I've applied as a Software Engineer at a company and been interviewed. The initial interview with the employer was good. The next step for the application process was to be interviewed by a technical lead developer. The technical lead asked me to show some sample outputs of my work but I can't show my sample output because the outputs I've done is ONLY for use inside of my past company and its very confidential.
Note that in my past company. Flash Drives are prohibited and uploading is monitored. That's is why I cant really copy my work outside the company.
I've spoken with the technical lead and I said that I can't give the sample output because of its confidentiality. In return the technical lead just thanked me for my time and they said they'll contact me soon. Which I haven't got a callback for two months.
Given the situation. What could I have done to make them to prove that I have done this and that project?