Ask HN: Equity percentage for NonTechnical CoFounder for high tech startup?

Curious what peoples opinions are on how to split equity given the following circumstances:

1. Product beginning to gain traction relatively easy, not a problem getting some users (B2B). Not much effort put in/no focus on user growth yet.

2. One year+ of highly technical development work done after work/weekends.

3. No marketing/technical docs/customer onboarding/sales etc.

4. Future work is extremely technical, but lots of working with customers will be needed.

5. No VC funding/very little revenue.

So basically all of the "company" is code. How do you bring someone onboard in this circumstance? Seems silly to give them huge equity, but it's very early, early enough its hard to imagine someone good joining for small equity.