How Engineering Managers and Platform Leads Align to Scale Mobile Developer Experience Mobile developer productivity is often slowed not by a lack of technical ideas, but by a gap between the people responsible for platform health and those accountable for delivery. Platform Leads see rising build times, unreliable CI, fragmented architecture and growing technical debt. Engineering Managers see roadmap commitments, capacity constraints, operational risk and pressure to deliver customer value. Both perspectives are valid, but when they are not connected, developer friction accumulates and platform improvements struggle to gain investment. In this joint practitioner talk, an Engineering Manager and a Mobile Platform Lead share a practical operating model for turning mobile Developer Experience from a technical concern into a measurable leadership priority. We show how to combine build and CI telemetry, pull-request flow, architecture health and developer feedback to identify the friction that materially affects engineering capacity and delivery predictability. We then demonstrate how to translate that evidence into a credible investment narrative without overstating productivity gains or reducing DevEx to a single metric. Using a realistic tier-1 enterprise mobile scenario, we explain how the two roles jointly prioritize platform work alongside product commitments, introduce automated guardrails for linting, module boundaries, dependencies and CI quality, and maintain proportionate security and governance controls. Attendees will leave with a reusable framework for defining meaningful DevEx measures, framing platform improvements in business terms, and establishing clear decision rights between Engineering Managers and Platform Leads.