"Our mission is to build an open, valuable, and skills-based credential for all engineers" - this is literally a copy of the other yc startup hackerrank. In fact their ceo said at a public event the skills-based credential will be called a hackerscore. Every developer will have a public hackerscore. Companies would pay for developers based on hackerscore. So like if your hackerscore was 1500 you would get offers for $150,000, if your hackerscore was 2000, you get the $200,000 offers, so on. Sort of like an SAT or GRE score. You could link your hackerscore to your hackernews account for more karma. Like if you made smart comments on hackernews your hackerscore would go up by a few points. If you solved more puzzles on hackerrank your hackerscore goes up. If you help more people on Stackoverflow your hackerscore goes up.
Are the triplebyte guys calling it hackerscore as well or is it triplerank or some such? I personally think the underlying motivation is sound but first you need to earn the trust of the community.