I never got into anything like that. I cut my teeth on DOS and Windows 3.1. Then NT4 and win 2k workstation. Our maintenance software came with the equipment and was proprietary to that equipment. It's all equipment used in civil aviation here in Canada. Radar, Instrument Landing Systems, radio navigation and communications etc. All the ground based equipment an aircraft would use for navigation and communications. I did some basic circuit board design and fabrication but I never did any programing or code writing.