The interview process is long and it's meant to be that way. They are a smaller business and ensuring a good fit all around is something of value to them.
It's best to continue to follow up with each step of the interview process/send thank you notes after interviews. If this is not your personal style (sending thank you notes and communicating interest in the job post-conversations), this is probably not the company for you.
HumCappers thrive on communicating with each other, as the teams (and company) are small in scale, but growing. There are lots of upward mobility opportunities if you get in quickly and show you can thrive in the environment!
I recommend getting in touch with a recruiter there to see how to get ahead in the process, and express interest in the company, and you'll be good to go!
The interview process is easy going and conversational, it's best to be honest about your career goals and intentions, and talk about salary expectations. Don't be afraid to ask questions, and bring a list ahead of time.