While at Readz, I have been given the responsibilities of the UX / UI Designer position on top of my old responsibilities. Most of the work involves quick mockups and fixes to satisfy customer issues and increase efficiency with the Readz platform. For these I just take screenshots of the current product and then make changes on top of it, following the same general style and leaving notes if things are completely new. I post the screenshots to their github issue and meet with developers and higher-ups, make any needed changes, then supply more exact measurements, and assets. After that, fine-tuning usually occurs with the developer and I sitting at the same computer.
External Link Iframe Bar Redesign
Guides Functionality in Readz Editor
Adding Copy/Paste Template Capabilities to Themes Tab