Dario Duvnjak, Developer in Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina

Dario Duvnjak

Software Developer

Location
Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina
Toptal Member Since
April 4, 2016

Dario is an experienced and highly skilled software engineer, although he likes to think of himself, first and foremost, as a problem-solver. He specializes in cloud computing (AWS), DevOps, and platform engineering. Dario is a great person to work with and an excellent developer.

Dario is available for hire
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Portfolio

PitchStone Technology, LLC
Amazon Web Services (AWS), Spring Boot, AWS Lambda...
Atlantbh
OpenShift, Kubernetes, AWS DevOps, DevOps, Linux, Ubuntu...
Avail Health (via Toptal)
Amazon Web Services (AWS), Jenkins, Node.js, Linux, Bash Script...

Experience

Agile Software Development - 11 yearsGit - 11 yearsJenkins - 11 yearsLinux - 10 yearsDevOps - 10 yearsAmazon Web Services (AWS) - 10 yearsDocker - 5 yearsPuppet.js - 4 years

Location

Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina

Availability

Part-time

Preferred Environment

Visual Studio Code (VS Code), Git, MacOS

The most amazing...

...project I've helped develop is a DevOps framework for automated operations, provisioning, and infrastructure management via AWS, Puppet, and Docker.

Work Experience

2020 - 2022

Lead DevOps Engineer

PitchStone Technology, LLC
  • Used CloudFormation and infrastructure as code (IaC) principles to provision and maintain infrastructure. Utilized AWS ECS to run both scalable and highly available web services and short-running tasks. Migrated from MySQL to AWS Aurora.
  • Architected and implemented Serverless Solutions for authentication, automation, and security using AWS Lambda. Implemented a custom monitoring and alerting system based on AWS CloudWatch, Lambda, Prometheus, and New Relic.
  • Implemented a custom security framework and procedures based on AWS Security Hub, AWS Web Application Firewall (WAF), ECR, Inspector, and Prowler.
  • Designed and implemented disaster recovery automation and procedures.
Technologies: Amazon Web Services (AWS), Spring Boot, AWS Lambda, Amazon Elastic Container Service (Amazon ECS), Amazon Aurora, Linux, Ubuntu, Agile Software Development, Continuous Integration (CI), Bash Script, Continuous Deployment, AWS CloudFormation, Java, Apache JMeter, Bitbucket, Bash
2016 - 2020

Lead Engineer

Atlantbh
  • Performed the containerization of highly available and resilient microservice architecture to run it on the OpenShift platform.
  • Planned, designed, and implemented pipelines for automatic building, testing, and deployment.
  • Developed a robust architecture for logging, alerting, and monitoring services and infrastructure.
  • Worked on enabling DevOps methodology across the whole team, where developers and QA engineers partnered closely with DevOps engineers and were comfortable configuring and scaling the infrastructure, running pipelines, and utilizing the monitoring stack.
Technologies: OpenShift, Kubernetes, AWS DevOps, DevOps, Linux, Ubuntu, Amazon Web Services (AWS), Agile Software Development, AWS Lambda, Continuous Integration (CI), Bash Script, Continuous Deployment, AWS CloudFormation, GitHub, Java, Ruby on Rails (RoR), Automated Testing, CentOS, NGINX, Apache JMeter, Bash
2017 - 2017

AWS Continuous Build/Test/Deploy

Avail Health (via Toptal)
  • Set up a fully automated continuous integration system for a Node.js app using Jenkins on AWS Elastic Beanstalk.
  • Wrote the complete infrastructure using AWS CloudFormation.
  • Implemented autoscaling of services based on application load.
Technologies: Amazon Web Services (AWS), Jenkins, Node.js, Linux, Bash Script, Continuous Deployment, Automated Testing, Bash
2012 - 2016

DevOps Engineer

Freelance
  • Used Jenkins, Protractor, Mocha, and Grunt to build, test and deploy a Node.js app to AWS Elastic Beanstalk.
  • Created a high-availability auto-scalable environment for Magento on AWS.
  • Wrote a Packer template and a Puppet module for automatic generation of server images for a Java service on AWS, DigitalOcean, Rackspace, OpenStack, and Docker.
  • Automated a deployment procedure for Rails, Nginx, Sidekiq, Redis, and MongoDB app using Capistrano.
  • Wrote a Web UI with Ruby and Sinatra for provisioning customized WordPress instances on AWS via Puppet.
Technologies: Amazon Web Services (AWS), Jenkins, Node.js, Ruby, Vagrant, Docker, Linux, Bash Script, Continuous Deployment, GitHub, WordPress, Ruby on Rails (RoR), Automated Testing, Packer, CentOS, NGINX, Bitbucket, Bash
2011 - 2016

Senior Engineer

Atlantbh
  • Developed infrastructure for continuous integration and delivery platform.
  • Coordinated test-driven development efforts with multiple teams spanning the USA, Europe, and India.
  • Wrote integration tests and executed integration testing and analysis.
  • Provided performance testing and optimizing of AWS infrastructure.
  • Integrated different open-source technologies into both the core product and internal operations.
  • Improved existing and wrote new Puppet modules, including contributing to popular open-source modules.
Technologies: Amazon Web Services (AWS), Docker, Ruby, Puppet, Linux, Ubuntu, Agile Software Development, AWS Lambda, Continuous Integration (CI), Bash Script, Continuous Deployment, AWS CloudFormation, GitHub, WordPress, Ruby on Rails (RoR), Automated Testing, Packer, CentOS, NGINX, Apache JMeter, Bash

Experience

tenant.pp

This is Puppet code whose purpose is to deploy and configure a Ruby-based application from the ground up on a fresh machine. It's part of this repo: https://github.com/dtk/dtk-provisioning/tree/bootstraping
Repo's README provides instructions on how to run it.

Skills

Languages

Bash Script, Bash, Java, Ruby

Libraries/APIs

Puppet.js, FFmpeg, Node.js

Tools

Jenkins, Vagrant, Git, AWS CloudFormation, Puppet, Bitbucket, GitHub, Capistrano, Packer, Apache JMeter, Apache, NGINX, Sublime Text, Bamboo, Amazon Elastic Container Service (Amazon ECS)

Paradigms

DevOps, Continuous Integration (CI), Continuous Deployment, Automated Testing, Agile Software Development

Platforms

Amazon Web Services (AWS), Linux, Ubuntu, WordPress, CentOS, Docker, Kubernetes, AWS Lambda, MacOS, OpenShift, Meteor, Magento, Visual Studio Code (VS Code)

Other

AWS DevOps, Gitolite, Kubernetes Operations (Kops)

Frameworks

Ruby on Rails (RoR), Spring Boot

Storage

PostgreSQL, MongoDB, MySQL, Amazon Aurora

Education

2003 - 2010

Bachelor's Degree in Telecommunications

University of Sarajevo - Sarajevo