Legacy System: Billing system for large US telecom operator. Mission-critical application with high performance requirements.
As-is State: Batch application with 5M+ COBOL LOC and 4000 JCL procedures, leveraging CICS, DB2, and Syncsort. The system has evolved over 30+ years and was maintained by several different vendors. It supports several architectural variants that are no longer in use.
Target State: Linux server cluster with 4 128-core servers with 1TB memory each, DB2 database, standard Linux services.