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A mobile developer owns the client side of a product on iOS and Android: the screens users tap through, the state that survives a backgrounded app, the network code that has to assume the connection just dropped, and the submission process that gets the binary onto the App Store and Play Store. The role exists because shipping one app to two platforms is rarely a job for two separate specialists. At Terminal, mobile hires are the engineers product teams reach for when a single engineer needs to ship the whole app across both stores without dropping platform fidelity.

Cross-platform versus native trade-off: The first architectural decision the engineer owns.

• React Native with the New Architecture (Fabric, TurboModules) when the team already lives in React and TypeScript

• Flutter with Dart when pixel-perfect custom UI and 60 fps animation matter more than web reuse

• Kotlin Multiplatform when the team has Android depth and wants to share business logic without compromising native UI

• Capacitor or Ionic when the product is a web app first and the mobile shell is a distribution channel, not the product

• Going fully native on Swift and Kotlin when the platform-specific UX or platform APIs justify the headcount cost

App lifecycle and platform integration: What the engineer owns that web developers never touch.

• Push notifications via APNs and FCM, including silent pushes, rich payloads, and delivery retry logic

• Deep linking and universal links that survive an app reinstall and route correctly from a cold start

• In-app purchases through StoreKit 2 and Google Play Billing, including subscription state reconciliation

• Biometric auth (Face ID, Touch ID, Android Biometric) with the secure enclave or Keystore backing it

• Background execution rules on both platforms, which differ enough to break a naive port

Offline and network resilience: Mobile networks fail. The app has to assume it.

• Local persistence with SQLite, Realm, WatermelonDB, or Core Data and Room on the native side

• Offline-first sync with conflict resolution, queued mutations, and replay on reconnect

• Optimistic UI patterns that recover gracefully when the server rejects the write

• Request batching, caching headers, and the cost of every byte on a cellular connection

App store submission and review: The work that gets the binary onto the device.

• App Store Connect and Play Console workflows, including TestFlight, Internal Testing, and staged rollouts

• App Tracking Transparency, Play Store data safety declarations, and privacy nutrition labels filled out correctly

• Build signing, provisioning profiles, and keystore management without locking out the rest of the team

• Review-failure recovery: knowing which rejections require an appeal and which require a build change

Common stacks worth knowing: Real-world mobile engineers usually go deep in one or two combinations.

• React Native with TypeScript, Expo or bare workflow, and TanStack Query for product teams shipping to both stores fast

• Flutter with Dart, Riverpod or Bloc, and a custom design system for animation-heavy apps

• Kotlin Multiplatform with Compose Multiplatform or native UI on each side when sharing logic but not UI

• Native iOS with Swift, SwiftUI, and Combine paired with native Android in Kotlin, Jetpack Compose, and coroutines

• Ionic or Capacitor with the team's existing web stack when the mobile app is a thin shell

The case for a mobile generalist is usually a team-shape argument. When the roadmap calls for one app on both platforms and the team cannot justify two specialists, hiring a cross-platform mobile engineer who owns iOS and Android end to end is the highest-leverage move. The case for a specialist shows up when platform-specific UX or platform APIs dominate the work.

One engineer, two platforms: When the team is too small to staff iOS and Android separately.

• Seed and Series A teams shipping a single consumer or B2B app to both stores

• Internal mobile tools where parity across platforms matters more than platform-native polish

• Companies adding a mobile presence to an existing web product without doubling mobile headcount

• Solo mobile owners on a small product team where the alternative is no mobile engineer at all

Cross-platform code reuse pays off: When the business logic dwarfs the platform-specific UI.

• Forms, data tables, list-detail flows, and content-heavy apps where 80% of the work is platform-agnostic

• Apps with a strong web counterpart that share API contracts, validation, and domain models

• Products iterating on feature velocity, where shipping once and deploying twice beats shipping twice

• Teams where TypeScript or Dart fluency is already on staff and the JavaScript or Dart tax is small

Mobile-specific concerns demand mobile-specific judgment: Web generalists do not own this surface area.

