busan sashimi
aka Brian (English) • Haruki (Japanese) • Sashimi (Internet)
full-stack developer & problem solver
building elegant solutions with precision and creativity
(about)
Hi, my name is Lee Sung Hak, from Busan, South Korea. My English-speaking friends call me Brian, and my Japanese friends call me Haruki. In the developer community, you might know me as Sashimi. I'm a full-stack developer with over 7 years of experience crafting elegant web applications.
My journey into development started unexpectedly. In university, I was captivated by creative tools like Adobe Premiere, Final Cut, Logic, and Ableton Live. These tools made content creation intuitive and empowered creativity. But I became more fascinated by how these tools were made than how to use them. This curiosity led me to web frontend development—a field that's constantly evolving with new technologies and endless opportunities to create.
I've worked across diverse environments—from conservative development teams to international R&D labs, from agile startups to enterprise platforms. My strength isn't just in React or Vue.js, but in solving problems wherever they emerge: whether that's frontend architecture, data pipeline optimization, internationalization, or building CI/CD systems. I believe great developers are utility players who enhance team productivity across domains.
Inspired by the precision of Korean craftsmanship and the clean simplicity of sashimi preparation, I approach development with meticulous attention to detail. Every line of code is an opportunity to create something both beautiful and functional.
(philosophy)
precision
Like preparing sashimi, every cut in code must be precise. Clean, intentional, and purposeful. Quality over quantity, always.
problem solving
The best developers aren't defined by their tech stack, but by their ability to solve problems. From frontend to backend, data to infrastructure—I go where the problem leads.
team first
Software is a team sport. Great code means nothing without great communication, collaboration, and mutual respect. I've worked across cultures and languages because good teams transcend barriers.
continuous evolution
Technology never stands still, and neither should we. Stay curious, embrace new ideas, and always be learning. Today's innovation is tomorrow's foundation.
(expertise)
technologies
frontend
backend
infrastructure
systems
languages
focus areas
- • Full-stack web application development
- • Performance optimization & system architecture
- • Design systems & developer experience
- • Internationalization & localization
- • Real-time media processing
- • Team collaboration & knowledge sharing
(journey)
2025 - present
Full-Stack Developer • Certified Tax Accountant Platform • Seoul, South Korea
Building enterprise tax management platforms with modern web technologies. Leading frontend architecture decisions and cross-team collaboration.
2020 - 2024
Web Frontend Engineer • Atlas Labs • Seoul, South Korea
Developed web platforms for STT (speech-to-text) applications and AI-powered B2B services. Led design system adoption initiatives and performance optimization projects.
- • Built React-based audio/text editor with advanced performance optimization
- • Created B2B prompt engineering back-office using Vue.js & Tailwind CSS
- • Led STT engine Japanese localization (data collection & validation)
- • Organized design system seminars (Storybook + Chromatic + Atomic Design)
- • Worked in international R&D team with multilingual communication
2019 - 2020
Web Frontend Developer • Itam Games • Seoul, South Korea
Developed admin portal for game company management, handling game registration, management, and platform operations.
2019
The Beginning • Career Start
Transitioned from creative tools enthusiast to professional web developer. Started my journey in frontend development, discovering a passion for building elegant, functional experiences.
(projects)
3D Coding ASMR Recorder
in-progressNative desktop application for screen and audio recording with real-time H.264 encoding. Solved complex performance challenges with pixel buffer pool management and BGRA fast-path optimization.
- • Built with Rust + Tauri for native macOS performance
- • Custom FFmpeg pipeline for real-time encoding
- • Extensive performance optimization documented in dev logs
Mobile Wedding Invitation
completedFull-stack wedding invitation platform as a gift to a friend. Complete with guestbook, RSVP system via Google Spreadsheets API, and production CI/CD pipeline.
- • Full AWS infrastructure: EC2, CloudFront, Route 53, CodePipeline
- • Simple backend with Google Spreadsheets API
- • Real production service for actual wedding
STT Text Editor for Transcriptionists
completedProfessional-grade text editor synchronized with audio playback. Rebuilt from scratch using contenteditable to solve critical performance issues.
- • Removed heavyweight WYSIWYG libraries for custom implementation
- • Audio-text synchronization with custom shortcuts
- • Dramatic performance improvement enabling real-time editing
Coupang B2B Prompt Engineering Platform
completedInternal back-office for data labeling and prompt testing. Designed complete UI/UX without a designer, implementing iterative feedback cycles.
- • Full UI/UX ownership with stakeholder feedback cycles
- • Led internal Tailwind CSS adoption seminar
- • STT + ChatGPT integration for customer inquiry categorization
(interests)
systems programming
Deep dives into Rust, memory manipulation, FFmpeg, and low-level optimizations. Currently exploring real-time video processing.
audio & music production
Background in Logic, Ableton Live, and creative audio tools. Building ASMR recording tools that blend technical precision with audio craft.
gaming & modding
Football Manager enthusiast exploring game modding, memory manipulation, and real-time data visualization.
continuous learning
Always exploring: design systems, developer experience, new frameworks, and emerging technologies. Sharing knowledge through seminars and documentation.
coffee culture
Korean coffee culture and brewing the perfect morning fuel. Coffee-driven development at its finest.
creative coding
Computer vision projects, developer tools, macOS utilities. Building things that blend creativity with functionality.
(connect)
“The best code is like the finest sashimi — fresh, clean, and cut with precision.”
— development philosophy