The Devs office is mentioned as being inside a lead Faraday cage. A Faraday cage must be conductive and lead is not.
One of the first things first responders to Sergei's immolation would have done is put up a privacy screen around the body. Lily would not have been able to see him just lying in the open hours later.
The devs room would need power, HVAC, sewage and water hook-ups but none of these are possible. While you might get away with making the staff carry water in and sewage out the power and HVAC just aren't solvable. Aside from the workers and their equipment quantum computers require a large amount of power for cooling and that in turn generates heat you need to get rid of and which won't pass through a vacuum.
Lily is a software engineer working in encryption (and she's seemingly quite good at her job) yet she desperately seeks Jamie to crack the Sudoku password on Sergei's phone when Sergei goes missing without even giving it a shot herself.