What KPIs would you look at to evaluate the success of a technical PMM program?

Great question that's very top of mind!

The broader GTM organization will own the growth targets, while the broader Product organization will own the adoption targets. I believe where tech PMM can make the most impact on both sides of the house is with velocity targets. On the GTM side, that's things like sales cycle velocity. On the product side of the house, that's things like onboarding velocity. The content that gets created by tech PMMs should be an accelerator, so the KPIs should match accordingly. 

This should be aligned with the key responsibilities of the role (see previous answer), but here are some sample KPIs:

• Improvement in head-to-head win rate against a key competitor: typically for opportunities that progress to late-stage
• Enablement / compentency metric: e.g. Send a survey around what % of the SE team feels confident to conduct a demo, around a newly launched product or major feature. Measure before and after enablement delivered results.