From the website:

SteamStreet exists to provide the best tools for passionate individual investors to manage and discuss their portfolios. Right now, that means improving the portfolio management workflow, providing better visibility into portfolio performance, and allowing investors to share their insights and actions with others. SteamStreet is based in, well, nowhere! Developers are spread out all over the world. And instead of hiring jack of all trades employees, we seek out the best and the brightest experts to help us out short term and part time. We take advantage of the broad range of online services available, keeping our costs extremely low, and providing us with the flexibility to move quickly.