Vennium Software offers the best in CICD (Continuous Integration/Continuous Deployment), both deploying CICD software like Azure DevOps Server or Jenkins Server as well as implementing CICD pipelines using them.
Vennium has vast experience working CICD together with IaC like Terraform to create Infra As Code Piplines.
GitHub Actions can also be used for CICD.
Our founder did a significant amount of work on CICD at both Deloitte LLP and First Citizens Bancshares including IaC, Yaml based piplines, Deployment Pipelines and Octopus Deploy.
Check my GitHub repo for an example:
https://github.com/venniumSoftware/weekend_weather