Case Study: Leading European Energy Provider achieves 30% faster application understanding and a six-week modernization plan with CAST Imaging (delivered by Persistent)

Persistent slashes time in building modernization plan for leading energy provider’s key application

A leading European energy provider focused on reducing greenhouse gas emissions and making energy reliable, affordable, and sustainable needed a new partner to sustain and modernize a mission‑critical monolithic application. The codebase spanned seven million lines across JavaScript, Python, Ruby and C#, backed by Oracle and SQL Server, and required a low‑risk, fast ramp‑up with expertise in modernization and sustainability to future‑proof the platform.

Persistent used its ExtenSURE engineering framework with CAST Imaging to automatically map the application, produce a Software Bill of Materials, and reveal architecture, dependencies and improvement areas. In six weeks the team delivered a fact‑based modernization plan and persona‑specific knowledge base (saving ~30% of the time to understand the app), enabled a rapid vendor transition with minimal technical transfer, and secured a multi‑year engagement for development, modernization and R&D.