Microsoft announced the end of Visual Studio LightSwitch in October 2016. The applications it produced still run, but the tooling is gone, so nobody can change them. The only people who can make sense of what it generated are the ones who built with LightSwitch when it was alive, and there are not many of them left to hire.
I built four production systems on LightSwitch, for payroll, used-car wholesale, right-of-way appraisal and a food plant, and I have moved off it. Your data and your business rules survive; the generated screens are what get replaced, one at a time, on a stack you can hire for at normal rates.
Your Silverlight application has no browser left to run in, and the people who built it have gone.
Delphi is alive. The one person who can read your Delphi 5 program is not on staff.
FoxPro. Yes, still. And the business still depends on it.
Your records are in Notes databases. Getting them out without losing them is the job.