Eunsoo Cho — IT Coordinator

Each project below is documented like a real engineering case study: the problem, the process, and the measurable result.

Windows 11 Migration — 200+ Endpoints

OS migration executed in phased waves with zero unplanned downtime.

MigrationIntuneWindows 11

Overview

Planned and executed the migration of 200+ company workstations from Windows 10 to Windows 11 ahead of end-of-support, across multiple departments and office locations.

Problem

Windows 10 end-of-life was approaching, hardware compatibility varied widely across the fleet, and the business could not tolerate downtime during business hours or loss of user data.

My Role

Sole engineer responsible for compatibility auditing, migration planning, imaging, rollout scheduling, and post-migration support.

Tech Used

Windows 11Microsoft IntuneAutopilotActive Directory

Process

Audited hardware against Windows 11 minimum requirements and flagged devices needing replacement. Built a standardized image and Intune deployment profile. Scheduled migration in waves by department to minimize disruption, with rollback checkpoints at each stage.

Solution

Used Intune for policy-driven, semi-automated upgrades where hardware allowed, and manual clean installs with data migration for edge cases. Ran each wave after hours or during low-usage windows, with a same-day support desk for issues.

Result

200+ devices migratedZero unplanned downtimeOn-schedule delivery

Lessons Learned

Phased, department-by-department rollout with clear rollback points reduces business risk far more than a single "big bang" cutover — and pays off even when it takes longer to plan.

IT Network Construction

UPS Replacement, Cable Construcation, Switch/Router Installation, and Server Room Facility Check Up.

IT InfrastructurePowerRack Diagram

Overview

Led a full physical overall of the primary server room: old UPS replacement, new switch and router installation, and a ground-up rack reorganization.

Problem

The existing UPS was end-of-life with degraded battery health, cable runs were undocumented and tangled, and rack space was poorly allocated, making maintenance slow and risky.

My Role

Planned the overhaul, coordinated with vendor and Windows installation , and performed the physical rack, power, and cabling work.

Tech Used

UPS SystemsCisco SwitchesEnterprise RoutersRack & Cable Management

Process

Mapped every existing connection before replacing hardware, sourced a replacement UPS sized for projected 3-year load growth, and staged new switches/routers before a scheduled maintenance window.

Solution

Executed the UPS swap with a temporary bypass to avoid downtime, re-terminated and labeled all cabling to a consistent standard, and re-mounted equipment by function (power, core network, patch panels) for faster future maintenance.

Result

Zero downtime cutover100% cable labelingImproved airflow & access

Lessons Learned

Documenting the "as-is" state before any physical change saves hours later — most server room risk comes from undocumented legacy work, not the new install itself.

Cisco IP Phone Deployment

Replaced legacy analog phone lines with a Cisco IP telephony system org-wide.

NetworkingCiscoVoIP

Overview

Deployed a company-wide Cisco IP phone system to replace an aging analog line setup, covering handset installation, VLAN configuration, and call routing.

Problem

Analog lines were costly to maintain, offered no unified directory or voicemail-to-email, and couldn't scale as headcount grew.

My Role

Handled physical installation, network configuration (voice VLANs, PoE budgeting), and end-user handset provisioning.

Tech Used

Cisco IP PhonesPoE SwitchingVoice VLANQoS

Process

Surveyed desk locations and cabling paths, confirmed PoE budget on core switches, segmented voice traffic onto a dedicated VLAN with QoS prioritization, then rolled out handsets desk-by-desk with a fallback line kept live during transition.

Solution

Configured auto-provisioning so new handsets pulled their config on first boot, drastically cutting per-device setup time, and validated call quality under load before decommissioning analog lines.

Result

Full analog decommissionUnified directory & voicemailLower recurring telco cost

Lessons Learned

Voice traffic needs its own VLAN and QoS treatment from day one — trying to retrofit prioritization after user complaints is much harder than designing it in up front.

Structured Network Cabling Project

Re-cabled office network infrastructure to an organized, labeled, and documented standard.

NetworkingCablingDocumentation

Overview

Ran a full structured cabling project across office floors, replacing ad-hoc cable runs with labeled, patch-panel-terminated infrastructure.

Problem

Years of incremental changes had left cable runs undocumented, unlabeled, and in some cases run through unsafe paths, making troubleshooting slow and risky.

My Role

Surveyed existing cable plant, designed the new patch panel and labeling scheme, and executed re-termination floor by floor.

Tech Used

Cat6 CablingPatch PanelsCable TestersLabeling Standards

Process

Traced and tested every existing run, retired dead cabling, and re-ran new Cat6 where paths were unsafe or undocumented. Built a consistent labeling convention tied to a patch panel map.

Solution

Terminated all runs to a numbered patch panel scheme matching a floor plan document, tested every port for certification, and handed off a full cabling map for future technicians.

Result

100% ports tested & labeledOn-time, no reworkFull documentation handoff

Lessons Learned

A cabling project's real deliverable isn't the cable — it's the map. Documentation is what turns a one-time cleanup into a maintainable system.

ESET End Point Security & Policy Management

Managed USB usage for security. Blocked storage by policy and allowed for user who has permissioin.

