Funding Gates has a more in depth hiring process than most other companies. They are thorough and because they are in the early stages, they want to get the right people into key roles.
They really want to get to know you and management values team input so you will likely interview with other team members.
You may have to do a small task so that they can see your skills in action. Management will meet with you to discuss your work when you've completed it. It took time, but it wasn't too difficult. I found it was a good opportunity to get a sense of what it would be like to work with them.