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William Kim

Aspiring software engineer based in Orange County, working close to the metal: distributed systems, networking, and operating systems. I'm earning an M.S. in Computer Science at Georgia Tech after starting my career in sales and marketing, where I kept drifting toward the technical side of the job.

Selected work

Georgia Tech OMSCS

LangC++

TransportgRPC

CourseCS 6200

StatusAll tests pass

Distributed file system

A client–server file system where multiple clients stay in sync with a central store over gRPC, built against gRPC compiled from source.

Five RPCs for fetch, store, list, stat and delete, with streaming for large files
Write locks so concurrent clients can't clobber each other's changes
CRC32 checksums to skip transferring files the other side already has
Async callbacks that push server-side changes to every connected client
Tracked down a static-initialization segfault and fixed it with an explicit library initializer

C++
gRPC
Protocol Buffers
concurrency

LangC

TransportTCP sockets

CourseCS 6200

StatusAll tests pass

Multithreaded file server

A boss–worker file server and client speaking a custom GetFile protocol, written in C. My first C project, taken from zero to passing every autograder case.

Thread pool with a shared work queue guarded by mutexes and condition variables
pread() for thread-safe concurrent reads of the same file
Handled SIGPIPE and partial sends so a dropped client never takes the server down

C
pthreads
POSIX sockets

Topology6 ASes

RoutingBGP / FRR

CourseCS 6250

StatusVerified live

BGP prefix hijacking

Built a six-autonomous-system network in Mininet running FRRouting, then demonstrated how a rogue AS can hijack traffic by announcing a more attractive route.

Peer-only hijack where a neighboring AS draws traffic away from the legitimate origin
Full-core hijack using eBGP multihop sessions to reach beyond direct neighbors
Confirmed both attacks against live traffic, not just routing tables

Mininet
FRRouting
BGP
Linux networking

LangPython

ControllerPOX

CourseCS 6250

Status86 / 86 tests

SDN firewall

A software-defined firewall that turns a policy file into OpenFlow rules pushed to switches by a POX controller.

24-rule policy covering CIDR ranges, protocols and port-level filtering
Passed both the standard (86/86) and alternate (45/45) test suites

Python
OpenFlow
SDN

LangPython

DataRIPE RIS

CourseCS 6250

StatusAll tasks pass

Internet routing measurements

Analyzed real BGP update and RIB dumps from public route collectors with pybgpstream: prefix growth, AS path lengths, routing churn and short-lived announcements.

Added a shared parse cache so six analyses reuse one pass over the dumps instead of six

Python
pybgpstream
data analysis

About me

Off the clock

I came to software sideways. I graduated from the University of Southern California with a B.S. in Business Administration, then worked in sales at Gigabyte and marketing at Mora. Those jobs kept pulling me toward the technical side: analyzing client data, setting up the office network, building a livestreaming studio, and earning my CompTIA A+ along the way. Eventually I wanted to understand what was happening underneath, so I went back to school for computer science and headed straight for the low-level courses.

I still like the bridge between technical work and the people it serves. I'm happiest when I can take something messy, figure out how it actually works, and make it reliable.

Outside of coursework I love cinema and catching movies in theaters, lift weights, play basketball while rooting for the Lakers, play Apex Legends and Magic: The Gathering badly but enthusiastically, and live with cats who have strong opinions about my keyboard. I also work part-time as a barista while I'm in school.

Will holding his black cat — Me and my cat, the head of quality assurance.

YouTube @kimchiwill My hobby channel, where I film whatever I happen to be into. I shoot, edit in Premiere Pro and design my own thumbnails. 100K+ views · 400+ subscribers · since 2017 Watch on YouTube ↗

Background

Ops → Systems

2025 – 2028M.S. Computer Science
Georgia Tech (OMSCS), expected Dec 2028

2024Marketing Assistant, Mora
Content, partnerships and a livestream studio; set up the office network

2024Inside Sales, Gigabyte
Managed the Newegg account; used client data to lift retention 10%

2023CompTIA A+
Certified IT professional

2018 – 2021B.S. Business Administration
University of Southern California

Languages: C, C++, Python, JavaScript, HTML/CSS
Systems: gRPC, POSIX threads & sockets, Linux
Networking: BGP, FRRouting, Mininet, OpenFlow / POX
Tools: Git, GitHub, React, AWS S3, WSL2, Tailscale
Media: Premiere Pro, Photoshop, Figma