
A location-based restroom information app — Naver Maps search, an emergency nearest-restroom finder with sharing, crowdsourced facility verification, and Korean/Japanese/Chinese support. Designed, developed, and deployed in-house.
Our Product · Core Identity
"Meet friends who fit your vibe, slowly — a reassuring afternoon teatime."
01. The Problem & Vision
Connection after the empty nest: The void left after the kids move on, and the risks of voice phishing, romance scams, and investment fraud. We design for 'reassurance' rather than loneliness, and for 'friends who fit your vibe' rather than dating.
Slowly, safely: AI recommends peers nearby based on shared interests every day, while patent-pending security technology blocks risks. We add real friends to your second chapter, starting at 45+.
02. Key Pillars
Application No. 10-2026-0024079
TITA App
Vibe-matched friends, 45 and up
Cognitive Fingerprint · Layered AI Security
Cognitive Fingerprint and an L1·L2 AI engine detect and block voice phishing, scams, and context-based fraud in real time.
Our Product · Core Identity
"From place search to reviews, we build restroom information together."
01. The Problem & Vision
An information gap: It's hard to find a clean, accessible restroom while you're out. Public data is outdated, and on-the-ground information is inaccurate or scattered.
Trust we build together: Users register, review, and verify directly, while AI filtering and a report/reward structure protect data quality — creating a restroom network on the map that anyone can use with confidence.
02. Key Pillars
My Restroom App
Restroom info on the map, filled in together
AI Filtering · Report · Reward Loop
Filters out inappropriate or duplicate information, and builds trust for contributors and users alike through reports and rewards.
Intellectual Property
We put user safety first with our own patent-pending security technology. Through a financial-grade security architecture and an AI-based real-time threat detection system, we protect you from scams and phishing.
Senior-Specific Social Platform System
시니어 사용자를 위한 온라인 소셜 플랫폼에서 사용자 상호작용의 보안성 및 신뢰성을 향상시키기 위한 통합 시스템. 사용자 식별, 콘텐츠 노출 제어, AI 기반 이상행위 탐지, 하이브리드 매칭 기술을 통합 제공합니다.
February 6, 2026
Filed
AI-Based Connection Recommendation
Real-Time Scam Detection & Blocking
Automatic Accessibility Optimization
Specialized Social Platform System
Contact
Feel free to reach out about project consulting, collaboration proposals, or technical inquiries.