NIKOLA KARLUSIC
SITE RELIABILITY ENGINEER
About Me
A skilled Site Reliability Engineer with over 6 years of hands-on experience in architecting and maintaining highly available and scalable systems. I specialize in bridging the gap between development and operations, leveraging robust automation, comprehensive monitoring, and CI/CD pipelines to ensure platform reliability and efficiency. My passion lies in proactive problem-solving and optimizing infrastructure for peak performance.
Experience
Site Reliability Engineer
Worldline
Nov 2023 - Present
100%
- Running the production environment by monitoring availability and taking a holistic view of system health.
- Building software and systems to manage platform infrastructure and applications.
- Improving reliability, quality, and time-to-market of our suite of software solutions.
- Measuring and optimizing system performance, with an eye toward pushing our capabilities forward, getting ahead of customer needs, and innovating for continual improvement.
- Providing primary operational support and engineering for multiple large-scale distributed software applications.
- Gathering and analyzing metrics from operating systems as well as applications to assist in performance tuning and fault finding.
Software Engineer (DevOps)
SIX
Sep 2022 - Nov 2023
100%
- Working hands-on in the area of DevOps toolchain and IT security.
- Developing, maintaining, and automating the dev-tool stack and pipeline as part of our DevOps scrum team.
- Improving application monitoring, alerting, and analytic systems, taking care of security-related topics like vulnerability management.
- Driving technical migration and release coordination end-to-end and defining operational features together with the team.
- Usage of containerization (Docker), configuration management (Saltstack) and shell scripting.
- Working in a productive Linux environment with Jenkins, Elastic Stack (ELK), Logstash, Kibana and Grafana.
Site Reliability Engineer
Upwork
Jan 2022 - Sep 2022
50%
- Implemented CI/CD tools (GitLab, CircleCI) for multiple clients, streamlining development processes.
- Orchestrated Linux server deployment and configuration using Terraform and Ansible, ensuring efficiency.
- Managed Docker images, deploying new ones and maintaining existing setups.
- Configured monitoring via Grafana and maintained database clusters (MongoDB, PostgreSQL), ensuring seamless operations.
- Network equipment handling and interconnecting, routers and switches racking and mounting, while using logical topology.
Linux SysAdmin
NSoft Company
Sep 2020 - Aug 2022
100%
- Researching and optimizing system performance.
- Analyzing metrics related to system infrastructure
- Implementing and maintaining security systems and CI/CD tools
- Implementing highly available systems.
- Maintaining infrastructure and all related services.
SysAdmin
NET d.o.o.
Apr 2019 - Sep 2020
100%
- Managing and securing over 20 Windows servers in a multi-vendor (Cisco, HPE, Dell) on-premise Hyper-V and VMware environment.
- Implementing and maintaining network security through CheckPoint firewall solutions and site-to-site VPNs.
- Playing a key role in large-scale projects, including a disaster recovery site implementation, a migration of 50+ servers to ESXi, and core infrastructure redesigns.
- Continuously expanding my skills into cloud solutions like Azure, GCP, and OCI, and earning multiple certifications in the process.
- Providing end-to-end support, from troubleshooting complex hardware and software issues to helping clients optimize their network infrastructure.
Network Engineer
ITARMI
Mar 2019 - Jan 2020
50%
- Network equipment handling
- Racking and mounting routers and switches
- Interconnecting networking equipment using logical topology
Skills
AutomationScalabilityReliabilityRedundancy
MonitoringObservabilityAlertingLogging
ProvisioningOrchestrationContainerizationCloud
NetworkingScriptingSecurity
Credentials
Certifications
- Cisco Networking Academy • CCNA
- Oracle Cloud Academy • OCIA
- Web dev • W3Schools
Languages
- Croatian • Native
- English • C1
- German • A2