Safety critical software is absolutely not the thing to get involved with (especially off the bat)... That and security critical software have mountains of approval to get through before they can be used. The FAA is notoriously old fashioned.

Also, I'd personally hate to be responsible for some crash because my flight planning assistance SaaS had a minor, off-by-one bug in it somewhere, or misinterpreted "thar be tornadoes" for "light and variable winds".

(I am an embedded software engineer. I was also a private/instrument pilot.)