Milenko Letic
Verified Expert in Engineering
DevOps Engineer and Developer
A Linux terminal and Penguin fan, Milenko is inspired by new technology and learning exciting things. He is most productive when working in an open-minded team. A quick learner and great listener, Milenko is ready to take the initiative and responsibility and constantly tries to make daily work more automated, giving tedious tasks to computers and leaving the best part for a people team.
Portfolio
Experience
Availability
Preferred Environment
Linux, Terminal, Amazon Web Services (AWS), Docker
The most amazing...
...thing I've done is a custom vulnerability management solution that brings more insight and quicker reactions to the latest common vulnerabilities and exposures.
Work Experience
DevOps Engineer
Raiffeisen Bank International
- Designed and implemented a vulnerability patch management solution.
- Worked on implementing AWS Command Line Interface (AWS CLI) access using Python, PingFederate, and Microsoft Active Directory (AD).
- Worked on a central logging and monitoring solution.
- Managed a security champions team of three people.
System Engineer
Frequentis AG
- Optimized building and deployment, implemented a CI/CD pipeline, and reduced the delivery process by around 70%, from about four hours to approximately 30 minutes.
- Integrated a WebLogic high availability cluster in Amazon EC2 with AWS Elastic Load Balancing (ELB), significantly reducing downtime.
- Implemented hardened Oracle 7-based Amazon Machine Image (AMI) in Amazon EC2 on AWS.
Linux System Administrator
Bay42 d.o.o.
- Implemented centralized log management based on ELK stack in Amazon EC2 on AWS. Introduced bastion and jump box host on AWS, significantly improving overall security and a developer's workflow.
- Implemented highly available Redis Cluster and MongoDB clusters in Amazon EC2 on AWS.
- Introduced SaltStack for DevOps and infrastructure automation.
Linux System Administrator
Oroundo
- Designed and implemented an in-house server (IHS) RaspberryPi hotspot-based system.
- Reduced costs by around 70% and increased content delivery by almost 90%.
- Introduced and implemented a simple web system for tracking active and failed IHS instances worldwide.
IT Administrator
Bravo Systems
- Developed a fully-automated VMware process of virtual operating system update, software delivery, and package update with Bash (Linux) and PowerCLI (Windows).
- Sped up the delivery process and shifted from a manual to a fully automatic and scripted approach.
- Learned a VMware virtualization stack and best practices for upgrading in a production environment.
Linux System Administrator
Europronet d.o.o.
- Designed and implemented a fully-virtualized HotspotSystem based on pfSense and CoovaChilli.
- Introduced snapshots for faster delivery and recovery in case of failure.
- Designed and implemented simple employee timesheets in PHP and MySQL.
- Improved a monitoring system by extending with Nagios, Monit, Munin, and Zabbix tools.
Experience
Free Course Learning Platform
https://programiranje.baUdemy Instructor
https://www.udemy.com/user/milenkoletic/This allows me to stay up to date with the latest and greatest technology in IT while learning on my own and, at the same time, getting more insight into how others understand IT based on my students' questions.
Tux Journey
https://tuxjourney.com/Self Web Hosting Server
https://eu-srv-01.yugohosting.com/DevOps Captain's YouTube Channel
https://youtube.com/@devops_captainIn this channel, you'll discover a wealth of tutorials, tips, and insights tailored to newcomers and seasoned professionals. From mastering Linux administration to harnessing the power of cloud computing and beyond, I cover various topics to enrich your skill set.
Join our ever-growing community of DevOps enthusiasts, and let's embark on a journey of continuous learning, exploration, and innovation. Be sure to subscribe, like, share, and activate the notification bell to stay informed about the latest content.
As the lead instructor, I'm dedicated to empowering you with the knowledge and expertise needed to thrive in your tech endeavors. Thank you for being a valued part of this educational experience.
Skills
Languages
Bash, Python, SQL, Python 3, C, HTML5, PHP
Tools
VMware, Plesk, Amazon Virtual Private Cloud (VPC), VPN, Terraform, AWS IAM, Git, Jira, Confluence, ELK (Elastic Stack), Kibana, Logstash, Amazon EBS, Apache HTTP Server, Terminal, Amazon EKS, NGINX, Jenkins, Amazon Elastic Container Registry (ECR), Amazon Simple Email Service (SES), Amazon Simple Notification Service (Amazon SNS), Ansible, Apache, GitHub, HashiCorp, Amazon CloudFront CDN, Amazon Elastic Container Service (Amazon ECS), AWS CloudFormation, Mailchimp, Redmine, VMware vSphere, AWS CloudTrail, SaltStack, Munin, Zabbix, Nagios, AWS Fargate, Gradle
Paradigms
DevOps, Hosting, DevSecOps, Microservices, Continuous Delivery (CD), Continuous Integration (CI), Continuous Development (CD), Serverless Architecture
Platforms
Linux, Docker, cPanel, Slackware, Amazon Web Services (AWS), Amazon EC2, DigitalOcean, AWS ALB, Kubernetes, Raspberry Pi, FreeBSD, AWS Lambda, LAMP, Unix, New Relic, WordPress, Heroku, Oracle, CentOS, Debian
Storage
Amazon S3 (AWS S3), Elasticsearch, MySQL, MariaDB, WP Engine, Redis Cache, PostgreSQL, Google Cloud, Datadog, MongoDB
Industry Expertise
Network Security, Cybersecurity
Other
Cloud Security, System Administration, Networking, DNS, AWS DevOps, Security, CI/CD Pipelines, SSH, Virtualization, DevOps Engineer, Shell Scripting, Linux Server Administration, Cloud Services, SSL Certificates, Load Balancers, Autoscaling, Email, Domain DNS Setup, Web Hosting & Domain Setup, DNS Configuration, Networks, GitHub Actions, AWS NAT Gateway, IT Security, Containers, Infrastructure, AWS VPN, Vulnerability Scanning, Startups, Vulnerability Management, Firewalls, ECS, Wireless, Hotspot, VMware vCenter, VMware ESXi, Identity & Access Management (IAM), FTP, SFTP, Web Hosting, Architecture, Containerization, Lambda Functions, Amazon RDS, Relational Database Services (RDS), Infrastructure as Code (IaC), AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, HAProxy, AWS Cloud Architecture, Resource Management, Cloudflare, Spam Filtering, DomainKeys Identified Mail (DKIM), Proxy Servers, Cloud, Linux Kernel, Site Reliability Engineering (SRE), Cloud Migration, Linode Object Storage, WebLogic, Redis Clusters, Monitoring, Serverless, SOC 2, Threat Analytics, Vulnerability Assessment, Security Information and Event Management (SIEM), NIST Cybersecurity Framework, Network Analyzer (sniffing) tools, Intrusion Detection Systems (IDS), Information Security
Frameworks
SPF
Libraries/APIs
Terragrunt
Certifications
HashiCorp Certified: Terraform Associate (003)
HashiCorp
CKA: Certified Kubernetes Administrator
Cloud Native Computing Foundation CNCF
Google Cybersecurity Certificate
Coursera
AWS Certified Solutions Architect – Associate
Amazon Web Services
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