Amit Kumar Tyagi describes modernizing the zTPF mainframe not as an escape from legacy systems, but as a disciplined translation of their unmatched reliability into cloud-native, AI-enabled architectures. By using Generative AI to deconstruct decades-old code and applying patterns like strangler migrations, his team preserves mission-critical stability while unlocking agility and faster innovation. Tyagi argues that true success lies beyond migration itself—measured instead by cultural alignment, accelerated time-to-market, and an organization’s ability to continuously reinvent at scale.