Štefan Jarina

Hello, I'm Štefan Jarina

DevOps Engineer. | Manager. | Linux & Solaris Specialist.
stefan@jarina.io
+420 727-893-416
Ostrava, Czech Republic

Štefan Jarina

DevOps Engineer. Manager. Linux Specialist.

Skillset

Linux Admin (REDHAT, UBUNTU)
Volume Managers (LVM/ZFS)

Automation (Ansible)
Scripting (BASH/Python)
Typescript (React, Node.js)
.NET Core [C#] & Powershell 7+ (in progress)
Go Language (in progress, small apps)
Databases (SQL)
Databases (MongoDB)

English
Reporting (Performance, KPIs)

Social Profiles

What is my story

Due to my interests in new technologies since my early years, I decided to join an IT company right after I left school. My very first job was a Monitoring Specialist at T-Systems Slovakia. While it was good for start of my professional career, I wanted to improve my knowledge in the Linux/Unix areas and after 3 years I applied for a 2nd level UNIX/Solaris Administrator position. I succeeded and got the pleasure to work with some amazingly skilled engineers who helped me to improve my knowledge in various areas. At that time I became interested in scripting and automation where a sysadmin position offered plenty of opportunities.

At the end of 2011 I decided to move to the Czech Republic and joined OKIN where I have been working as a Junior UNIX Administrator. Thanks to my past experience I was promoted to a Senior UNIX Administrator in just 9 months. During my senior position I developed several internal tools/scripts that are still actively used by the whole teams.

In 2014 my team leader left the company and as I had been her deputy for almost 2 years, I was promoted to Team Leader. I was managing the team for 1 and a half year and played a major role in transforming the team from 8x5 to 24x7 which was unbelievably difficult but was a very good challenge.

In October 2014 I was approached by the Managing Director of OKIN to help start a new project of Cloud Services. I have done over 400 interviews in first 6 months and helped to fill about 100 positions - doing all this while still running the Service Desk team.

In September 2015 we found my replacement team leader to take over from me for my old team and I became the Team Leader for Linux and DBA teams within this new project. I've built team from scratch to around 20 people in a 24x7 environment in Tier 1 & 2.

In August 2016 I got a chance to work for Tieto company as a Line Manager for Windows Tier 3 engineers and decided to leave Okin and pursue this new challenge.

After 9 years in operations I felt like I need a change and as of March 2018 I am now leading several teams of DevOps Engineers and Software Developers.
In this role I am split roughly 70:30 between technical and managerial role.
- As a manager I am responsible for 5 agile teams totaling roughly 30 people.
- As a technician I am part of DevOps team working primarily on apps/tooling/automation in C# and Typescript (Azure Functions, Azure DevOps extensions, web apps, desktop apps, cli tools) and Linux automation in Python/Ansible (mainly from RedHat family).

As of October 2022 I work as a DevOps Engineer for Veeam Software. Decided to fully switch to technical role. I focus on DevOps (pipelines, automation, cli apps) and primarily work in .NET (C#) and Ansible.

years of IT experience

+

years OLD

beautiful daughters

More about me

CERTS | RECOMMENDATIONS | TECHNOLOGIES

ITIL® Foundation Certificate in IT Service Management

EXIN, License 5416345.20423139
As of July 2015

Linux

HOME:
Used Archlinux for about 5 years, nowadays it is Fedora to be closer to what I use at work.
For past 3 years my main DEV environment is Windows though with WSL2 (using Almalinux there) WORK:
Worked with almost all flavors of Linux and UNIX where the most beloved one is RedHat followed by Solaris 11.
Worked for almost 4 years with Solaris 10 and 11, so I have extensive knowledge in technologies like ZFS/SMF/LDOM ...
For past 3 years working exclusively with RedHat (including Almalinux and CentOS) and Ubuntu Server 18.04+

Coding

Started at school with HTML/PHP/jQuery/CSS, went through the scripting languages like Bash/Python/Perl/Ruby. Lately using a lot of Typescript with React.
Sometimes I use Go Language for linux tool-smithing.
As of early 2018 I work in .NET environment writing tooling with C# and Powershell. Automation with Ansible became my daily bread.

linkedIn recommendations

Malwina Wąsowska-Domirska (former direct line manager)

It is my pleasure to recommend Stefan, which I know for just under two years. I'm constantly impressed with Stefan's attitude and productivity. He is both very bright and motivated. He's is a quick learner and has shown the ability to digest large volumes of information. Stefan also has the analytical skills to diagnose problems and devise viable solutions. He is very consistent in his work and tries to constantly improve all his skills. He is one of the best employees of the team whom I can rely on. I recommend him without reservations.
Find more on my linkedIn profile

I'm currently employed.

I'm working as DevOps engineer in R&D department of the leader in backup, recovery and data management solutions. (Veeam Software)

I currently don't actively seek any new opportunities.

Resume

My education and experience.

