Sebastian Koziatek

Work Experience

IT Training Specialist

JSystems sp. z o.o. – Warsaw, Poland | 2022 – Present

Deliver instructor-led training in Linux/Unix systems for enterprise clients and professionals preparing for system administration roles.
Conduct hands-on workshops focused on infrastructure automation and monitoring best practices.
Deliver AI-centric training sessions demonstrating the integration of AI tools into IT operations.
Design and deliver custom educational programs aligned with organizational infrastructure goals.

Senior DevOps Engineer

TietoEVRY – Ostrava, Czech Republic | 2017 – Present

Lead the development and optimization of scalable CI/CD pipelines to support cloud-native and hybrid environments.
Implement infrastructure as code (IaC) and automation strategies using Terraform, Ansible, and custom scripting.
Deploy and maintain secure, high-availability environments on Azure, Kubernetes, Proxmox, and VMware platforms.
Collaborate with cross-functional teams to enforce DevSecOps practices and continuous monitoring using Grafana, Prometheus, and Zabbix.

Unix Administrator

UniCredit – Warsaw, Poland | 2015 – 2017

Provided end-to-end administration and operational support for Unix-based infrastructure supporting banking and trading platforms.
Maintained and optimized Unix and Windows systems across production and development environments.
Configured and maintained backend services and critical middleware applications to ensure system stability and performance.
Contributed to system security audits, backup strategies, and disaster recovery planning.

System Administrator

SKOK “NIKE” – Poland | 2013 – 2015

Configured and maintained Unix/Linux and Windows server environments across internal business systems.
Designed, deployed, and administered VMware ESX-based virtual infrastructure.
Managed backup strategies, user provisioning, and security hardening for critical workloads.
Developed and maintained database systems, monitoring availability and performance.
Troubleshot and resolved networking issues in multi-segment infrastructures.
Implemented security protocols and data protection mechanisms in compliance with internal policies.

Education

Wyższa Szkoła Biznesu – National Louis University
Master’s Degree in Cybersecurity, Currently enrolled

Profile

For nearly two decades, I have been designing and maintaining IT infrastructure with a strong focus on automation, monitoring, and secure scalable systems. I specialize in DevOps tools, system hardening, and integrating AI-based solutions that boost efficiency and innovation within organizations.

Technical Proficiencies

Linux (RHEL, Debian), Unix, Azure, Kubernetes, Windows Server, Proxmox, VMware, Docker, Git, GitHub Actions, Azure Pipelines, Jenkins, Bash, Python, Terraform, Ansible, Grafana, Prometheus, Zabbix, AWS, GCP, System Hardening, Vulnerability Assessment, Penetration Testing, ServiceNow

Certifications

Microsoft Certified: Azure Fundamentals (AZ-900)
Microsoft Certified: Azure Administrator Associate (AZ-104)
ITIL Foundation Certificate in IT Service Management
HPE Certified: HP BladeSystem Administration
Unix Fundamentals UX1 (HP-UX)
Unix Advanced UX2 (HP-UX)

Languages

Polish: Native
English: Fluent
Czech: Basic

Professional Involvement

As an active member of the Cybersecurity Research Group at WSB-NLU, I regularly deliver talks at industry events, including the "ITSec4You" conference, where I share insights on cybersecurity topics. I am also the founder and lead presenter of the "DevOps Nest" initiative – an educational series focused on modern DevOps practices, infrastructure automation, and system reliability.

Hobbies

I am passionate about emerging technologies and continuously seek opportunities to expand my expertise in system architecture, cybersecurity, and DevOps practices. Outside of work, I engage in professional communities, follow industry publications, and pursue personal development through technical literature and online courses.