Why shouldn't I try to hire a 'DevOps Engineer'?
TL;DR: You should never try to hire a DevOps Team



There are essentially three most common roles to hire for:


DevOps Architect / Evangelist
DevOps Engineer
CI/CD Engineer


These roles are distinct from your 6 essential software development roles that traditionally compose the software engineering organization:


Product Management
Software Development
Tools Development
Security and Compliance
Quality and Testing
System Operations (SRE)


Lets go through the three roles one by one and see how they fit



DevOps Architect or Evangelist


Why: If you are lost, slow, broken and don't know what to do.
When: At the start of the process in planing stages.
What: Management level role to guide all managers and leads in the entire Software Engineering org. This person will plan the entire transformation of your engineering organization to a highly functioning state.
Who: Consulting member well versed in theory, management practices, culture topics and operations who reports directly to VP of Software Engineering. 


In some cases and for smaller and mid-sized companies you might start the process instead with hiring a consulting organization, like DORA.

DevOps Engineer


Why: 


To bridge the gaps between teams if they are organized along the functional roles mentioned above to ensure cross functional level cooperation. 
To embed with product oriented teams, which have each of the 6 traditional roles included in the team, to help bridge the knowledge gaps and to help with implementation and adoption of the novel practices and tools.

When: Once you've laid out your plans and the organizational transformation starts and the entire management team is on board.
What: Enable cross function cooperation, ensure that team boundaries are broken down, that local optimizations inside teams are not creating a barrier to high throughput of work throughout the value chains all the way from customer wishes to customer deliveries.
Who: Experienced engineer with skills both in software development and system operations. He should be skilled in the best practices, process and culture changes related to DevOps transformation.


CI/CD Engineer


Why: To help implement CI/CD pipelines, integrate your tool chain, bring in the tools that will enable better working of the company.
When: During the transition in larger organization, while the above roles have been already filled.
What: Engineer, which is essentially part of the tools team that will be able to setup CI/CD pipelines and start integrating internal systems in a way that will remove friction from the throughput of work.
Who: Engineer experienced with Tools, Integration process, Release Management and DevOps practices. Someone who understands they are replacing human gating in release process by Automation.