Not my area of expertise but I'll hazard a guess: They properly fund theirs and take the advice of industry experts?
Please take time to read the report I linked to earlier - probably not best to guess if it is not your area of expertise. The system Ryanair use is shared by many airlines and ticket reservation systems.
As can be seen in the report, Ryanair do better than most of the legacy and full fare carriers in terms of website uptime.
There are plenty of opportunities to bash Ryanair - but this is not one
