Thanks to everyone here who took a chance on us in the beginning and shared helpful feedback over the years! How to serve startups/developers more effectively at scale is still the main thrust of our product focus. We've fixed and improved a lot of things since we launched here in 2011, but we also still have a lot of work to do. (Both "obvious things we want to fix" and "new functionality we want to build".) I always appreciate hearing from HN users (even if I don't always have time to respond): patrick@stripe.com.
For anyone thinking about what they should work on: I started building developer tools when I was 15 and "tools for creation" is still, IMO, one of the most interesting areas to work in.