I have worked on both redesigning print magazine features for tablet/mobile devices myself, and working with a global team at Apple to create templates that sit within brand specifications to slot features into each week. Below are some examples of both.
Sketch project - 'Spendo'
As part of an online Sketch course that I undertook, I created a project for a fictitious new expenses company. This included responsive mobile app pages as well as as a high-fidelity web landing page.
The design process for the mobile app started with wireframes, which I have included next to the high-fidelity version of each page. I then moved on to designing a web landing page, using a combination of elements from Sketch App Sources website and icons and symbols I created myself.