I built software to track our traders. This was at one of the largest investment banks in the world and at the time they had a rudimentary system for tracking and recording their in-house traders activities - orders, trades, and other order/trade related information. At the time, the rudimentary system was built mostly to comply with government regulations, and was later modified by someone else to capture and report a larger scope of information about the traders to a higher-up department.

My system was built entirely from scratch because the existing system was antiquated, poorly structured, and really not conducive to future expansions.

After testing and implementing my system, a handful of traders lost their jobs as a result. One criteria often looked at was their number and reasons for failure to delivers (FTD's).

Other than that, it's mostly automating things that I almost sort of regret. A lot of folks in the bank were fired after I wrote a series of apps that could do the work they do. Mostly repetitive tasks. Still feel bad about that but if I didn't do it, they would have hired someone else and at the time I was really, really in dire need for a paycheck.