After working in financial infrastructure at SIer and game platform development elsewhere, Hironobu Ueno founded double jump.tokyo in April 2018.

Ueno developed My Crypto Heroes, a blockchain game that achieved record transaction amount, volume, and DAU on Ethereum. Using his NFT sales/operational knowledge, he developed NFTPlus, a service to support blockchain games and NFT content, and N Suite, enterprise NFT management SaaS. In order to further improve the UX of blockchain games, he was involved in establishing and developing Oasys, a blockchain specifically for games.