Phoenix, AZ·Open to opportunities

Hakyung Yun

Software · Embedded · Design Verification
Building systems where there were none.

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01 — Manifesto · head → null

I find the way.I build what isn't there.

Currently in Phoenix, Arizona as a Computer Engineer working ESS System QA at an outsourced LG Energy Solution site — no in-house tooling. Instead of waiting, I shipped six internal platforms my coworkers now use every day.

Software Engineering

Full-stack platforms used in production by real teams.

Embedded Software

C / RISC-V / SystemVerilog. From kernel paging to FPGAs.

Design Verification

Built an RV32IM out-of-order processor — fell for DV along the way.

02 — Experience · linkedList.traverse()

A track record of
building beyond the role.

head →node[0]
Jan 2026 — Present
ESS System QA Engineer
·LG Energy SolutionCurrent
Phoenix, AZ · On-site at partner facility
Owning quality for ESS systems while building the digital infrastructure the partner site never had.
- Identified gaps in traceability, defect tracking, and shipping review workflows — then shipped 6 internal web platforms now used daily by the System QA team.
- Replaced spreadsheet-driven QA processes with real-time dashboards, barcode-driven assembly tracing, and policy-aware shipping approvals.
- Translated bilingual technical communication, defect taxonomies, and procedures into a centralized internal wiki adopted across shifts.
- Bridged Computer Engineering and Quality: turning every recurring manual task into a measured, auditable, automated system.
Next.jsSupabaseTypeScriptTailwindExcelJS
node[1]
May 2025 — Aug 2025
Software Engineer Intern
·Glim
Seoul
Built MFC tooling for subpixel edge-detection QA on factory-bound inspection systems.
- Developed MFC UI to surface tolerance data from subpixel edge-detection — cut QA review time 25%.
- Shipped annotated defect image export, eliminating CSV cross-referencing and reducing validation time 50%.
- Ran 50+ pre-deployment simulations achieving a 95% pass rate before factory rollout.
C++MFCImage Processing
node[2]
Jan 2025 — May 2025
Software Developer
·Illinois Business Consulting
Champaign, IL
Modernized the consultancy's internal recruitment and survey infrastructure.
- Migrated the legacy survey system from vanilla JS to SurveyJS, dramatically improving UX.
- Automated end-to-end recruitment workflows, removing manual coordination overhead.
- Collaborated with 8 engineers refactoring frontend and backend for long-term maintainability.
JavaScriptSurveyJSNode.js
node[3]
Oct 2022 — Apr 2024
Sergeant · Squad Leader
·Republic of Korea Army
12th Infantry Division
Squad leader for 8 months. Led training, operations, and people under pressure.
- Responsible for the welfare, readiness, and discipline of an 8-soldier squad.
- Operational leadership during field exercises and live deployments.
LeadershipOperations
node[4]
May 2022 — Aug 2022
Software Engineer Intern
·Synchrony
Champaign, IL
Built cloud analytics tooling and automation for the PCF Cloud Engineering team.
- Designed 5+ Tableau dashboards delivering real-time PCF analytics to the Cloud Team.
- Automated Python sync of PCF product versions with MySQL — cut manual overhead 80%.
- Partnered with Cloud Engineering VPs to design a scalable PCF API for audit automation.
PythonTableauMySQLPCF
node[5]→ null
Jan 2022 — May 2022
Software Developer
·Disruption Lab at Gies
Champaign, IL
Built a research-opportunity discovery platform for university students.
- Added interactive features (comment box, redesigned landing) to lift engagement.
- Shipped a fully mobile-responsive Tailwind redesign across the product.
- Worked with a 5-engineer team on React + AWS Lambda + DynamoDB.
ReactTailwindAWS LambdaDynamoDB

03 — Selected Work · sort(impact, desc)

Built at LG Energy Solution.
Used every day.

Six internal platforms I built solo for my System QA team — covering traceability, defect analytics, shipping approvals, calculators, the team wiki, and real-time translation.

arr.sort(sort:

)

sorted·O(1)

Live Traceability Internal

arr[0]

Assembly Tracker

Search and trace assembly history by any part ID — Link, Pack, BPU, Rack, RBMS, or Enclosure. Filter by date and customer site.

— Cut traceability lookup time from minutes of spreadsheet hunting to a single barcode scan.

Next.jsSupabasezxing-wasmExcelJSTailwind

Live Analytics Internal

arr[1]

Defect Monitoring System

Monitor and track defects in real-time. Analyze trends and assign daily tasks for quality improvement.

— Turned static defect logs into a live dashboard that drives daily standups.

Next.jsSupabaseRechartsXLSX

Workflow Automation Internal

arr[2]

Shipping Request Reviewer

Review and approve outgoing shipment requests. Verify quality status, hold flags, and customer requirements.

— Codified shipping approval rules into a single source of truth — fewer hold-leaks, faster sign-off.

