If you have a small start-up company with 1-15 employees you probably don't need a full-time person to handle your DevOps related tasks. I help you set up the CI/CD system, introduce the test automation and the cloud usage in a single project or step-by-step as your company growth. When you reach the point that you need someone to handle these task I'll happily hand-it of to whoever you have hired.

If you work at a mid-sized start-up company (15-100) employees you probably already have some of the processes in place and you provbably already have a team of people (that might be a team of 1) to handle these task. However you might want to improve your CI/CD system or introduce new techniques. Hiring a full-time employee might be the right long-term solution, but for the short term you might want to have someone who can come in and help your team with DevOps related tasks.