Platform engineering is the discipline of designing and building toolchains and workflows that enable self-service capabilities for software engineering organizations in the cloud-native era.

Platform Engineering

I worked closely with the team that created this platform and also used tsuru for a long time in my previous company.

Do you still recommend it?  There's a lot parts that look like they need updating that make me think the project is winding down

It is possible, currently I can't say. I can introduce you to one of the project collaborators.