You worked with bond math -- that's what goes on the resume. It doesn't matter a lot whether it was a custom DSL or a custom library in a common language. Nob

You worked with bond math -- that's what goes on the resume. It doesn't matter a lot whether it was a custom DSL or a custom library in a common language. Nobody trusts your resume anyway. It just has to start the conversation in the right direction. Whether it's good for the organization is situational. Wherever you go, new hires have to learn the codebase before they can be really effective. It helps if it uses common tools and languages, but it also helps if it is well-factored. If using a custom DSL results in much better-factored code, it can be a net win. There are so many languages out there. It's hard to get a job by leveraging your skill in the small subset you know without passing up a lot of opportunities involving the ones you don't.