They should have worked on Linux OS.
AWS - EC2, IAM, VPC, management of various instances and autoscaling groups.
GitHub Runners - They should have experience in configuring github self-hosted runners. (This is very significant and most needed).
If they have worked in Azure DevOps, they should know Self hosted Agents and how to configure/manage them.
Github Organization Administration.
Docker - Configuring runners on docker containers.
Networking fundamentals.
Sonarqube Administration
**Jfrog Artifactory Administration. **
Terraform.
Troubleshooting errors in Ec2 instances and pipelines