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.
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.
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.
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.
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.
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.
Developed a Python SMPP backend solution using the Twisted network engine.
Increased throughput by 20 times, enabling parallel execution of multiple backend instances.
The solution is currently in production.
Migrated Python, Java, and PHP environments to a Docker-based environment.
Improved deployment to the development environment by leveraging Docker images.
Reduced rollbacks for quicker development iteration.
