[taco-hands]

There's a lot of chaff in the comments, but put bluntly - you aren't going to find a good tech co-founder randomly, online or through some hypothetically attractive matching services...

Matching services are weak at best and should be treated like online dating sites; The vast majority aren't those you're looking for and frankly, some of them are bunny-boilers.

If you're serious - use and exploit your own network, reach out to people you know and discover those who others value and might be interested in your hypothetical (or proven idea) backed by data, science, experience and value.

I say this having experience co-founding multiple businesses; 1 IPO on LSE/NASDAQ, several trade sales and a bunch of failures (which really really hurt). The most valuable lesson being that the failures teach you more than anything else!