To maintain user experience integrity when facing developer feedback on a mobile app design, prioritize open communication. Understand their technical constraints, but advocate for core design principles that impact user experience. Provide clear rationale for design decisions, focusing on usability, accessibility, and user satisfaction. Collaborate to find solutions that balance user needs with development feasibility. If compromises are needed, ensure that they don't degrade the essential user journey. Regularly test the design, iterate based on feedback, and involve developers early in the design process to align expectations.

This kind of statement contributes to naturalizing an unhealthy relationship between Design and Development. Where the first, seems to have a superior position to drive the user experience decisions, and the latter is somehow trying to undermine it. Also, it assumes that the integrity of the user experience is a Designer job. But, these well-spread assumptions are the actual root issue here. There is no need to look for polite ways to deal with this specific matter. Instead, our duty should be to spread and remind the idea that the integrity of the user experience is everyone's job. This way we can remove ourselves from that "special position", to start building a more horizontal conversation around the user experience matters.

It's important to maintain perspective and take a step back by recapping the overall goals of the experience. With that as common ground, conversations between designers and developers become more about solutioning collaboratively, rather than compromising the experience.

I take a less traditional approach to this feedback. Designing a user experience isn’t just about building a solution; it involves business needs, technical limitations, and many other factors. As a designer, it's crucial to know your role and what’s outside of it. Once that’s clear, feedback becomes easier to understand—whether it’s about UX or technical improvements. Empathy should extend not just to users but to your team as well, once you understand where the feedback is coming from its a lot easier to approach it.

In handling developers' feedback to maintain UX integrity, clearly communicate the users' goals and collaboration. Support solutions that strike a balance between technical feasibility and user experience. Be flexible, but at the same time, make sure the compromise does not undermine key UX principles or usability. Regular testing and being able to explain why certain design decisions were taken keep both teams aligned.