Side Project
10AI Voice Agent — Twilio × OpenAI Realtime SIP Bridge
Bridges inbound phone calls to the OpenAI Realtime API via Twilio SIP
PersonalNode.jsOpenAI
Hi, I am Hyun (H)
I am a full-stack engineer based in Oregon with 5 years of experience building high-fidelity interactive systems and reliable backend infrastructure. Previously at Upswell Studio, I developed production-grade platforms and interactive hardware installations for institutions including the Library of Congress, a NASA-funded education platform, the Toledo Museum of Art, and Nokia Bell Labs. My work spans the entire stack, from designing real-time 3D artifact viewers using Three.js and WebGL to engineering fault-tolerant pipelines for large media files and migrating search infrastructure from Elasticsearch to PostgreSQL to reduce costs. I also have experience modernizing legacy C++ codebases and optimizing CI/CD deployment cycles. Ultimately, I focus on turning demanding design concepts into performant software, treating reliability and performance as foundational features.
Recent Projects
A few selected projects that define my current focus and capabilities.
Suvoda
5Suvoda & Greenphire Corporate Merger Timeline
Developed an interactive timeline module within HubSpot CMS to visualize a corporate merger.
UpswellWebJavascriptHTMLCSS
Side Project
6Context-Aware AI Support Agent
A proof-of-concept support agent that remembers users across sessions using Qdrant vector database, OpenAI, andStreamlit.
PersonalWebPythonOpenAIDocker
Gulf of Maine Research Institute
90Learning Ecosystems Northeast Website
PostgreSQL Full-Text Search Engine for NASA-Funded Climate Education Platform
UpswellWebJavascriptVue.jsTailwindCSSPythonDjangoWagtailAWS ECS
Experience
I've been working as a software engineer for the past 5 years. Here's a timeline of my journey.
Jan 2022 -
June 2025
Jan 2022 - June 2025
Software Engineer
- Search Architecture Optimization: Replaced an over-engineered Elasticsearch cluster with PostgreSQL Full-Text Search (GIN Indexing). Simplified infrastructure complexity while maintaining <60ms query latency for a 2,000+ item faceted search system.
- Fault-Tolerant Data Pipeline: Engineered a resilient upload system for 30GB+ video files over unstable networks. Wrapped AWS CLI in a Python subprocess with a custom Finite State Machine for retries, reducing failure rates from 40% to <2%.
- Distributed Hardware Synchronization: Designed a UDP multicast protocol in Node.js to synchronize 4K video playback across 6 independent networked devices with <100ms latency, eliminating the need for cloud-based coordination.
- Legacy System Modernization: Led the migration of a 191,000-line C++ codebase (Qt 5 to Qt 6) and parallelized the Jenkins build pipeline, reducing deployment time by 78% (90m → 20m).
- Performance Engineering: Optimized an interactive museum application to run at 60 FPS on hardware-constrained BrightSign players by implementing custom asset caching and removing expensive CSS filters from the render loop.
Aug 2021 -
Nov 2021
Aug 2021 - Nov 2021
Software Engineer Intern
Estack
- SSR Optimization: Improved Time to First Byte (TTFB) for a Next.js application by optimizing Server-Side Rendering configurations.
Jul 2021 -
Oct 2021
Jul 2021 - Oct 2021
Quality Champion (QA)
- Quality Assurance: Conducted cross-platform testing on web, Android, and iOS.
- Internal Tooling: Reverse-engineered internal legacy tools to build a Chrome Extension that automated data entry workflows. Reduced ticket processing time by 95%, leading to tool adoption by the core development team.
Sep 2016 -
Jun 2021
Sep 2016 - Jun 2021
B.S. in Software Engineering Tech
- Earned two Dean's List honors and multiple scholarships.
Primary Tech Stacks
Django
Python Web Framework
AWS
Cloud Computing
Python
Language
TypeScript
JavaScript With Syntax
Javascript
Language
Vue.js
JavaScript Framework
React
JavaScript Library
TailwindCSS
CSS Framework