Comment by leonidasrup

Network engineers and TCP/IP stack implementers have pretty good understanding of how the Internet works.

But I have see quite terrible finance software, patches over patches hold together by a duct tape. Also finance software has to implement large complexity of tax law, which is very large and always changing. It also doesn't help if the company developing finance software sees software development as a cost center and wants always to push the costs down (especially short term costs).