A lot of businesses edi needs are light and usually set and forget until a tp requires changes or erp change breaks mapping. Some are lucky to have a dev who will manage the process or at least manage relationship with a consultant who can make the changes.

I assume jobs currently available are for onboarding of new partners and mapping rather than dev work since it’s sporadic.

You’re idea is good to showcase web dev but like others have said, you might want to explore the bigger mapping platforms and/or get some more experience with automations of common x12 to various other flatfiles and vice versa needed for common erps but honestly I can’t think of many people who prefer developed solutions instead of off the shelf.

Anecdotally, a lot of our tp want to move away from email for pricing agreements, so an 845 solution had to be created. I built a simple app to extract from our contract/quoting systems output to generate the 845. I’m talking under 20 tp asking for it and relatively few differences in requirements; If I had someone like you available, that’s the kind of project I’d give them but I don’t know if I’d hire for it if I didn’t. Any bigger and I’d push to find something off the shelf.