Nat Wallen founded Referral Building Real Estate SAAS after working as a real estate agent for over 20 years and only retaining 12% of customers after 2 years due to a lack of referral system. The software provides agents with four tools in one platform to generate referrals from past customers, engage homeowners, build their vendor network, and manage their sales pipeline. It utilizes a recurring $69 per month subscription model and is targeting the 3.4 million real estate agents in the US and Canada for its initial market. Financial projections estimate $5.9 million in revenue after 2 years with 10,700 subscriptions.