Milenko Letic, Developer in Banja Luka, Republika Srpska, Bosnia and Herzegovina
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Milenko Letic

Verified Expert  in Engineering

DevOps Engineer and Developer

Location
Banja Luka, Republika Srpska, Bosnia and Herzegovina
Toptal Member Since
November 16, 2022

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

Raiffeisen Bank International
ECS, Linux, Amazon EKS, Python 3, Kubernetes, DevOps, Jenkins...
Frequentis AG
Linux, Oracle, WebLogic, DevOps, Amazon Web Services (AWS), VMware...
Bay42 d.o.o.
Cloud Security, NGINX, Redis Clusters, MongoDB, SaltStack, DevOps...

Experience

Availability

Full-time

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

2019 - 2022
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.
Technologies: ECS, Linux, Amazon EKS, Python 3, Kubernetes, DevOps, Jenkins, Amazon Elastic Container Registry (ECR), AWS Lambda, Amazon Web Services (AWS), Amazon Virtual Private Cloud (VPC), Identity & Access Management (IAM), Amazon Simple Email Service (SES), AWS DevOps, Amazon Simple Notification Service (Amazon SNS), Security, LAMP, CI/CD Pipelines, Python, Virtualization, Bash, Cloud Security, Docker, Continuous Delivery (CD), Continuous Integration (CI), System Administration, Networking, Firewalls, NGINX, DNS, Apache, MariaDB, SSH, GitHub, Architecture, DevOps Engineer, Containerization, Lambda Functions, Serverless, AWS Fargate, Amazon RDS, Relational Database Services (RDS), Amazon EC2, VPN, Infrastructure as Code (IaC), AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, Continuous Development (CD), Terraform, Amazon S3 (AWS S3), Amazon CloudFront CDN, Amazon Elastic Container Service (Amazon ECS), Shell Scripting, SQL, HAProxy, AWS Cloud Architecture, Redis Cache, Unix, Linux Server Administration, PostgreSQL, Resource Management, Cloud Services, Cloudflare, SSL Certificates, AWS CloudFormation, SOC 2, Load Balancers, Autoscaling, Domain DNS Setup, AWS IAM, Proxy Servers, DNS Configuration, Network Security, Networks, Serverless Architecture, GitHub Actions, Gradle, Cloud, AWS NAT Gateway, Git, Jira, Confluence, New Relic, Datadog, DevSecOps, IT Security, Site Reliability Engineering (SRE), Containers, Cloud Migration, ELK (Elastic Stack), Elasticsearch, Kibana, Logstash, Microservices, Infrastructure, AWS VPN, Vulnerability Scanning, Linode Object Storage

System Engineer

2017 - 2019
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.
Technologies: Linux, Oracle, WebLogic, DevOps, Amazon Web Services (AWS), VMware, Amazon Simple Email Service (SES), AWS DevOps, Amazon Simple Notification Service (Amazon SNS), Security, LAMP, CI/CD Pipelines, Virtualization, Bash, Cloud Security, Docker, Continuous Delivery (CD), Continuous Integration (CI), System Administration, Networking, NGINX, DNS, Apache, SSH, GitHub, Architecture, DevOps Engineer, Containerization, Amazon RDS, Relational Database Services (RDS), HashiCorp, Amazon EC2, VPN, Infrastructure as Code (IaC), AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, Continuous Development (CD), Amazon S3 (AWS S3), Amazon CloudFront CDN, Shell Scripting, SQL, HAProxy, AWS Cloud Architecture, AWS Lambda, Unix, Linux Server Administration, PostgreSQL, Resource Management, Cloud Services, DigitalOcean, SSL Certificates, AWS CloudFormation, Load Balancers, Autoscaling, Domain DNS Setup, Web Hosting & Domain Setup, Amazon Virtual Private Cloud (VPC), AWS IAM, Proxy Servers, DNS Configuration, Network Security, Networks, GitHub Actions, Cloud, AWS NAT Gateway, Git, Jira, Confluence, DevSecOps, IT Security, Site Reliability Engineering (SRE), Containers, Cloud Migration, ELK (Elastic Stack), Elasticsearch, Kibana, Logstash, Microservices, Infrastructure, Vulnerability Scanning, VMware vSphere

Linux System Administrator

2016 - 2017
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.
Technologies: Cloud Security, NGINX, Redis Clusters, MongoDB, SaltStack, DevOps, Amazon Web Services (AWS), Amazon Simple Email Service (SES), AWS DevOps, Amazon Simple Notification Service (Amazon SNS), Security, LAMP, CI/CD Pipelines, Python, Virtualization, Bash, Docker, Continuous Delivery (CD), Continuous Integration (CI), System Administration, Networking, Firewalls, DNS, Apache, MariaDB, SSH, GitHub, DevOps Engineer, Containerization, HashiCorp, Amazon EC2, VPN, Infrastructure as Code (IaC), AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, Continuous Development (CD), Amazon S3 (AWS S3), Linux, Shell Scripting, AWS Cloud Architecture, Redis Cache, Linux Server Administration, Resource Management, Cloud Services, Cloudflare, DigitalOcean, SSL Certificates, Google Cloud, Load Balancers, Autoscaling, Email, Domain DNS Setup, Web Hosting & Domain Setup, Amazon Virtual Private Cloud (VPC), AWS IAM, Proxy Servers, DNS Configuration, Network Security, Networks, Serverless Architecture, GitHub Actions, Cloud, AWS NAT Gateway, Git, Jira, Confluence, Redmine, DevSecOps, IT Security, Site Reliability Engineering (SRE), Containers, Microservices, WordPress, Infrastructure, Vulnerability Scanning

