For startups, Convex's funding situation is sort of as good as it gets including the strongest angels in the valley, a tier 1 leading the A, a large round etc. You're pretty safe on that front
Just to complete the picture (Convex CEO here), fundamentally changing how software is made is a long journey, and so we've worked hard to find investors that are in this for the long haul and who believe in the vision. We've been very fortunate to have built relationships with numerous top-tier investors who are excited about what we're doing (such as @casado of a16z, who is on our board), and so we're in an unusually good spot with financing. But this is an important question to ask a startup whose service may play a key role in your software project–so thanks for asking it!