I built a toolkit to automate instrumentation and collection of line coverage data from unit/integration tests. It eliminated the need for an entire team's job

I built a toolkit to automate instrumentation and collection of line coverage data from unit/integration tests. It eliminated the need for an entire team's job (the one I had been managing). They were re-assigned and my client dropped me for someone half my rate. It was a great feeling to create that automation that directly saved money but a little bitter-sweet when robots replaced people's jobs, including mine :)