Kresimir K.

Kresimir K.

Senior DevOps Engineer

Osijek, Croatia
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About Me

Krešimir is a skilled DevOps/System Engineer with 12+ years of hands-on industry experience working on the iteration of solutions for data acquisition, storage, processing and analysis. He employs a detail-oriented and highly focused approach to security, automation, and reliability on projects; always looking for challenging ways to improve his existing skillset and expertise.

Portfolio

Developer - Increasing Asynchronous Python backend throughput
Developer - Increasing Asynchronous Python backend throughput

Worked on the Python SMPP backend solution based on the Twisted network engine which had become a bottleneck and the business was struggling for further growth. The solution increased throughput by 20 times; enabling multiple instances of the backend app to run in parallel. The backend solution is currently in production.

Developer - Creating Docker environment for existing code
Developer - Creating Docker environment for existing code

Supervised the migration of different environments (Python, Java, PHP) to a Docker-based environment. This improved the deployment to development environment based on Docker images, and quicker rollbacks. The new solution is being used in the client's development environment.

Work history

UpStack
UpStack
DevOps/System Engineer
2019 - Present (3 years)
Remote
  • Creating and developing innovative software solutions for clients across a broad range of industries.

  • Participate in scrums consisting of cross-functional teams, both software and hardware.

  • Ensure that features are being delivered efficiently and on-time.

Lab Lateral
Lab Lateral
SysOps/DevOps
2017 - 2018 (1 year)
London, United Kingdom (Remote)
  • Provided expertise on mission critical LAMP stack for Magento eCommerce platforms and managed/monitored 50+ AWS Linux EC2 instances.

  • Deployed Imperva Incapsula WAF for web protection, configured TeamCity CI/CD pipelines for automated deployments and reduced loading times using various caching methods and CDNs.

  • Deployed multiple layers of caching (CDN, HAProxy, Varnish, Nginx) to significantly lower TTFB on e-commerce sites with a direct correlation between speed and sales conversion.

Integra
Integra
System Engineer
2015 - 2017 (2 years)
Zagreb, Croatia
  • Designed, implemented and maintained different enterprise grade, high-availability clusters on VmWare/Hyper-V virtual environments for clients.

  • Wrote Powershell scripts for automation and implemented FortiNet UTM solutions into existing networks.

  • Worked on the deployment and expansion of various SAN solutions (IBM/HP) and Veeam backup solutions.

Viahub Corp
Viahub Corp
System Engineer/DevOps
2014 - 2017 (3 years)
New York, United States (Remote)
  • Designed, implemented, migrated and managed Viahub's production environment using VMware/vSphere stack.

  • Optimized asynchronous Python code to achieve a 20x increase in message throughput and reliability per second.

  • Troubleshot complex network issues and reduced deployment time by using Ansible for configuration management.

Werkos d.o.o
Werkos d.o.o
System Administrator
2007 - 2015 (8 years)
Osijek, Croatia
  • Oversaw tasks for system uptime, upgrades and backup; working on migrations from physical to virtual servers with minimal downtime.

  • Managed the client's Microsoft Windows Server environment including a few Linux virtual servers and over 100+ workstations.

  • Designed and implemented security policies and best practice guidelines.

Education

Education
CCNA
Cisco Academy, ETF Osijek
Education
Sveučilište 'Josipa Jurja Strossmayera' u Osijeku