Next.jsSupabasepdf-parseExcelJS

Live Analysis Internal

arr[3]

mV/day Calculator

Calculate voltage drop rates per day for cell and pack measurements. Spec compliance and trend analysis.

— Replaced a fragile Excel template with a server-validated calculator the whole team trusts.

Next.jsSupabaseExcelJS

Knowledge Base Internal

arr[4]

System QA Wiki

Access and contribute to the system quality assurance documentation. Share best practices and update procedures.

— Centralized scattered tribal knowledge into a searchable, version-controlled internal wiki.

Next.jsSupabaseMarkdown

Utility

arr[5]

Live Translator

Translate in real-time between English and Korean. Built for fast bilingual communication on the floor.

— Closes the language gap between Korean QA staff and English-speaking partners in real-time.

Next.jsSupabaseStreaming APIs

04 — Personal Projects · stack.push()

From web platforms to silicon.

arr.sort(sort:

)

sorted·O(n log n)

Design Verification

arr[0]

Out-of-Order Processor

RV32IM out-of-order microprocessor in SystemVerilog with split I/D caches, MUL/DIV, and explicit register renaming.

— The project that hooked me on Design Verification — RVFI + Spike co-simulation, lint-clean synthesis, benchmark-driven tuning.

SystemVerilogRV32IMRVFISpikeVerilatorSynopsys DC

AI Assistant

arr[1]

Memo.dev

Context-aware AI memory assistant with semantic search, memory graphs, and multi-turn GPT-4o chat.

— End-to-end product: vector search, auth, file ingestion, tagging, weekly digests.

Next.jsFastAPIPineconePostgresGPT-4o

Social Platform

arr[2]

Flinch

Anonymous confession platform with real-time data, full-text search, and privacy-first design.

— Designed moderation and safety primitives that keep an anonymous community respectful.

Next.jsSupabasePostgres

Systems

arr[3]

Unix-like OS

Unix-like operating system supporting user programs, virtual memory, and syscalls. C + RISC-V + Sv39 paging.

— Implemented multi-level page tables, demand paging, process abstraction, and an ELF loader.

CRISC-VSv39

Hardware

arr[4]

Snake on FPGA

Classic Snake game implemented in SystemVerilog hardware with C game logic running on an FPGA.

— Hardware/software co-design: HDL display + input + collision pipeline with C logic layer.

SystemVerilogCFPGA

05 — Stack · hashMap<skill>

Languages of choice.

TypeScript·JavaScript·Python·C·C++·SystemVerilog·RISC-V·SQL·React·Next.js·Tailwind CSS·Framer Motion·Three.js·Node.js·FastAPI·Supabase·Postgres·Pinecone·MySQL·DynamoDB·Vercel·AWS Lambda·Git·ExcelJS·Verilator·Spike·QA Automation·Traceability·Defect Analytics·Design Verification·MFC·TypeScript·JavaScript·Python·C·C++·SystemVerilog·RISC-V·SQL·React·Next.js·Tailwind CSS·Framer Motion·Three.js·Node.js·FastAPI·Supabase·Postgres·Pinecone·MySQL·DynamoDB·Vercel·AWS Lambda·Git·ExcelJS·Verilator·Spike·QA Automation·Traceability·Defect Analytics·Design Verification·MFC·

Languages

TypeScript
JavaScript
Python
C
C++
SystemVerilog
RISC-V
SQL

Frontend

React
Next.js
Tailwind CSS
Framer Motion
Three.js

Backend & Data

Node.js
FastAPI
Supabase
Postgres
Pinecone
MySQL
DynamoDB

Platform & Tooling

Vercel
AWS Lambda
Git
ExcelJS
Verilator
Spike

Quality & Systems

QA Automation
Traceability
Defect Analytics
Design Verification
MFC

Education

University of Illinois Urbana-Champaign

B.S. Computer Engineering

Aug 2020 — Dec 2025

06 — Let's talk · return reply

Open to
new opportunities.

Software engineering, embedded software, design verification, or anything where I can keep building systems that move teams forward.

hamiram9@gmail.com Resume

GitHub LinkedIn

Hakyung Yun

I find the way.I build what isn't there.

Software Engineering

Embedded Software

Design Verification

A track record of building beyond the role.

ESS System QA Engineer

Software Engineer Intern

Software Developer

Sergeant · Squad Leader

Software Engineer Intern

Software Developer

Built at LG Energy Solution.Used every day.

Assembly Tracker

Defect Monitoring System

Shipping Request Reviewer

mV/day Calculator

System QA Wiki

Live Translator

From web platforms to silicon.

Out-of-Order Processor

Memo.dev

Flinch

Unix-like OS

Snake on FPGA

Languages of choice.

Open to new opportunities.

A track record of
building beyond the role.

Built at LG Energy Solution.
Used every day.

Open to
new opportunities.