• Battery, memory, and CPU budgets that punish a sloppy render loop or an unbounded background task

• Device fragmentation across iPhone generations and dozens of Android OEMs, including the long tail of older OS versions

• Crash rate as a product KPI, with tooling (Crashlytics, Sentry, Bugsnag) integrated from day one

• App store review timelines that turn a one-line bug fix into a three-day release if the policy gets it wrong

AI Fluency multiplier: Agentic AI workflows have changed how mobile engineers ship code, and the gains compound on cross-platform work.

• An AI Enabled engineer running Cursor or Claude Code with human-in-the-loop review can port a feature from React Native to a Swift equivalent in a single session

• An AI Native engineer orchestrates parallel agents to land matching iOS and Android changes, their tests, and their store metadata updates in the same pull request

• On-device ML and AI features (Core ML, ML Kit, TensorFlow Lite, Apple Intelligence integrations) ship faster when the engineer treats agents as part of the workflow

• Terminal classifies every engineer in AI Assisted, AI Enabled, or AI Native tiers and surfaces those signals at hire time

When to hire a specialist instead: Cross-platform breaks down at the edges.

• Heavy use of platform-specific APIs (ARKit, HealthKit, CarPlay on iOS; Wear OS, Auto, Health Connect on Android)

• Pixel-perfect platform-native UX where users expect Human Interface Guidelines or Material 3 down to the animation curve

• Performance-sensitive apps (real-time video, AR, games) where cross-platform abstractions add unacceptable overhead

• Team scale where two specialists ship faster than one generalist juggling both platforms

A senior mobile developer's job description is broader than the job posting suggests, but the day-to-day is concrete. Here is what they actually own.

Feature delivery across both platforms: The default unit of work.

• Translate a Figma spec into a component tree, the state to drive it, and the data fetching that feeds it on iOS and Android

• Validate the feature on real devices, not just simulators, before merging

• Ship behind a feature flag (Statsig, LaunchDarkly, GrowthBook) and roll out by store version, not just user percentage

• Pair with the backend engineer on the API contract before writing the network layer, not after

Release engineering and store submissions: The work that turns a green main branch into a downloadable app.

• Fastlane, Xcode Cloud, EAS Build, or Bitrise pipelines that produce signed builds without manual steps

• Versioning discipline that keeps build numbers, semantic versions, and store metadata aligned

• Staged rollouts on Play Console, phased releases on App Store Connect, and the runbook for halting a bad release

• TestFlight and Internal Testing distribution to QA, product, and beta users before public rollout

Performance, battery, and crash discipline: The senior bar is debugging the slow frame or the background drain without guessing.

• Profile with Instruments on iOS, Android Studio Profiler on Android, or Flipper for React Native

• Track frame drops, ANRs, app-not-responding incidents, and cold-start time as product metrics

• Crash triage with Crashlytics, Sentry, or Bugsnag, with symbolication and source maps configured correctly

• Memory leak detection on long sessions and large lists, where mobile budgets are tightest

Platform integration work: The surface area only the mobile engineer owns.

• Push notification setup end to end: APNs and FCM credentials, payload design, deep-link routing, and delivery analytics

• In-app purchase integration including server-side receipt validation and subscription state reconciliation

• Permissions UX (camera, location, notifications, contacts) that respects platform conventions and survives an OS upgrade

• Biometric auth and secure storage that uses the secure enclave, Keystore, or platform credentials API correctly

Offline-first and network resilience: Mobile networks are unreliable by default. The app accounts for that from the start.

• Local cache strategy with SQLite, Realm, WatermelonDB, Core Data, or Room based on the data shape

• Sync engines that queue mutations offline, replay them on reconnect, and resolve conflicts predictably

• Retry, backoff, and circuit-breaker logic at the network boundary

• Loading, empty, and error states that handle a stalled request without freezing the UI

Build pipeline and tooling: Senior mobile engineers own the toolchain.

• Metro, Babel, or Hermes configuration for React Native; Gradle and CocoaPods for native dependencies; Dart build tooling for Flutter

• Type-safety and linting (TypeScript strict mode, SwiftLint, ktlint, Dart analyzer) tuned for the team

• CI checks that block regressions: type errors, lint violations, snapshot diffs, bundle size budgets

• Detox, Maestro, XCUITest, or Espresso for end-to-end coverage on the critical paths

Cross-team collaboration: A lot of the work happens outside the editor.

