Sounds like you might want an SRE lead / Platform owner.

in my experience it is still too early in the game to thin slice roles like this.

It makes sense to have broad buckets like:

  - mobile (ios, android)
  - frontend / backend (web or fullstack)
  - SRE
  - Security and compliance
  - AI / machine learning

this is how i might tag tickets. but small teams probably have to share responsibilities until there are enough resources to focus