In most cases, growth results in new challenges. Sometimes, these challenges can mean new levels of complexity with processes, people, and funding. However, just because a business is experiencing growth, does not mean things need to start getting complicated.
One of the best ways to maintain the "founder's mentality" when noticing growth in an organization is to hire the correct people. Seek candidates from great companies who tend to shy away from complete bureaucracy. Remember, this doesn't mean a complete disregard for using systems. Instead, create systems to support people without overriding them.
To read more about avoiding complication when growing your business, check out the full article by Scott Leibs on Inc.com.