Software Engineer

Gyumin Park

Software engineer building real-time, full-stack systems — currently at Epic Systems.

Verona, WI

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Selected Work

Projects

FitLog

Offline-first workout tracker PWA

Full-stack workout logger with Server Actions, optimistic mutations through TanStack Query, NextAuth v5 (credentials + GitHub + Google), Recharts progress visualizations, and a service worker for offline use.

Next.jsTypeScriptPostgreSQLPrismaNextAuthTanStack QueryTailwind

Angel vs Devil

Conway's Angel Problem in the browser

Visual implementation of Conway's Angel Problem on an infinite sparse grid. Hybrid AI (escape vectors, flood-fill freedom scoring, minimax lookahead) runs in a Web Worker. Custom HTML5 Canvas renderer with pan/zoom and a danger heatmap overlay.

Next.jsTypeScriptCanvasWeb WorkerZustandVitest

BidHaus

Real-time draft auction platform

Live multi-user auction rooms with optimistic-locked bids, server-authoritative timers via BullMQ, Redis cache-aside, sliding-window rate limiting, and full reconnection state sync. Built to demonstrate distributed-systems patterns end-to-end.

Next.jsTypeScriptPostgreSQLPrismaSocket.ioRedisBullMQ

Toolkit

Skills

Languages

TypeScriptJavaScriptPythonC#SQL

Frameworks

ReactNext.jsNode.jsExpressASP.NET Core.NETFastAPI

Databases & Infra

PostgreSQLPrismaRedisBullMQDockerSocket.IOREST APIsVitestPlaywright

Track Record

Experience

Software Developer

Epic Systems · Verona, WI

Aug 2024 — Present

Designed and shipped a unified clinician monitoring app inside MyChart Bedside TV in React/TypeScript backed by C#/ASP.NET Core services, cutting per-room hardware cost 50% across 13,000+ clinical rooms.
Integrated a configurable patient-data reporting framework into a React/TypeScript dashboard behind a JWT-based pre-login gating flow, modularizing report controls and reducing customer-specific feature requests by 30%.
Modernized internal C#/ASP.NET Core APIs serving patient vitals, alerts, and status by introducing cache-aside reads and async service calls, cutting P95 latency 25% across core clinician workflows.
Led a cross-functional, backward-compatible migration of a WPF/.NET desktop app to a modern React/TypeScript web architecture, partnering with QA and field engineering to enable phased rollout to 5+ early-adopter health systems.

Software Developer Intern

Epic Systems · Verona, WI

May 2023 — Aug 2023

Built the core React/TypeScript UI for the Patient Room Display integrated with C#/.NET backend services, shipped to 120+ hospital rooms across Emory Healthcare and Infirmary Health.
Delivered four configuration-driven React layouts and real-time UI components surfacing safety alerts, precautions, and live patient status outside each room.

Education

Brown University

Computer Science

Graduated 2024

Let's connect

Have a project in mind?

I'm open to new opportunities and collaborations. The fastest way to reach me is by email.

gyumin_park@alumni.brown.edu GitHub LinkedIn