Profile

25+ years of Linux administration experience across production and enterprise environments. Focused on service stability, automation, security and root cause analysis (RCA). Strong in Linux OS and application debugging, bottleneck analysis (CPU/IO/memory/network) and performance optimization through tuning, configuration fixes and operational improvements. Process-driven: change/release support, maintenance windows, standardization and documentation.

Skills

Linux / System Engineering
Operations, standardization, hardening, performance.
  • Linux (RHEL/SLES/Ubuntu/Debian): operations, standardization, hardening
  • Linux OS debugging: logs, systemd, service behavior and dependency analysis
  • Performance tuning: CPU/IO/memory/network
  • Packaging / provisioning: custom images and custom .deb/.rpm
Application & Platform Debugging
Troubleshooting, regressions, bottlenecks.
  • Application debugging: runtime behavior, logs, regressions
  • Bottleneck analysis: identify & unblock using profiling/metrics/logs
  • Metabase: operations, upgrades, troubleshooting
  • WordPress: performance, diagnostics, stability & maintenance
Infrastructure / Virtualization / Storage
VMware, bare-metal, storage operations.
  • VMware ESXi / NSX, Proxmox VE: clusters, change execution, platform reliability
  • Bare-metal (HPE): OneView, remote hands coordination, operations
  • Hitachi HNAS: operator-level storage operations
  • NFS / Samba: shares, permissions, file services reliability
Networking & VPN
Segmentation, troubleshooting, remote access.
  • VPN: OpenVPN, WireGuard, IPsec
  • Network segmentation / DMZ: segmentation, firewall, policy maintenance
  • UniFi stack: UDM, USW, UAP; VLAN, routing, policy
  • Network troubleshooting: latency, packet loss, network impact on apps
DevOps / Automation / Security / ITSM
CI/CD, automation, vulnerability management.
  • Automation: Puppet, Ansible, Rundeck, Bash; reduce manual work
  • CI/CD & release support: Jenkins, Azure DevOps, Git
  • Kubernetes / GitOps: Argo CD, kubectl, cluster provisioning
  • Security ops: Qualys (VM), patching, vulnerability mitigation
  • ITSM: ServiceNow, ITIL4, change management

Experience

Kyndryl — Senior Team Technical Lead / Senior Linux Administrator
Enterprise environments: operations, automation, security, production support
2021 – present
  • ITSM / ServiceNow: incidents/requests/changes workflow
  • ITIL4 / Change management: planning, risk assessment, maintenance windows, post-check
  • CI/CD & release support: Jenkins and Azure DevOps across dev/non-prod/prod
  • Qualys (Security operations): detections, reporting, mitigation
  • Security patching: preparation, execution, post-change validation
  • Kubernetes / GitOps: Argo CD, kubectl; provisioning and ops support
  • Automation / Orchestration: Rundeck, Bash, Puppet-based automation (800+ VMs)
  • SUSE Manager / Red Hat Satellite: repos, patching, lifecycle management
  • VMware platform: ESXi clusters; NSX + Terraform (basics)
  • Observability: ElasticSearch, Kibana, rsyslog; event analysis
  • 24/7 on-call: incidents, escalations, service continuity
IBM — Advisory IT Specialist
Enterprise operations support and process-driven delivery
2021
  • ITSM / ServiceNow: operational work
  • ITIL4 / Change management: process-driven change support
  • Operations support: enterprise standards, escalations
LinuxAdmin.pl / SysGroup.pl — Administration / DevOps (client services)
Automation, monitoring, hardening, patching, CI/CD support
2018 – 2021
  • Ansible: configuration and deployment automation
  • Nagios: infrastructure and service monitoring
  • Security hardening: baselines, recommendations, standards
  • Patching: planning and execution of maintenance windows
  • CI/CD (apps): CI/CD delivery and operational support
  • App & OS debugging: bottlenecks, optimization, OS/network/app issues
Domena.pl / Agnat Sp. z o.o. — Administrator / Support L1–L3 / On-call
Hosting provider: web, mail, backup, security + customer support, PLD Linux
2004 – 2018
  • End-to-end hosting operations: web, mail, backups, security areas
  • L1/L2/L3 support: diagnosis, escalations, problem solving (30+ bare-metal servers)
  • On-call: incident handling outside business hours
DomainMaker — Administrator (Linux / domains / servers)
vServer, EPP (including NASK), server infrastructure
2008 – 2009
  • Linux virtualization: PLD Linux, Debian; VPS/vServer operations, Proxmox
  • EPP / domains: EPP operations including NASK EPP; integrations
  • Server hardware: Dell PowerEdge, Supermicro; administration and upkeep
Insignia — Administrator (volunteer)
Services for websites and file sharing
2008 – 2012
  • SVN (web): repositories, access, upkeep
  • Samba: file shares and permissions
  • LAMP: customer website environments maintenance
Klubowa.pl — Linux Administrator (volunteer)
(Quasi) HA LAMP stack
2007 – 2020
  • Quasi-HA: high availability approach and service continuity
  • LAMP stack: application environment administration and stability

Home lab

  • Ansible AWX (k3s based) — task automation and playbook execution in a controlled workflow
  • Public cloud VMs — test machines for validating solutions and scenarios
  • Docker — containerized apps (maintenance/upgrades/config)
  • UniFi lab — UDM/USW/UAP: VLAN, policies and segmentation testing

Education

  • University of Information Technology in Bydgoszcz — Computer Science, M.Sc. studies (2011–2013)
  • University of Information Technology in Bydgoszcz — Computer Science, B.Eng. studies (2009–2011)

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