If you want to improve the software engineering quality of bioinformatics software, then find an open source project you are interested in, and offer to submit patches to improve really unsexy but important stuff for bioinformatics user experience. Things like documentation, deployment, user interface, and testing. Some of these things require little domain knowledge but no one wants to do them.

Edited to add: some projects might even have a bug tracker that will already have problems you can tackle.