I built the ATLAS Trigger and Data Acquisition System for CERN. AMA
Let's be clear that I took the physical printed circuit boards created by our lead engineer and purchased all the components and either hand-assembled them or supervised their assembly and testing. The actual team behind the software and schematics was an international collaboration of academics, however, the University of Illinois High Energy Physics Department was selected to physically manufacture the circuit boards in the late '90s.
20 physical boards were hand-carried to France, and each one was a labor of love that took almost two years. If I had been unable to complete this project, the project director would have either suffered a heart attack or the worst humiliation of his career. I was told that the project would have been delayed for around two years while another university was selected to build them. I also worked on the CDF-Muon upgrade for Fermi before it shut down.
ATLAS Level-1 hardware trigger description: https://atlas.cern/discover/detector/trigger-daq
Project manager: Dr. Steve Errede, who looks like a mad physicist but has a very impressive CV.
Please note that I have physical limitations in regards to vision, arthritis when typing, and trouble being able to see clearly and review what I've written. I've been using text to speech on a device that isn't trained and there's been a lot of errors. Please forgive these mistakes and don't make fun of me. English has always been my most difficult subject, orders of magnitude harder than science.
UPDATE: I will be keeping up with your questions for the next several days. I'm not going anywhere, oh wait, I am tomorrow going to a songwriter festival. But please know that even if I haven't responded, I have most assuredly read your question and I'm thinking about it and I plan on keeping this going until around the end of the month.