Experience

DevOps Engineer | R&D | VBO & VBE

  • Develops and maintains working systems for automated assembly of the product and individual parts of the project
    • .Net Framework and .Net Core (C#)
  • Ensures the performance of high-quality work, on time, at a high technical level
  • Takes part in the development of long-term and annual plans for research and design work together with software engineers
  • Implements the tasks of configuring and deploying individual parts of the project
  • Works out, implement, puts into operation and debugs automated tools to control the implementation of requirements for the design of the code developed in the project

Veeam Software

October 2022 - now

Manager | Development & DevOps | PPF | TIPS Application

TECHNICAL ROLE (70% of time):

  • Responsible for Linux Environment (mainly systems from RedHat family)
  • Development in .NET Core (C#) (Azure Functions, libraries, ASP.NET Core, WPF, etc.)
  • Development in React (Typescript) (Azure DevOps Extensions, Web Apps)
  • Automation in Bash, Python, Node, PowerShell (including PowerShell 7+ on Linux)
  • Writing Ansible playbooks both for Linux and Windows systems
  • Moving several services to Kubernetes environment

MANAGEMENT ROLE (30% of time):

  • Managing several teams of DevOps, Software Developers, Testers and Documentation Specialists
  • Managing and coaching the team, empowering them to take the next step in their profession
  • Headcount control, recruitment
  • Active monitoring of team performance, KPIs
  • Providing reporting on daily/weekly/monthly basis
  • Point of contact for escalations, customers, other teams
  • Together with the other team managers organizing and appointing key roles in the development organization

Tietoevry

March 2018 - now

Line Manager | Windows Operations | Tier3

  • Managing the team of Microsoft Windows Tier 3 Specialists
  • Managing and coaching the team, empowering them to take the next step in their profession
  • Develop capabilities within the team
  • Attracting new employees and building a network of sub-contractors to be able to fulfil the overall needs of the organization
  • Be an agile coach for the team assuring that our agile vision is reached
  • Building relationships inside the organization to enable a strong culture of cooperation
  • Assuring we have the right people in the right places at the right time
  • Taking care of major customers from Nordic countries primarily
  • Headcount control, recruitment
  • Responsibility for financial, budget control
  • Active monitoring of team performance, KPIs
  • Providing reporting on daily/weekly/monthly basis
  • Point of contact for escalations, customers, other teams

Tieto

August 2016 - February 2018

Team Leader | Verizon Global Support Services
Linux & DBA teams | Tier1 & Tier2

  • Managing the team of Linux and DBA administrators in the environment of more than 20,000 ESX hosts
  • Taking care of major customers from Fortune 500 - Delivering IaaS and PaaS solutions
  • Building teams from zero to 20 engineers
  • Helped with recruitment for 140 positions for Cloud Services Project
  • Headcount control, recruitment (over 400 interviews done in past half a year)
  • Responsibility for financial, budget control
  • Active monitoring of team performance, KPIs
  • Creation of the Reporting Framework for the team
  • Providing reporting on daily/weekly/monthly basis
  • Running team in 24/7 shift model
  • Developed Shift Handover Tool
  • Point of contact for escalations, customers, other teams
  • Building stable and efficient team, providing technical trainings for the colleagues

Major technologies team has experience in:

  • Virtualization (VMware, XEN, Hyper-V)
  • Unix/Linux (Red Hat, SUSE Linux, Solaris, HP-UX)
  • Databases (Oracle 10g/11g, MSSQL, MySQL, PostgreSQL, DB2)
  • Tools (Puppet, own Verizon in-house ticketing system)

OKIN BPS

September 2015 - August 2016

Team Lead Server & Service Management

  • Managing the team of Systems administrators within an environment of over 1600 servers
  • Headcount control, recruitment
  • Responsibility for financial, budget control
  • Active monitoring of team performance, KPIs
  • Providing reporting on daily/weekly/monthly basis
  • Running team in 24/7 shift model
  • Point of contact for escalations, customers, other teams
  • Building stable and efficient team, providing technical trainings for the colleagues

OKIN BPS

February 2014 - August 2015

Senior UNIX Systems Specialist

  • Deputing Team Leader

  • Operation of UNIX/Solaris Systems technology
  • installation, administration, patching, upgrading
  • troubleshooting for 1st/2nd level tasks
  • incident, change, problem management

  • troubleshooting tasks (e.g.)
    • No IP connection
    • syslogd process configuration
    • high usage of space/swap space
    • various ZFS errors)
  • change tasks (e.g.)
    • FAN/DISK replacement
    • ILOM patching
    • middleware patching
  • deployment tasks (e.g.)
    • installation of servers
    • upgrading OS
    • upgrading ILOM

In team I was dedicated to solve backup related issues.
Specialization in IBM Tivoli Storage Manager
  • installing software to UNIX based systems, configure clients, solving issues with failed backups
  • solving restore requests, managing schedules for backups
  • communicating with Oracle to solve issue related to tape library

  • used Python for system scripting and automation

OKIN BPS

September 2012 - January 2014

Junior UNIX System Specialist

  • Operation of UNIX/Solaris Systems technology
  • installation, administration, patching, upgrading
  • troubleshooting for 1st/2nd level tasks
  • incident, change, problem management

OKIN BPS

November 2011 - August 2012

UNIX/Solaris System Administrator

  • Operation of UNIX/Solaris Systems technology
  • installation, administration, patching, upgrading
  • incident, change, problem management
  • deployment (SOM@SAPv2 deployment tool)
  • administration of 100 server per FTE (about 800 servers per team)

T-System Slovakia s.r.o.

November 2010 - November 2011

Monitoring Specialist

  • communication with customer
  • work with ticketing tool
  • 12-hours shift work
  • monitoring of thousands ofservers, 1st level support
  • for few customers I had 5min reaction time to create ticket in COSIMA and call technician
  • communication with customer/engineer everyday in english via mail/phone or face-to-face

T-System Slovakia s.r.o.

July 2008 - October 2010

Education

Electrical and Electronics Engineering

Subject of study was telecommunication technologies and programming.
I've obtained CCNA certificate, however it is expired as I went different path after the school.

Composite secondary school, Michalovce

2004 - 2008

Contact Me

Drop me a line or give me a ring. I'd love to hear from you.

I am usually focused to my work during EMEA business hours, so might respond a bit later.