Ivan Clasen

Senior Linux Systems Administrator with 15+ years managing production, multi-tenant infrastructure across cloud and on-premises environments. Deep expertise in HAProxy, Apache, and Nginx load balancing; Oracle Cloud Infrastructure (OCI) and Oracle PCA/ODA virtualization; and Ansible-driven automation at scale. Proven track record leading platform migrations, hardening security posture, and building custom monitoring and tooling in Bash and Python.

Senior Linux Administrator at 2cana Solutions (2022-10 – 2026-08)

• Managed and automated hosted services across large, clustered environments.
• Deployed and maintained multi-node ODA clusters; led migration from mixed virtualization platforms to Oracle PCA.
• Built and administered OCI networking and infrastructure for production workloads.
• Upgraded server fleet from OL7 to OL8.
• Automated new server deployments and configurations.
• Linux environment configuration standards applied as per policy.
• Migrated monitoring from Nagios to Site24x7 and developed custom monitoring scripts for platform-specific technologies.
• Automated configuration management across the environment using Ansible with Oracle Linux Automation Manager (OLAM).
• Built operational tooling in Bash and Python with Git-based version control.
• Managed complex-ingress reverse proxy solutions.
• Lead the Linux engineering team as teamlead.

L2 Broadband Engineer at Three6Five (2022-03 – 2022-11)

• Provided Level 2 technical support and troubleshooting for broadband network infrastructure and customer connectivity issues.
• Deploy and maintain Sandvine equipment and automate maintenance tasks.
• Manage internal server stack.

Senior System Engineer at Smartz Solutions (2020-10 – 2022-02)

• Managed Docker environments and DevOps pipelines using Docker and Jenkins.
• Administered Azure, AWS, and on-site servers, including new server and network device installation and configuration.
• Deployed and supported client instances; provided ongoing product support and troubleshooting.
• Administered firewalls (Firewalld, iptables) and VPNs; managed and identified security risks and compliance gaps.
• Administered web stack (PHP, Nginx, Apache) and MySQL databases.
• Supported project scoping and pre-sales technical consultation.
• Scripted Ansible automation and maintained TIG stack (Telegraf, InfluxDB, Grafana) monitoring, later migrated to PRTG.

Senior Linux System Administrator at Smoke Customer Intelligence (2018-10 – 2020-09)

• Administered PostgreSQL, including recovery and configuration of database cluster environments.
• Configured AWS, KVM and VMware hosts; performed general Linux server administration.
• Deployed and administered client instances and supported an in-house product, including testing and approving new features for release.
• Led cybersecurity investigations and implemented mitigation plans.
• Managed Docker environment.
• Provided VoIP technical support and after-hours standby support for critical system issues.
• Compiled and analyzed weekly operational data for management reporting.

IT Service Delivery Manager at Sonke Computer Services (2017-02 – 2018-10)

• Owned hands-on delivery of the Curro Schools environment contract.
• Oversaw administration of physical and virtual server infrastructure, ensuring uptime and reliability across Linux and Windows environments (Tier 3 support).
• Directed security risk identification, threat mitigation, and firewall/VPN administration across multiple technologies.
• Led IT strategy, technology roadmapping, and project scoping across virtualization, cloud, and container platforms.
• Owned client SLA compliance and delivered monthly service performance reports.
• Designed and implemented business continuity and disaster recovery solutions; ran backup operations and continuity testing.
• Administered Asterisk VoIP (SIP) systems and Microsoft Active Directory/Exchange/DHCP infrastructure.
• Managed departmental operations, workflows, and the projects team.

Technical Team Lead at Sonke Computer Services (2015-01 – 2017-01)

• Led back-office team on the Neotel (now Liquid Telecoms) contract, reporting to the Service Delivery Manager.
• Recruited, managed, and trained back-office engineers, including career and succession planning.
• Oversaw daily department operations, procedures, and workflows; managed contract SLAs and technical team deliverables.
• Devised IT strategy and technology rollout roadmaps; partnered with project managers and the back-office architect on new solution architecture.
• Designed and implemented business continuity and disaster recovery solutions.
• Coordinated after-hours support staffing and defined team responsibilities for project alignment.
• Maintained the internal Windows and Linux stack.

IT Systems Administrator at Techniche IT (2013-12 – 2015-01)

• Provided advanced support across the Microsoft Server stack (Active Directory, Exchange, DHCP, SCCM, IIS, ISA) and Linux environments (CentOS, RHEL, Ubuntu, Gentoo).
• Supported Windows and Linux servers.
• Managed backup solutions (Veeam, Veritas Backup Exec, Datavault SE) and monitored infrastructure via IBM Foglight, PRTG, and Nagios.
• Documented technologies and procedures used across projects for team reference and training.
• Built, migrated and managed technology across multiple client sites.
• Trained junior staff on systems and procedures.

Systems Administrator at Société Générale (2009-01 – 2013-11)

• Administered core banking UNIX servers, including maintenance and disaster recovery processes.
• Set up and administered servers and services on AWS; deployed and managed virtual environments.
• Managed Microsoft Exchange servers/databases and administered Microsoft SQL Server.
• Managed Active Directory user accounts and provisioning.
• Configured and deployed Cisco and HP networking hardware, including switches, across sites.
• Coordinated backup cycles and continuity testing for Windows and UNIX servers.
• Managed ticketing and SLA adherence.