• Partner with designers on what is buildable inside the platform conventions and which interactions break on one OS

• Partner with backend engineers on API contracts, push payload shapes, and webhook flows

• Partner with product on scope, especially when an App Store review timeline reshapes the release plan

• Mentor junior engineers through code review, pair programming, and design system contributions

The skill bar separating a senior mobile developer from a generalist is depth in a few areas, not breadth across all of them. Terminal screens for both. Only the top 7% pass our screening, and the skills below are the ones that come up in technical interviews.

Cross-platform framework depth: Real production experience in a current cross-platform framework, not a tutorial-level walkthrough.

• React Native with the New Architecture, TurboModules, and the ecosystem around it (Expo, Reanimated, React Navigation, TanStack Query)

• Flutter with Dart 3, the widget tree at depth, and state management via Riverpod, Bloc, or Provider

• Kotlin Multiplatform with shared modules, expect/actual declarations, and Compose Multiplatform where it fits

• An opinion on when to drop down to native modules and when the cross-platform abstraction is enough

Native platform literacy: Cross-platform engineers still read and write native code when the framework runs out.

• Swift fluency including Swift Concurrency (async/await, actors), SwiftUI, and UIKit interop

• Kotlin fluency including coroutines, Flow, Jetpack Compose, and the Android lifecycle

• Comfort writing a native module or a platform channel to expose a Swift or Kotlin API to the cross-platform layer

• Reading platform release notes (WWDC, Google I/O) closely enough to anticipate breaking changes

Mobile-specific architecture: Patterns that web frameworks do not impose.

• Navigation models (stack, tab, modal) implemented correctly across deep links and cold starts

• State management that survives backgrounding, process death, and configuration changes

• Offline-first data layers with local persistence, sync, and conflict resolution

• Push notification handling end to end, including foreground, background, and tap-to-route behavior

Performance and observability: Knowing what to measure is as important as knowing how to optimize.

• Cold-start time, time-to-interactive, frame rate, and memory footprint tracked as product KPIs

• Profiling tools: Instruments, Android Studio Profiler, Flipper, Flutter DevTools

• Bundle size discipline including Hermes bytecode, app thinning, and on-demand resources

• Real User Monitoring with Sentry, Datadog, Firebase Performance, or comparable tools

Release engineering: Beyond writing code: getting the binary into users' hands safely.

• Fastlane, Xcode Cloud, EAS Build, Bitrise, or Codemagic configured to produce signed builds without manual steps

• App Store Connect and Play Console fluency including TestFlight, Internal Testing, staged rollouts, and phased releases

• Code signing, provisioning profiles, and keystore management without single points of failure

• Over-the-air update strategy via Expo Updates, CodePush, or framework-equivalent for non-binary fixes

Testing discipline: Knowing what to test is as important as knowing how.

• Unit tests for business logic in Jest, Vitest, XCTest, JUnit, or Dart test packages depending on the stack

• End-to-end tests for the critical user paths with Detox, Maestro, XCUITest, or Espresso, not every screen

• Snapshot testing where visual regression matters more than implementation detail

• Real-device testing on a representative matrix, not just the engineer's daily driver

AI Fluency: The capability shift that is reshaping engineering output.

• Daily use of Claude Code, Cursor, GitHub Copilot, or comparable AI coding assistants

• Comfort orchestrating agents for cross-platform refactors, test generation, and store metadata updates, with human-in-the-loop review

• Working knowledge of on-device ML and AI integration: Core ML, ML Kit, TensorFlow Lite, Apple Intelligence

• AI Enabled or AI Native tier per Terminal's standard. The engineer either uses AI tools to compound their output significantly, or builds agentic workflows directly

Soft skills that matter: The non-technical bar is real.

• Clear written communication. Most mobile work happens in pull requests, design reviews, and async threads

• Pragmatism on scope. Knowing when to ship and when to wait for the next release window

• Mentorship instinct. Senior engineers raise the floor of the whole team

• Patience with the platforms. App Store rejections and Play Console policy updates are part of the job