• Languages:
• Java: Used for backward compatibility and integration with legacy Android SDKs and enterprise-grade libraries.
• Kotlin: JetBrains-developed, Google-endorsed modern language for Android with null safety, coroutines, DSL support, and Jetpack Compose compatibility.
• Toolchains:
• Android Studio (Gradle-based builds), ADB, ProGuard for obfuscation, Lint, LintVital.

• Languages:
• Swift: Modern, memory-safe language with static typing and protocol-oriented design, optimized for SwiftUI and Combine.
• Objective-C: Retained for legacy frameworks and libraries using the Cocoa Touch API.
• Toolchains:
• Xcode, Instruments, LLDB, Interface Builder, CoreData, and Swift Package Manager.

• Frameworks & Languages:
• Flutter (Dart): Compiles to ARM native code; enables pixel-perfect UIs via Skia rendering engine.
• React Native (JavaScript/TypeScript): Bridges native modules with React via JSI and Hermes engine.
• Xamarin (.NET/C#): Uses Mono runtime for shared logic; integrates with native SDKs through bindings.
• Ionic (HTML/CSS/JS): WebView-based hybrid model; leverages Capacitor for native API access.
• NativeScript: Direct access to native APIs using V8 (Android) and JavaScriptCore (iOS).
• Cordova/PhoneGap: Legacy hybrid approach; supports plugin-based access to native APIs.

• Flutter SDK: Declarative UI builder with widget-based hierarchy and support for platform-specific code through platform channels.
• React Native SDK: Leverages React for declarative UI and supports direct native module bridges.
• SwiftUI: Declarative UI for iOS/macOS platforms; integrates with Combine for reactive data flows.
• Jetpack Compose: Kotlin-first UI toolkit for Android; promotes unidirectional data flow and stateless UI components.

Firebase SDK: Serverless BaaS for push messaging, analytics, authentication, Firestore (NoSQL), and remote config.

Robust, API-first server environments to support business logic, authentication, and data orchestration:

• Node.js + Express: Event-driven, non-blocking backend ideal for real-time apps and microservices.
• Django / Flask: Python-based, WSGI-compliant frameworks with ORM, JWT, and RESTful support.
• Ruby on Rails: MVC-based architecture with convention-over-configuration, ideal for MVPs.
• Laravel: PHP framework supporting Eloquent ORM, Laravel Sanctum/Passport for API auth.
• Firebase: Serverless backend with integrated analytics, Firestore DB, and real-time data sync.

• API Protocols:
• REST (JSON over HTTP), GraphQL (Apollo/Relay), gRPC (protobuf-based), WebSockets.
• Third-Party SDKs:
• Payment Gateways: Stripe, Razorpay, Square, PayPal, Apple Pay, Google Pay.
• Maps & Location: Google Maps API, MapKit, GeoFire.
• Push Notifications: Firebase Cloud Messaging, APNs, OneSignal.
  
  

• Android Studio, Xcode, Visual Studio, Expo CLI for project scaffolding, builds, and testing.
• Network Debugging: Charles Proxy, Wireshark, Fiddler, Stetho.
• API Testing: Postman, Insomnia, Swagger UI, OpenAPI, GraphiQL.

• Unit/UI Testing:
• Android: Espresso, JUnit, Mockito
• iOS: XCTest, Quick/Nimble, OCMock
• Cross-Platform: Appium, Detox, Jest, Mocha, Chai
• Device Testing:
• Firebase Test Lab, BrowserStack, Sauce Labs, TestFlight, and App Center.

• CI/CD Pipelines: Jenkins, CircleCI, Bitrise, GitHub Actions, GitLab CI, Codemagic.
• Deployment Automation: Fastlane for automated code signing, beta uploads (TestFlight, Google Play), and App Store submissions.
• Versioning: Semantic Versioning, Changelog Automation, Sentry Release Hooks.

Analytics, Monitoring & Observability

• User Behavior & Funnel Tracking:
• Firebase Analytics, Mixpanel, Amplitude, Segment.
• Crash Reporting & APM:
• Crashlytics, Sentry, AppDynamics, New Relic Mobile, Bugsnag, LogRocket.
• Monitoring:
• Real-time logs via Firebase Emulator Suite, remote config toggles, feature flags via LaunchDarkly.