In 2010, Cremades founded with Tanya Prive, the investment crowdfunding platform for startups RockThePost. After one year of development they were able to launch the platform to the public on November 23, 2011. In less than a year, the platform was already mentioned by TIME as one of the best crowdfunding platforms in the world, as one of the top 10 digital tools for entrepreneurs by Forbes and as one of the hottest startups to watch by Business Insider.
Cremades joined officially as CEO of RockThePost on May 1, 2012. Prior to RockThePost, Cremades worked as a lawyer at King & Spalding where he was involved in one of the biggest investment arbitration cases in history which was Chevron v. Ecuador ($113 billion at stake).