Linux System Administrator

2015 - 2016
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.
Technologies: NGINX, MySQL, DNS, Raspberry Pi, Wireless, Hotspot, Amazon Web Services (AWS), Amazon Simple Email Service (SES), AWS DevOps, Security, LAMP, CI/CD Pipelines, Virtualization, Bash, Cloud Security, Continuous Delivery (CD), Continuous Integration (CI), System Administration, Networking, Firewalls, Apache, MariaDB, SSH, GitHub, WP Engine, Amazon EC2, VPN, AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, Continuous Development (CD), Amazon S3 (AWS S3), Linux, Shell Scripting, SQL, HAProxy, Redis Cache, Linux Server Administration, PostgreSQL, Cloud Services, DigitalOcean, SSL Certificates, AWS CloudFormation, Email, Domain DNS Setup, Web Hosting & Domain Setup, DomainKeys Identified Mail (DKIM), SPF, Mailchimp, Proxy Servers, DNS Configuration, Network Security, Networks, GitHub Actions, Git, Jira, Confluence, Redmine, IT Security, Containers, WordPress, Infrastructure, AWS VPN, Vulnerability Scanning

IT Administrator

2013 - 2015
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.
Technologies: Linux, VMware, VMware vCenter, VMware ESXi, Amazon Web Services (AWS), Security, LAMP, Virtualization, Bash, Cloud Security, System Administration, Networking, Firewalls, NGINX, DNS, Apache, SSH, GitHub, Amazon EC2, VPN, AWS Certified DevOps Engineer, AWS Certified Solution Architect, AWS Certified Cloud Practitioner, Shell Scripting, Linux Server Administration, Cloud Services, SSL Certificates, Domain DNS Setup, Spam Filtering, Web Hosting & Domain Setup, DomainKeys Identified Mail (DKIM), SPF, Mailchimp, Proxy Servers, DNS Configuration, Network Security, Networks, Serverless Architecture, IT Security, Infrastructure, AWS VPN, VMware vSphere

Linux System Administrator

2010 - 2013
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.
Technologies: Hosting, cPanel, Plesk, Linux, Slackware, CentOS, Debian, Monitoring, FreeBSD, Munin, Zabbix, Nagios, PHP, MySQL, Security, LAMP, Virtualization, Bash, System Administration, Networking, Firewalls, NGINX, DNS, Apache, MariaDB, SSH, WP Engine, VPN, Shell Scripting, SQL, Unix, Linux Server Administration, PostgreSQL, SSL Certificates, Email, Domain DNS Setup, Spam Filtering, Web Hosting & Domain Setup, DomainKeys Identified Mail (DKIM), SPF, Mailchimp, Proxy Servers, DNS Configuration, Network Security, Networks, Linux Kernel, IT Security, WordPress, Infrastructure, VMware, VMware vSphere

Free Course Learning Platform

https://programiranje.ba
Jekyll's one-page project serves as a front end for free courses on YouTube. The idea behind this project is to bring some knowledge to beginners in the IT field and teach some of the best practices, so one can quickly speed up with a topic and get a job in the IT field at the junior level.

Udemy Instructor

https://www.udemy.com/user/milenkoletic/
As an Udemy instructor with more than 16,000 students, I teach people worldwide about best industry practices, which I learned during my day-to-day work experience.

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/
A fork website of Linux Journey that was created to document the journey I took to learn Linux. It is far from over, and as everyone's journey is a little different, this website further improves the knowledge of the greater Linux community through contribution and collaboration.

Self Web Hosting Server

https://eu-srv-01.yugohosting.com/
Maintaining my own web hosting server based on a CentOS Web Panel solution. Currently, I host around 13 web pages, primarily LAMP-based. Also, I regularly do pathing and security assessments on the server.

DevOps Captain's YouTube Channel

https://youtube.com/@devops_captain
Welcome to the DevOps Captain's YouTube channel, where I serve as the lead instructor, guiding you through the fascinating world of DevOps, Linux, Security, Cloud, and more! As a passionate tech enthusiast and educator, I aim to provide expert-level knowledge to help you excel in the tech industry.

In 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.

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, 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, 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, Kubernetes, Raspberry Pi, FreeBSD, AWS Lambda, LAMP, Unix, New Relic, WordPress, 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, 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, Amazon Cloud Services Solution Architect

Frameworks

SPF

Libraries/APIs

Terragrunt

FEBRUARY 2024 - FEBRUARY 2026

HashiCorp Certified: Terraform Associate (003)

HashiCorp

DECEMBER 2023 - DECEMBER 2026

CKA: Certified Kubernetes Administrator

Cloud Native Computing Foundation CNCF

NOVEMBER 2023 - PRESENT

Google Cybersecurity Certificate

Coursera

FEBRUARY 2019 - FEBRUARY 2022

AWS Certified Solutions Architect – Associate

Amazon Web Services

Collaboration That Works

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