FULL-STACK DEVELOPER PORTFOLIO

From web to cloud, a full-stack developer building products

I design and develop web, mobile, and desktop services, backend systems, and cloud infrastructure. I currently operate five services.

View My Services View Resume

Services operated

Web · App · Desktop

Build scope

17+ years

Development career

ABOUT

Working across the product stack

I develop across web, mobile, desktop, backend, and cloud, and currently operate five services.

Services

I develop and operate Smart Coin, Smart Gongsi, xlLens, AnyDisplay, and BebeNote.

Development Areas

Frontend, backend, mobile, desktop, AI, servers, and cloud infrastructure.

Operations

After launch, I handle deployment, monitoring, updates, and user support.

Products we build and operate

Services I Built

From everyday friction to complex workflows, we turn clear problems into focused products used in the real world.

Crypto

Smart Coin

One clear view of the crypto market

A crypto market intelligence app for exploring real-time prices, market signals, Data Lab, derivatives, and the TRON network across 11 exchanges.

Real-time prices and market movement across 11 exchanges

Signals for surges, volume, and the kimchi premium

Data Lab, derivatives, and on-chain intelligence together

11 Exchanges

Real-time WebSocket

iOS · Android

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Fintech

Smart Gongsi

Find the change that matters in every disclosure

An investment intelligence app combining DART disclosure search, personalized alerts, brokerage reports, and AI-powered analysis.

Search DART filings and follow the companies you care about

AI analysis that turns dense disclosures into clear takeaways

Brokerage reports and company intelligence in one place

DART

AI Analysis

iOS · Android

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Productivity

xlLens

See every spreadsheet change with confidence

A desktop app that compares two Excel or CSV files, identifies changes in values, formulas, formatting, structure, and VBA, and exports reports.

Compare values, formulas, formatting, structure, and VBA

Basic, Smart, and Table modes for different workflows

Local processing keeps sensitive workbooks off remote servers

Excel · CSV

Local Processing

Windows · macOS

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Utility

AnyDisplay

Turn the tablet you own into a second display

Cross-platform screen streaming app that extends your desktop to a tablet. Built with Electron, Swift, Kotlin & WebRTC.

Extend Windows and Mac desktops to iPad or Android

Low-latency streaming for focused work and creative tasks

Touch, pen, wired, and wireless workflows supported

Low Latency

Touch & Pen

Windows · macOS

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Parenting

Bebenote

Turn fleeting baby moments into a shared family story

Parenting log and AI growth analysis platform. Mobile App implementation using React Native and Supabase.

Quickly log feeding, sleep, diapers, and growth

Coordinate care with your family in real time

AI insights reveal meaningful patterns in everyday records

Family Sharing

AI Insight

iOS · Android

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Services

Backend Engineering

High-performance async server development (Spring Webflux, NestJS), MSA, gRPC, RSocket, Kafka/RabbitMQ based architecture

WHY IT MATTERS

"Services.backend.why"

CORE COMPETENCY

Services.backend.what

Services.devops.title

Services.devops.desc

WHY IT MATTERS

"Services.devops.why"

CORE COMPETENCY

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Services.blockchain.title

Services.blockchain.desc

WHY IT MATTERS

"Services.blockchain.why"

CORE COMPETENCY

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Cross-Platform App

Cross-platform app development (iOS/Android) using Flutter (Riverpod/GetX) and React Native, Technical Leadership

WHY IT MATTERS

"Services.mobile.why"

CORE COMPETENCY

Services.mobile.what

AI Integration

LLM-based service integration, AI body diagnosis (FIET) and Pilates solution development experience

WHY IT MATTERS

"Services.ai.why"

CORE COMPETENCY

Services.ai.what