Egor Kovalchuk, a deployment manager at MegaFon, one of Russia's leading telecommunications companies, discusses the company's digital transformation journey facilitated by Couchbase Server, a NoSQL database. MegaFon leverages Couchbase for its high performance and flexibility in managing large-scale data processes, including simple and write-through caching, which has notably reduced service reinstatement times for prepaid accounts from 90 to 30 seconds. The database's key-value storage, JSON data format, and high availability features like intra-cluster data replication are crucial for meeting MegaFon's performance requirements, such as processing up to 200,000 requests per second with minimal latency. The use of Couchbase has enabled horizontal scaling, enhanced information security, and simplified upgrades, contributing to cost reduction and improved customer satisfaction. Challenges faced during upgrades, like issues with views and compaction in older versions, have been addressed in newer versions, highlighting the platform's adaptability to evolving business needs. Overall, Couchbase's robust architecture and scalability make it a preferred choice for MegaFon's dynamic and extensive telecommunication operations.