I spent the bulk of the first 8.5 years of my career in and around JPL’s Spacecraft Assembly Facility (SAF), Test Engineering Lab (TEL), Assembly, Test, and Launch Operations (ATLO), aka, Building 179.
A lot of software systems in Operations a little more than 10 years ago were (Open?)Motif on Solaris. I remember helping a colleague transition to Qt when Motif’s event system just couldn’t handle an extra 30 data streams we were projecting for use by Mars Science Lander. It was something like a 30 minute demo of Qt Designer (with Hal, the software engineer actually tasked) and him giving up a weekend to full replace all the Motif code. The codebase had shrunk by more than half, all 30 additional data streams had been added, and the Ops Engineers reported that the app was noticeably snappier even with the new streams.