CloudESETEndpoint Mgmt

Overview

Enrolled the entire endpoint fleet into Microsoft Intune and rolled out compliance, configuration, and security baseline policies.

Problem

Devices were managed inconsistently with no central policy enforcement, making patching, compliance reporting, and remote wipe/lock capability impossible.

My Role

Designed the enrollment strategy, built compliance and configuration profiles, and managed the rollout communication to end users.

Tech Used

Microsoft IntuneAzure ADAutopilotConditional Access

Process

Piloted enrollment with a small group to validate policies without disrupting daily work, then expanded in waves. Built baseline configuration, update ring, and compliance policies aligned to company security requirements.

Solution

Used Autopilot for new device provisioning and phased enrollment prompts for existing devices, paired with clear end-user instructions and a support channel for enrollment issues.

Result

Full fleet enrolledCentral compliance visibilityRemote wipe/lock enabled

Lessons Learned

A pilot group isn't optional — it's the fastest way to catch a policy that looks fine on paper but breaks a real workflow.

SQL-Based SMS Monitoring System (Telnyx)

Built monitoring and alerting around a SQL-backed Telnyx SMS notification pipeline.

DatabaseSQLMonitoring

Overview

Supported and monitored a business-critical SMS notification system built on Telnyx, with delivery status tracked in a SQL database.

Problem

Failed or delayed message deliveries were only discovered when a customer complained, with no proactive visibility into system health.

My Role

Built SQL queries and scheduled checks to monitor delivery status and flag failures, and coordinated with the vendor on delivery issues.

Tech Used

SQL ServerTelnyx APIScheduled JobsAlerting

Process

Reviewed the message log schema to identify failure and delay patterns, then wrote monitoring queries to catch anomalies (spikes in failure rate, stuck message states) on a recurring schedule.

Solution

Set up scheduled SQL jobs that surfaced delivery failures automatically, with a simple alert path to the team instead of relying on customer-reported issues.

Result

Proactive failure detectionFaster vendor escalationReduced customer-reported issues

Lessons Learned

Even a simple scheduled SQL check beats no monitoring at all — you don't need a full observability stack to stop flying blind on a critical integration.

Palo Alto Firewall Deployment Support

Supported the rollout of a Palo Alto next-gen firewall to replace legacy perimeter security.

SecurityPalo AltoNetworking

Overview

Assisted in deploying a Palo Alto next-generation firewall to replace legacy perimeter hardware, supporting rule migration and cutover.

Problem

The existing perimeter firewall lacked modern threat visibility and was approaching end-of-life, while any misconfigured cutover risked cutting off site connectivity.

My Role

Supported the lead security engineer with rack installation, cabling, staged rule migration, and cutover-day monitoring.

Tech Used

Palo Alto NGFWSecurity ZonesNAT/RoutingTraffic Logs

Process

Mapped existing firewall rules and NAT policies, rebuilt them on the Palo Alto platform in a staging config, and validated against a rule-by-rule checklist before the live cutover window.

Solution

Performed the cutover during a low-traffic maintenance window with the legacy device on standby, then monitored traffic logs closely post-cutover to catch any missed rule before it caused user impact.

Result

Clean cutover, no outageImproved threat visibilityZero missed critical rules

Lessons Learned

Keeping the legacy device live on standby during cutover turns a high-stress migration into a reversible, low-risk one.

IT Asset & Inventory Management

Built and maintained a company-wide IT asset tracking process from the ground up.

Asset MgmtVendor MgmtProcess

Overview

Built a company-wide IT asset and inventory tracking process covering procurement through retirement of hardware.

Problem

There was no reliable record of who had which device, warranty status, or purchase history, making budgeting, audits, and offboarding needlessly slow.

My Role

Designed the asset tracking process and tagging system, performed a full physical inventory audit, and liaised with hardware vendors on procurement and RMA.

Tech Used

Asset TaggingInventory Spreadsheets/DBVendor Coordination

Process

Physically audited every device on-site, assigned asset tags, and logged model, serial, owner, and warranty data into a central tracking system, then defined a standard intake process for new hardware.

Solution

Paired the tracking system with a vendor management routine — regular warranty checks and consolidated purchasing — so aging or unsupported hardware gets flagged before it fails.

Result

Full inventory visibilityFaster offboardingProactive warranty tracking

Lessons Learned

Asset management only sticks if intake is enforced from day one — retrofitting tracking onto an existing untracked fleet is far more work than starting the habit early.

Background

This research aimed to solve the difficulty consumers face in determining avocado ripeness in supermarkets by developing an image-based classification model, replacing traditional assessments based on the tactile experience of skilled workers.

Methodology

Built a CNN-based model and trained it on around 2,600 avocado images that I captured myself, enabling that I trained model to learn color, texture, and shape features. All images were captured using a standard iPhone camera under controlled white-light.

Key Results

Data set for train & test Hyperparameter Optimization Performance Comparison by Backbone

Tech Stack

Python TensorFlow YOLO Backbone Data Set

About me

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Research & Published Papers

CNN-Based Avocado Ripeness Classification System

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Tech Stack

OCR-Based Expiration Date Recognition System

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