He's working on linux. But he have got dual boot installation on his computer with windows to run photoshop, with only purpose of reading .psd file sent by designer, when they use this format.
For know the best solution we found is to use the .svg export of Affinity, then he could read every data he need with Inkscape. An other solution is to simply buy him a Affinity licence, it's not very expensive
But I'm not looking for a specific solution, I'm mainly curious about how do people when working with developper without an Affinity licence, if there is some prototyping tool we can use (like Invision, Avocode, Figma, etc), or whatever.