I have similar experience. I've been doing algo trading for a decade, but out of interest I came up with a side project. It's a web service that uses django, with phone apps written for Android and iOS.

There's a certain trepidation to learning a new stack, but if you've done one you can do another.

I dabble in a bunch of stuff too, but those are different enough skillsets that I'd wonder about a guy claiming equal expertise in both.

Yes, an algo-trader in the financial hotbed of... Denver.

Not to mention senior PHP is junior anything else.