Developer experience is hard to quantify, and is not a simple as correlating with subjective input of "how devs feel." SPACE and DORA are attempts to get objective about engineering productivity. Some teams prefer to use a more subjective approach here as well. There aren't any great answers for equivalents in developer experience, yet.
There are some obvious "tooling" considerations that impact developer experience. For the most part, these are related to how much devs can "self-service" the various parts of the SDLC, and how good the user experience of that service flow is. For teams that want to get a great experience without reinventing the wheel, internal developer platforms like what we're building at Coherence (withcoherence.com) are a great answer.
There are some obvious "tooling" considerations that impact developer experience. For the most part, these are related to how much devs can "self-service" the various parts of the SDLC, and how good the user experience of that service flow is. For teams that want to get a great experience without reinventing the wheel, internal developer platforms like what we're building at Coherence (withcoherence.com) are a great answer.
We've also got a free 1-minute PR velocity scorecard that you can try: https://www.withcoherence.com/post/measure-your-pr-efficienc...