Senior Unix/Linux Architect & Cloud Automation Leader

Jeonghan Lim Email: ***********@*****.***

Edison, NJ Phone: 1-646-***-****

Senior Unix/Linux Systems Engineer Hybrid Cloud & Automation Architect 20+ years of expertise in architecting, migrating, and securing enterprise-grade Unix/Linux infrastructures. Proven success in leading massive data center-to-cloud migrations (300+ servers), slashing licensing costs through custom- engineered solutions, and automating global compliance (SOC 2). Expert in bridging legacy systems with modern Azure/VMware environments.

Senior Lead Unix/Linux System Engineer The Chemours Company May 2017 – September 2025 (Contracted via Bell Integration / Amelia-IPsoft) Role Overview: Spearheaded the architecture, migration, and stability of a global Unix/Linux infrastructure spanning Azure, VMware, and bare-metal environments. Acted as the primary technical lead for enterprise-scale digital transformation and high-availability operations.

• Cloud Transformation: Orchestrated the end-to-end migration of 300+ enterprise servers from legacy IBM data centers to a hybrid cloud architecture (Azure/VMware) and bare-metal clusters (IBM Power740/AIX & Oracle T5440).

• Cost Optimization & Engineering: Architected an internally engineered messaging broker on Microsoft Azure to replace IBM MQ; designed front-end load balancers, tuned kernel parameters for network optimization, and developed validation scripts—effectively eliminating IBM MQ licensing costs.

• Performance Engineering: Optimized storage architecture and VM configurations for mission-critical workloads, delivering a 20%+ increase in system performance for SAP and DB2 on VMware-Dell Compellent storage environments.

• Automation & AIOps: Modernized global infrastructure administration by implementing Ansible automation and AIOps (proprietary AI tools), reducing manual touchpoints and standardizing deployments across the Unix/Linux on Azure and VMware fleet.

• Security & Compliance: Automated SOC/SOC 2 compliance reporting using Bash, Azure AzCopy, and AppLogic; built and enforced CIS Benchmark tools across all Linux distributions to globalize system hardening.

• Critical Infrastructure & HPC: Executed a zero-downtime remote upgrade of an NVIDIA HPC cluster and ANSYS on Dell VRTX, saving cost from resaler config/delivery charge. Architected ITAR- compliant Production/QA environments supporting WebSphere and Oracle.

• Disaster Recovery: Engineered robust backup solutions for legacy systems using ZFS snapshots via iSCSI to Dell Compellent (NAS), ensuring 100% data protection for the client’s eCommerce application cluster.

• Cross-Functional Leadership: Served as the Tier 4 escalation point on the Critical Incident Response Team, providing tailored solutions for systems, networking, storage, and middleware teams to resolve high-impact outages.

Unix/Linux Systems Engineer – IPsoft (SoundHound AI) November 2015 – April 2017 New York, NY

• L3/4 Multi-Tenant Operations: Delivered Tier 3/4 engineering support for a complex, multi-tenant global environment, maintaining high availability for Tier-1 clients including Avis, McKesson, VNS Health and British Telecom.

• Cloud & Virtualization: Managed the stability of client CloudStack infrastructures; provisioned and orchestrated VM lifecycles via AWS and VMware vCenter.

• High-Availability Engineering: Configured and maintained SAP main servers on SUSE HA Clusters, ensuring 24/7 uptime for mission-critical financial and ERP workloads.

• Middleware Mastery: Optimized and secured diverse middleware stacks, including Nginx, HAProxy, Tomcat, Apache/HTTPD, and WebSphere.

• Data Integrity: Spearheaded large-scale backup and restoration services utilizing Veritas NetBackup and IBM Tivoli (TSM) across distributed data centers. Lead Application Support Engineer – System Sentinel LLC. April 2010 – September 2015 New York, NY

• Financial Sector Support: Provided dedicated DevOps and Market Data support for Nomura Securities and Barclays Capital, ensuring the integrity of high-frequency streaming data.

• Custom Tooling: Engineered bespoke integration solutions using Bash and Perl to optimize data ingestion and real-time processing.

• Knowledge Architecture: Consolidated fragmented product technical notes/documents into a centralized DokuWiki system, ensuring clarity and accessibility to product knowledge; significantly reducing onboarding time for clients and new hires.

• Global Team Leadership: Managed a 24/7 "Follow-the-Sun" support model, overseeing scheduling and operational readiness for a global engineering team. System Analyst / Full-Stack Developer – NY State Office of Technology April 2007 – April 2010

• Legacy Modernization: Led a high-stakes infrastructure overhaul, transitioning 40 SCO-Unix servers and dual Mainframes to a modern Unisys/SUSE Linux/Oracle environment.

• Application Re-engineering: Replaced a legacy .NET lookup tool with a high-performance LAMP stack (Linux, Apache, MySQL, PHP) utilizing AJAX and XML, significantly improving search latency and UI responsiveness.

Unix/Linux Systems Administrator – New York University (2000 – 2007):

• Directed school-wide administration operations for 160+ Unix/Linux systems and managed the greenfield build-out/migration of a departmental Data Center.

• Supervised and trained a team of Level 1 administrators; consolidated Web, Email, and DNS services to a centralized architecture.

Web Programmer / Lead Customer Care – SV Communication Inc. (1998 – 2001):

• Oversaw full-cycle web development using Perl, JavaScript, and HTML, managing client domain infrastructure and hosting.

Technical Profile

Catagory Technology & Skills

Cloud & Virtualization Azure, AWS, VMware (vCenter/ESXi), CloudStack, KVM, IBM Power740, Sun T5440.

Operating Systems and

Compute operation

Enterprise Linux: RHEL (v5 to 9.3), SUSE (11 to 15), Ubuntu (18 to 24). Unix: Solaris 10/11, AIX 7.1/7.2, HP-UX, SCO-Unix. Clustering: SLSE HA clustring, Nvidia HPC clustering (Brightsoft CM). Automation & DevOps Ansible, AIOps, Git, GitHub, Kubernetes, Terraform, Grafana Jenkins, Perl, Nagios, Zabbix, Icinga. Kickstart.

Middleware & Web IBM MQ, Apache HTTPD, Nginx, HAProxy, Tomcat, WebSphere. Data & Storage Oracle DB, MySQL, PostgreSQL, DB2, ZFS, LVM, iSCSI, NFS, NAS, RAID, SMB, CIFS.

Security & Compliance SOC/SOC 2, ITAR, HIPA, ITIL, CIS Benchmarks, LDAP, Kerberos, OpenSSL. Networking TCP/IP, DNS, SNMP, SMTP, Load Balancing (HAProxy/Azure LB). Development Bash, Python, JavaScript, PHP, PowerShell, AJAX, XML, JSON, LAMP Stack. Education/Certification

• City University of New York, Bachelor of Art.

• Certified Redhat System Administrator (re-certified as of January 2026). Language

• Fluent in English and Korean

* References available upon request.

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