Denis Rystsov is a software engineer working at Microsoft on Cosmos DB, globally distributed, multi-model database service. His area of experience lays in testing consistency models, consensus algorithms and distributed transactions. He likes to read CS papers and apply them in practice. Denis received his MSc in Applied Mathematics and Computer Science from SPbSU. Before joining Microsoft he worked on distributed systems at Yandex and Amazon. When he's not into research or coding he likes to go surfing, snowboarding or practice other balance-related activities.