Mobile App Developer (iOS / Android) Cover Letter Examples & Writing Guide

Dear Hiring Manager, I am writing to express my strong interest in the Senior iOS Developer position at Apple. With 7 years of experience building native iOS applications and deep expertise in Swift and SwiftUI, I am excited to contribute to creating the world's most beloved mobile experiences. In my current role as Lead iOS Engineer at Uber, I have successfully: • Developed core features for iOS app with 50M+ downloads using Swift and UIKit • Migrated legacy Objective-C codebase to modern Swift and SwiftUI • Implemented real-time location tracking and mapping using MapKit and Core Location • Built offline-first architecture using Core Data and local caching strategies • Optimized app performance reducing crash rate from 2% to 0.1% • Mentored 6 iOS developers in Swift best practices and iOS design patterns Apple's commitment to creating magical user experiences through seamless hardware-software integration inspires me. I am particularly excited about working on next-generation iOS features. I would welcome the opportunity to discuss how my iOS expertise can contribute to Apple's mobile platform. Sincerely, Michael Zhang

Dear Hiring Team, I am excited to apply for the Senior Android Developer position at Google. With 6 years of experience building Android applications and expertise in Kotlin and Jetpack Compose, I am eager to help billions of users through Android. At Meta, I have developed Android features including: • Built Instagram Android app features using Kotlin, Jetpack Compose, and MVVM architecture • Implemented camera and image processing using CameraX and ML Kit • Designed offline-first sync using Room database and WorkManager • Optimized app size reducing APK from 50MB to 30MB through code splitting and ProGuard • Implemented push notifications using Firebase Cloud Messaging • Achieved 4.5+ star rating with 1M+ reviews through performance optimization Google's leadership in mobile innovation and Android ecosystem inspire me. I am particularly excited about working on Android platform features and Google apps. I look forward to discussing how my Android expertise can contribute to Google's mobile vision. Best regards, Jennifer Chen

Dear Hiring Manager, I am thrilled to apply for the Mobile Developer position at Airbnb. With 5 years of experience building cross-platform mobile apps using React Native, I am excited to help create seamless experiences for hosts and guests. In my role as Senior Mobile Engineer at Shopify, I have: • Built e-commerce mobile app using React Native serving 5M+ merchants • Implemented native modules in Swift/Kotlin for platform-specific features • Designed component library shared across iOS and Android platforms • Built offline mode supporting order management without internet connectivity • Optimized JavaScript bundle size and startup time for faster app launch • Integrated native payment SDKs including Apple Pay and Google Pay Airbnb's mission to create a world where anyone can belong anywhere inspires me. I am particularly excited about working on Airbnb's mobile-first booking experience. I would welcome the opportunity to discuss how my React Native expertise can enhance Airbnb's mobile apps. Sincerely, David Park

Dear Hiring Team, I am writing to apply for the Mobile Developer position at Spotify. With 6 years of experience building media applications for iOS and Android, I am eager to help millions discover and enjoy music. At Apple Music, I have built mobile features including: • Developed music player with offline playback and background audio • Implemented audio streaming with adaptive bitrate and caching • Built social features including playlist sharing and collaborative playlists • Designed personalization algorithms for music recommendations • Created custom UI animations and transitions for delightful user experience • Optimized battery usage reducing power consumption by 40% Spotify's mission to unlock the potential of human creativity and leadership in music streaming inspire me. I am particularly excited about working on Spotify's discovery and recommendation features. I look forward to discussing how my music app expertise can contribute to Spotify's mobile experience. Best regards, Sarah Martinez

Dear Hiring Manager, I am excited to apply for the Mobile Developer position on Stripe's Mobile SDK team. With 5 years of experience building iOS and Android SDKs, I am eager to help developers integrate payments seamlessly. At Square, I have developed mobile SDK features including: • Built payment SDK for iOS (Swift) and Android (Kotlin) used by 100K+ developers • Implemented card scanning using on-device ML and computer vision • Designed API interfaces following platform conventions and best practices • Created sample apps and comprehensive documentation for SDK integration • Built automated testing framework with 90%+ code coverage • Ensured PCI DSS compliance for secure payment processing Stripe's mission to increase the GDP of the internet and focus on developer experience deeply resonate with me. I am particularly excited about working on Stripe's mobile payment SDK. I would welcome the opportunity to discuss how my SDK development expertise can help Stripe developers. Sincerely, Robert Kim

Dear Hiring Team, I am writing to express my interest in the Mobile Developer position at Discord. With 4 years of experience building Flutter applications, I am excited to help communities connect through voice, video, and text. At Twitch, I have built mobile features including: • Developed live streaming mobile app using Flutter and Dart • Implemented real-time chat using WebSockets and stream controllers • Built video player with custom controls and adaptive streaming • Designed state management architecture using Bloc pattern • Created custom widgets and animations for platform-specific feel • Achieved 60fps performance through profiling and optimization Discord's mission to create space for everyone to find belonging and commitment to community inspire me. I am particularly excited about working on Discord's mobile chat and voice features. I look forward to discussing how my Flutter expertise can enhance Discord's mobile experience. Best regards, Lisa Rodriguez

Dear Hiring Manager, I am excited to apply for the Entry-Level Mobile Developer position at DoorDash. As a recent graduate with a B.S. in Computer Science from Stanford University and internship experience in iOS development, I am eager to help local economies thrive. During my internship at Uber Eats and personal projects, I have: • Built iOS food delivery app using Swift, SwiftUI, and Combine framework • Implemented real-time order tracking using MapKit and push notifications • Designed restaurant browsing interface with infinite scrolling and caching • Created shopping cart and checkout flow with payment integration • Built unit and UI tests using XCTest with 80%+ code coverage • Learned mobile app architecture patterns including MVVM and Clean Architecture My academic coursework included mobile development, UI/UX design, databases, and distributed systems. I am passionate about building delightful mobile experiences. DoorDash's mission to empower local economies and commitment to logistics innovation inspire me. I am particularly excited about learning from experienced mobile engineers and contributing to DoorDash's platform. I would welcome the opportunity to discuss how my mobile development skills and enthusiasm can contribute to DoorDash's team. Sincerely, Alex Thompson