I had a similar feeling at my last job: I'm building software no one uses :( I made sure to probe about related details when I was looking for my next (current

I had a similar feeling at my last job: I'm building software no one uses :( I made sure to probe about related details when I was looking for my next (current) job. I found a company with a strong customer relationship, existing production software running, and more in the pipeline. Things worked out well and I got to be happy about seeing my code running in production, helping people do "stuff". My one piece of advice is to focus on this aspect during interviews whenever you decide it's time to move on. After a certain dollar amount, optimizing things like this that you value will likely lead to a happier result compared with a bigger paycheck.