I struggled with this for years, until Apple released the iPad Pro with tandem OLED and nano-textured glass. With that I could comfortably program outside, even

I struggled with this for years, until Apple released the iPad Pro with tandem OLED and nano-textured glass. With that I could comfortably program outside, even in direct sunlight. The only issue has been when too much sun hits the iPad for too long and forces it to shutdown. But usually in that case I'm also too hot so it's not too much of a bother to find shade. Now, with the MacBook Pro w/ nano texture display and the Vivid program to increase brightness, I can have a dual display setup outside using the MBP and iPad. It's an expensive setup if your employer isn't paying for it, but it works very well.