Ivan Milivojevic

Skills

• Linux OS (Centos/Debian(Fedora,Ubuntu));
• Windows Servers
• Virtualization (Hyper-V, VMware)
• AD, DHCP, DNS, GPO, FTP, VPN, WSUS, TCP/IP Protocols.

Cloud providers:

• Amazon Web Services (AWS)
• Google Cloud Platform (GCP)

CI/CD, Build tools, Version Control Systems:

• Jenkins
• GCP CloudBuild
• AWS pipeline
• Spinnaker
• GitHub actions
• GitLab CI
• Bitbucket

Configuration management tools:

• Terraform
• Ansible
• SaltStack
• Chef
• Puppet
• AWS Cloudformation

Container management tools:

• Kubernetes, Helm;
• Docker, Docker-compose, Docker swarm.

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Work Experience

Senior DevOps Engineer, DEVTECH, 2019 - present

Cloud marketplace system project:

- Provisioning of AWS resources via infrastructure as code (Terraform, multiple AWS accounts). 

- Provisioning and managing of Kubernetes clusters (multiple Kubernetes clusters, EKS). 

- Managing of CI/CD (Github Actions, Terraform, Helm, Argocd, Kubernetes). 

- Managing of Logging and Monitoring (Sumologic). 

- Standardizing applications in Helm charts (Helm, Kubernetes, Docker). 

- Eliminating static API credentials usage and increasing overall security regarding AWS access from Github Actions by configuring Github Actions OIDC setup on AWS (Github Actions, AWS, Terraform) 

- Arbitrating a migration projects from sops to Secrets Manager (Github Actions, Sops, AWS SSM). 

- 200% decreasing resolution time by improving troubleshooting performance lookup during RDS CPU alerts (Python, AWS). 

- Arbitrating a migration of helm charts to use remote helm charts, standardizing CI/CD (Helm, Github Actions, Kubernetes). 

Social app project:

- Provisioned AWS resources via infrastructure as code (Terraform, Packer, multiple AWS accounts). 

- Set up a CI/CD (Jenkins, Flux, Github, Sonar). 

- Set up and maintained Kubernetes clusters (multiple Kubernetes clusters, Kops). 

- Packaged and standardized applications in Helm charts (Helm, Kubernetes, Docker). 

- Set up and standardized GitOps deployment to Kubernetes clusters (Flux, Jenkins, Helm, and Github). 

Transportation app project:

- Managed Kubernetes clusters (multiple Kubernetes clusters, Kops). 

- Managed CMS system (Puppet). 

- Provisioned AWS resources via infrastructure as code (Terraform, Packer). 

- Audited and standardized CI/CD on Spinnaker (Packer, Spinnaker, EC2, Kubernetes). 

- Set up and maintained Secret Management system (Vault, AWS KMS, DynamoDB). 

- Configured and maintained Logging and Monitoring (Graylog, Datadog). 

- Configured and maintained internal AD and IDP (FreeIPA, Keycloak). 

- Managed k8s cluster upgrade from 1.14 to 1.18 version without downtime (Kops, Kubernetes).

Senior DevOps Engineer, Endava, 2017 - 2019

- Set up and managed Serverless architecture on AWS (Lambda, S3, SNS). 

- Maintained AWS infrastructure (multiple AWS accounts with 100+ EC2 instances per account). 

- Managed CMS System (Ansible, Puppet). 

- Set up and maintained Logging and Monitoring system (CloudWatch, TICK, ELK, Grafana, Nagios). 

- Setup of upgrading and patching 1.5k EC2 instances without downtime (Ansible, AWS). 

- Held courses and workshops about Terraform. 

- Wrote custom Ansible modules for managing Lambda functions, IAM roles, and CloudWatch Alarms and Events (Ansible, AWS, Terraform). 

- Wrote scripts for managing user passwords on various platform components (Ansible, Python).

System Engineer, P3 Communications, 2014 - 2017

- Provisioned and maintained Serverless architecture based on AWS (S3, Lambda, SNS). 

- 10x reduction in cloud computing costs by improving billing, performance, and infrastructure needs. 

- Customized tracing utility on external servers, mitigated packet loss on traces toward zero. 

- Set up a monitoring and logging system for checking 2XX external servers (Zabbix). 

- Provisioned AWS infrastructure (ELB, EC2, ASG). 

- 400% decreased delivery time by configuring and standardizing a provisioning system for managing 2XX external servers (Chef). 

- Managed internal projects upon client’s request. 

- Helped migrate products from physical servers to AWS.

Voice Engineer, Orion Telekom, 2010 - 2014

- Configuration, maintenance and implementation of PBX systems (IVR, Conference, Voicemail) for business VoIP customers. 

- Set up a solution for sending and receiving fax without traditional fax equipment. This service is still active. 

- Engaged as a Level 3 support for interconnections with other domestic and foreign telco providers. 

- Coordinated a migration of 50k VoIP users to a new VoIP Class4 platform. 

- 500% decreased delivery time by set up a solution for autoprovisioning of 30k residential VoIP users. 

- 300% decreased delivery time by automated provisioning of embedded VoIP equipment

System Engineer, Logo d.o.o, 2010 - 2010

- Setup of network equipment (ASA 5505/5510). 

- Configuration and maintenance of network hardware. 

- Configuration, maintenance and setup of several Asterisk PBX based system sites..