Sander Berents has been fascinated by astronomy since childhood when he started using his older brother’s telescope. In his teens, he also became immersed in BASIC and assembly language programming with his TRS-80. Later, he earned an M.S. in astrophysics. His earliest jobs involved computer programming, and nowadays, he’s an independent, professional macOS software developer and the developer of the macOS app called Observatory. Version 1.0 was released in April 2016. We chatted about the development of Observatory, written in Objective-C and C++, which has several important features for astrophotographers: plate solving, image stacking and a digital blink microscope used for discovery. This app can also be used as a non-destructive photo library for astrophotos. Sander chatted about life as a developer and explained a little bit about how astronomers use his app.