CV

Junsung KIM

Role: DevOps / Site Reliability Engineer Location: Seoul, South Korea Email:

devops.jean@gmail.com⁠

Phone: +82-10-8931-8455 Personal Blog/ Portfolio:

https://coda.io/@devops/allaboutit⁠

GitHub:

https://github.com/devopsjean⁠

LinkedIn:

https://www.linkedin.com/in/devopsjeanmc⁠

⁠

Professional Summary

Junior DevOps/SRE Engineer with practical experience in Linux systems administration, multi-site networking, Bash automation, cloud fundamentals, and real-time incident response. Background spans both large-scale IDC infrastructure and real-time production system operations. Strong troubleshooting skills, deep understanding of distributed systems behavior, and hands-on experience building automation pipelines, Kubernetes environments, and firewall systems. Currently contributing to an open-source cloud-native project targeting CNCF Sandbox submission.

Core Competencies Linux Systems Ubuntu(LTS), Rocky Linux, Debian, system administration, service troubleshooting, package management. Networking DNS, VLAN, routing, VPN, firewalling, packet capture (tcpdump, Wireshark), IPtables. Automation & Scripting Bash, shell-based deployment automation, Git workflows. Cloud Platforms AWS, Google Cloud, Azure – architectural fundamentals, compute/networking/storage administration. Containers & Orchestration Docker, Kubernetes (kubeadm cluster), Helm chart deployment. Monitoring & Observability Prometheus, Grafana, Node Exporter; metric-based troubleshooting. Systems & Security VMware ESXi, SSL/TLS certificate lifecycle management, IPFire (Firewall, URL Filtering, Suricata), CGI/Perl customization.

Professional Experience Systems / Infrastructure Engineer – Securelink Oct 2023–Present | Seoul, South Korea Administer and operate Linux-based servers within production-grade IDC environments. Automate and operate production workflows for backup, packaging, deployment, and logging using Bash, reducing operational errors and migration time by 90%. Conduct root cause analysis (RCA) and troubleshoot incidents across multi-site distributed infrastructure, establishing external traffic monitoring protocols to enhance threat detection and reduce cyberattack risk. Diagnose complex network issues using tcpdump, IPtables, and Wireshark to identify network bottlenecks, reconfigure firewall controls, and audit server-bound traffic patterns. Administer and maintain DNS, VPN, VLAN, static routing, and firewall policies. Design and operate SSL/TLS certificate creation and renewal pipelines for production systems. Enhance and maintain open-source network middleware (UTM) logic through Perl/CGI customization for organizational needs. Live Sound / Real-Time Systems Engineer Jan 2014–Present | Seoul, South Korea Operate real-time production systems requiring zero downtime and immediate troubleshooting. Monitor system signals for latency, overload, and routing faults, and respond to incidents under strict time constraints. Ensure system reliability during live operations by controlling input levels, managing gain staging, monitoring relay display systems, and coordinating in real time with on-site operators and speakers.

Projects RustCost – Open Source Cloud-Native Cost Analysis Project Core DevOps Engineer (Sept 2025–Present) Contribute infrastructure automation and Kubernetes components to a Korean open-source project targeting CNCF Sandbox acceptance. Participate in roadmap discussions, issue tracking, and release planning to ensure the site is executed accurately and efficiently. Publish technical articles on observability, monitoring, root-cause diagnosis, correlation and context analysis to establish developing standards for the production environment. xUTM Deployment Automation Framework (Jan 2024–Present) Build a customized Bash-based deployment pipeline including DB schema extraction, file zeroing, and JSON templating. Add permission restoration logic, ownership consistency modules, and a real-time UI progress bar. Integrate detailed error logging and system validation routines that enable real-time issue detection and resolution while monitoring job history and network application performance. Kubernetes Personal Lab Infrastructure (date) Deployed a multi-node Kubernetes cluster via kubeadm for personal learning and prototyping. Installed and configured Helm charts including Kubecost and RustCost for cost & resource monitoring. Built an observability stack using Prometheus and Grafana for cluster-level insights.

Education & Training University of London – BSc Computer Science (Conditional Offer, Expected 2026) SolDesk Cloud & DevOps Bootcamp (960 hours, Dec 2022 - Jun 2023) IaC-based AWS microservices cloud environment design & deployment Awarded 1st Prize for Bootcamp final project (Team Leader) KGITB Multi-Cloud Engineering Bootcamp (580 hours, May 2022 - Oct 2022) AWS / GCP / Docker / Kubernetes multi-cloud training

Cloud Certifications & Training Introduction to Linux LFS101 (2025) A Beginner’s Guide to Open Source software Development LFD102 (2025) Introduction to Open Source License Compliance Management LFC193 (2025) Implementing Open Source License Compliance Management LFC194 (2025) Kubecost Official training with certificate (2025) Architecting on AWS (40 hours, 2023) Google Compute Engine Architecting (40 hours, 2023) Microsoft Azure Administrator – Official Training (40 hours, 2023)

Hands-on Experience Terraform Day 2 Operations & Automation (IBM, Dec 2025) State and drift management in live infrastructure Plan-based change workflows for safer operations AI-assisted review of Terraform configuration

Languages Korean: Native English: Upper-intermediate (B2)

Interests Cloud-native systems, cost optimization models, and observability, with a focus on understanding underlying system behavior, trade-offs, and failure modes in distributed and real-time environments.

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