Good question but it is like asking "How long is a piece of string" ? You need to provide more specifics to get more meaningful answers. "Cloud Infra and Deploy

Good question but it is like asking "How long is a piece of string" ? You need to provide more specifics to get more meaningful answers. "Cloud Infra and Deployment" could literally mean 100s of things depending on your requirements, tech stack, customer needs, traffic levels, workload types (consistent vs sudden bursts), database read/write requirements and many other factors. Having said that, most of us generally use an existing PaaS or IaaS built on top of the biggest providers like AWS, DO, GCP, Azure etc. Some people use things like Terraform or Ansible Scripts or even plain old bash scripts or Makefile. Whether you should use Kubernetes or not again depends on answers to the questions from my 1st paragraph.