I had a lot more fun with that than I expected great work! I found my finger maneuvers not crisp enough to do anything with real detail.
One idea I immediately had was to use a key on the keyboard (if not on mobile of course) as triggers for draw, hover, erase, etc. You could also control different colors that way, possibly even draw generated shapes like circles and rectangles (press 'c' to start a circle, then use your finger to drag out the size, stop with 'c' again).
and if you want to get really advanced, allow rotation of the drawn object and then choose a new plane to draw on.
I think it depends largely on the market you're in. In a rural area (or something far enough away from a large city) and may not have a lot of supply of software developers: credentials likely don't come into play as much. Raw experience may suffice.
But more populated areas will mean larger talent pools. Unless you're in a tech hub or a fast growing mid-size city, the amount of software jobs might not serve the pool. Credentials will matter more.
Practically speaking :)