Cybersecurity & Network Engineering

Hyuntae Yoo (Hunter Yoo)

Segmented. Hardened. Documented.

Purdue University, graduating December 2026 Open to full-time network and systems roles

  • 3 K3s nodes on Oracle Cloud
  • 4 segmented VLANs at home
  • 1 admin path, over Tailscale
Visitors reach the cloud through one ingress. Players reach home only through a tunnel. Admin access takes its own private path. Public traffic Tunnel Admin only Case study

Selected work.

Five systems I designed, built, and run.

1 · Network design Operational

No public IP. Still public.

A public game server, run from home. Players come in through a tunnel; admin access stays on a private path.

Key decision — public traffic and admin access never share a path.

DMZ VLAN · playit · Tailscale · ESXi Case study ›

2 · Wireless & VLANs Live

One network. Four zones.

A UniFi home network split into trusted, IoT, guest, and DMZ segments, with WPA3 where devices support it.

Key decision — nothing crosses between zones unless a rule allows it.

Cloud Gateway Max · U7 Pro Max · VLANs Case study ›

3 · Cloud infrastructure Live

Three nodes. One platform.

K3s on Oracle Cloud's Always Free ARM instances, behind Ingress-NGINX with automatic TLS.

Key decision — every public service gets a clean ingress and certificate, never an ad-hoc port.

OCI · K3s · Ingress-NGINX · cert-manager Case study ›

4 · Documentation Live

Everything, written down.

A self-hosted BookStack wiki that runs on the same cluster it documents.

Key decision — guests can read, edits need sign-in, and the data is backed up.

BookStack · K3s · cert-manager · backups Case study ›

5 · Security training Live

Incident response, on demand.

IRLab sends a realistic alert, takes your response plan, and scores it.

Key decision — no LLM in the score, so every point is explainable.

  • 70 scenarios
  • 4 tracks
  • 4 difficulty levels
All case studies ›

Experience.

  1. Network Engineering Aide · Purdue University

    Provisioned Cisco switches and routers, traced and repaired campus fiber, and reconciled access-point records for ISO audit preparation.

    Jan 2025 – Sep 2026

  2. Public Cloud Security Intern · LG Uplus

    Designed an AWS Zero Trust architecture and multi-account access governance for a multi-cloud environment. Selected as an outstanding intern.

    Jul 2026 · Seoul

  3. Teaching Assistant · Purdue Polytechnic

    Guided students through Windows System Administration projects, graded assignments with detailed feedback, and resolved lab environment issues.

    Aug 2024 – May 2025

  4. Datacenter Infrastructure Engineer · Purdue Polytechnic

    Built a two-room data center for research and instruction: installed servers, cabling, and power distribution, and configured Cisco and HP network equipment.

    Jul 2024 – Aug 2024

  5. IT Specialist · Republic of Korea Air Force

    Configured and repaired endpoints across internet, intranet, and private networks.

    Nov 2021 – Aug 2023

  6. B.S. Cybersecurity, Network Engineering Technology · Purdue

    GPA 3.68 · West Lafayette, Indiana

    Aug 2020 – Dec 2026

Coursework.

Final semester · Fall 2026

CNIT 45500

Network Security

Packet filtering, VPNs, IPsec, RADIUS, and intrusion detection.

Labs: firewalls · VPNs · vulnerability testing and IDS

CNIT 47000

Incident Response Management

Identify, protect, detect, respond, and recover, with hands-on host forensics.

Labs: identify · protect · detect · respond

CNIT 48101

Cloud Computing Infrastructure

Availability and SLAs, leaf-spine data centers, virtualization, and containers.

Labs: cloud-init · Vagrant · Docker multi-stage builds

CNIT 58100

Advanced Cloud Computing

Kubernetes, Helm, infrastructure as code, and cloud monitoring.

Labs: Docker images · multi-container nginx · shared volumes

  • CNIT 24200
    System Administration
  • CNIT 27000
    Cybersecurity Fundamentals
  • CNIT 27100
    Cybersecurity Fundamentals II
  • CNIT 27200
    Database Fundamentals
  • CNIT 28000
    Systems Analysis and Design Methods
  • CNIT 31500
    Systems Programming
  • CNIT 32300
    Basic Cyberforensics
  • CNIT 34000
    UNIX Administration
  • CNIT 34220
    Network Administration
  • CNIT 34500
    Internetwork Design and Implementation
  • CNIT 34600
    Wireless Networks
  • CNIT 37000
    Introduction to Cryptography
  • CNIT 42200
    Cyber Criminology
  • CNIT 45500
    Network Security
  • CNIT 47000
    Incident Response Management
  • CNIT 47100
    Vulnerability Analysis and Testing
  • CNIT 48000
    Managing Information Technology Projects
  • CNIT 48101
    Cloud Computing Infrastructure
  • CNIT 58100
    Advanced Cloud Computing
  • CNIT 58100
    Applied Generative AI in Mobile Computing

Skills & credentials.

  • Cisco

    CCNA

    Valid through Sep 2029
  • Linux Professional Institute

    LPIC-1

    Valid through Apr 2028
  • Amazon Web Services

    AWS Cloud Practitioner

    Valid through Nov 2028

Networking

  • Cisco
  • Juniper
  • Aruba
  • UniFi
  • VLANs and DMZ
  • IPv4 / IPv6
  • DNS · DHCP · NAT
  • STP · SNMP
  • Wireshark
  • LibreNMS
  • Wireless
  • Fiber

Systems & cloud

  • Linux administration
  • Windows
  • VMware ESXi
  • Oracle Cloud (OCI)
  • Kubernetes (K3s)
  • Docker
  • Vagrant
  • cloud-init
  • Confluence · Jira

Security

  • Zero Trust architecture
  • Network segmentation
  • Firewalls and ACLs
  • pfSense
  • UFW
  • Tailscale
  • TLS · PKI
  • IDS / IPS
  • ISO/IEC 27001

Let’s talk.

Email is the fastest way to reach me.

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