Scientist

Defect-free software does not exist.

Most of the effort in the software business goes into the maintenance of code that already exists.

However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions.

This will surprise some of your readers, but my primary interest is not with computer security. I am primarily interested in writing software that works as intended.