Hello, I am Jongyeol Choi, a member of the Redis team at LINE. LINE’s services use various storage systems based on their needs. Our messaging service uses various open source storage systems such as Redis, HBase, and Kafka. As a member of the Redis team, I participated the RedisConf18 conference in San Francisco in U.S.A, on April 26th, as a speaker. The topic of my session was, “Redis at LINE, 25 billion messages per day”. I’d like to take this opportunity to share the presentation preparation process, the conference itself and the responses I got for my session.