Show HN: Agentic interface for mainframes and COBOL

Hi HN, we’re Sai and Aayush, and we’re building Hypercubic (https://www.hypercubic.ai/). Today we’re launching Hopper, an agentic development environment for the mainframe.

Mainframes still run a surprising amount of critical infrastructure: banking, payments, insurance, airlines, government programs, logistics, and core operations at large institutions. Many of these systems are decades old, but they continue to process enormous transaction volumes