BlockFi, a U.S.-based crypto financial services company, has made two senior appointments. Alexander Grigoryan has joined as the chief technology officer and will oversee all global product development and technology strategy. Prior to BlockFi, Grigoryan led product engineering at Skillz, a mobile games platform, and before that held senior engineering and developer roles at Walmart and PayPal. Deborah Barta joins as chief operating officer, a newly created role. She was previously at Mastercard.