
Rehan developed and maintained cross-platform messaging and analytics features for the Customer.io mobile SDKs, focusing on the customerio-android and customerio-reactnative repositories. He architected real-time inbox systems and in-app messaging flows, implementing persistent message storage, state management, and event-driven updates using Kotlin, Swift, and TypeScript. His work included thread-safe event processing, TurboModule migrations, and integration of Server-Sent Events for real-time delivery. Rehan improved reliability by addressing platform compatibility, lifecycle management, and defensive coding for native modules. Through code generation, dependency injection, and robust CI/CD practices, he delivered maintainable, scalable solutions that enhanced user engagement and streamlined developer workflows.
March 2026 (2026-03): Reliability-focused update for the iOS client in customerio-ios. Delivered a targeted fix to the Notification Inbox in In-App Messaging and enhanced test stability for NotificationInboxTest to prevent regressions in message streams and state handling. This work strengthens delivery consistency and user engagement through more robust in-app messaging.
March 2026 (2026-03): Reliability-focused update for the iOS client in customerio-ios. Delivered a targeted fix to the Notification Inbox in In-App Messaging and enhanced test stability for NotificationInboxTest to prevent regressions in message streams and state handling. This work strengthens delivery consistency and user engagement through more robust in-app messaging.
February 2026 performance snapshot focusing on cross-platform delivery of the Inbox/Notification system and its real-time capabilities across Android, iOS, Flutter, and React Native. The work delivered foundational real-time messaging, unified inbox experiences, and observable architectures while improving state management and UX with reliable delivery guarantees.
February 2026 performance snapshot focusing on cross-platform delivery of the Inbox/Notification system and its real-time capabilities across Android, iOS, Flutter, and React Native. The work delivered foundational real-time messaging, unified inbox experiences, and observable architectures while improving state management and UX with reliable delivery guarantees.
Month: 2026-01. Concise monthly summary highlighting key business value delivered through two repos, with emphasis on architectural modernization, feature delivery, and reliability enhancements. Focus on outcomes that enable easier upgrades, better user experience, and maintainable code. Overview of work patterns: migrated architecture, implemented new features, and aligned dependencies to support future development and faster iteration cycles.
Month: 2026-01. Concise monthly summary highlighting key business value delivered through two repos, with emphasis on architectural modernization, feature delivery, and reliability enhancements. Focus on outcomes that enable easier upgrades, better user experience, and maintainable code. Overview of work patterns: migrated architecture, implemented new features, and aligned dependencies to support future development and faster iteration cycles.
December 2025 monthly summary for customerio-reactnative. Focused on performance optimization and architectural modernization to improve reliability, reduce maintenance burden, and accelerate feature delivery for in-app messaging.
December 2025 monthly summary for customerio-reactnative. Focused on performance optimization and architectural modernization to improve reliability, reduce maintenance burden, and accelerate feature delivery for in-app messaging.
November 2025 monthly summary for customerio-reactnative: Modernization, reliability, and analytics enhancements delivering business value and improved developer experience. Key outcomes include RN 0.82 upgrade, push analytics API, and CI improvements across iOS and Android; all changes implemented with explicit commits and validated builds.
November 2025 monthly summary for customerio-reactnative: Modernization, reliability, and analytics enhancements delivering business value and improved developer experience. Key outcomes include RN 0.82 upgrade, push analytics API, and CI improvements across iOS and Android; all changes implemented with explicit commits and validated builds.
October 2025 monthly summary focusing on cross-repo platform readiness, feature deliveries, and stability improvements. Key accomplishments include Android 16 readiness across all major Customer.io SDKs (Expo plugin, Android native, React Native, and Flutter) with coordinated SDK/Gradle updates and lifecycle plugin integration; Expo 54 compatibility and Router migration for the test app; AndroidX 16 compatibility configuration with tests; inline in-app messaging lifecycle optimization; and a critical release crash fix for message type deserialization. These changes reduce production risk, improve user experience on Android devices, and demonstrate strong cross-platform collaboration and platform-agnostic engineering.
October 2025 monthly summary focusing on cross-repo platform readiness, feature deliveries, and stability improvements. Key accomplishments include Android 16 readiness across all major Customer.io SDKs (Expo plugin, Android native, React Native, and Flutter) with coordinated SDK/Gradle updates and lifecycle plugin integration; Expo 54 compatibility and Router migration for the test app; AndroidX 16 compatibility configuration with tests; inline in-app messaging lifecycle optimization; and a critical release crash fix for message type deserialization. These changes reduce production risk, improve user experience on Android devices, and demonstrate strong cross-platform collaboration and platform-agnostic engineering.
Monthly summary for 2025-09 focusing on business value and technical achievement across mobile SDKs. Key features delivered: - customerio-reactnative: In-app Messaging Listener initialization bug fixed; listener is now correctly set on initialize and ReactInAppEventListener is registered in the DI graph for easier access via common imports and the native iOS SDK. - customerio-expo-plugin: Stability and maintainability improvements including dependency-injection based refactor of in-app messaging listener, centralized logging, prebuild validation flow with warnings, and TypeScript/test tooling refinements. - customerio-flutter: Xcode 26 compatibility update with updated native SDK versions and dependencies to ensure forward compatibility. - customerio-ios: APN UIKit theme UI polish with refined button styling, corner radii, shadows, and dynamic color changes for selected/highlight states to improve consistency and UX. Major bugs fixed: - Suppressed logger crash on armeabi devices by adding ABI checks and wrapping potentially crashing operations in try-catch, preserving SDK stability on older architectures. - General logger and native module stability improvements through conditional execution of native logging and defensive programming. Overall impact and accomplishments: - Cross-platform stability improvements reduce crash risk on legacy/varied devices and prepare the codebase for upcoming iOS/macOS and Android SDK updates. - Improved developer experience through better DI usage, centralized logging, prebuild validation, and tooling refinements, enabling faster iteration and safer releases. - Demonstrated forward-compatibility with newer toolchains (Xcode 26) and improved UI polish on iOS, contributing to higher quality user experiences. Technologies/skills demonstrated: dependency injection in React Native, centralized logging, prebuild validation flows, TypeScript and test tooling refinements, ABI awareness and defensive coding for native modules, and UI/UX polish in iOS.
Monthly summary for 2025-09 focusing on business value and technical achievement across mobile SDKs. Key features delivered: - customerio-reactnative: In-app Messaging Listener initialization bug fixed; listener is now correctly set on initialize and ReactInAppEventListener is registered in the DI graph for easier access via common imports and the native iOS SDK. - customerio-expo-plugin: Stability and maintainability improvements including dependency-injection based refactor of in-app messaging listener, centralized logging, prebuild validation flow with warnings, and TypeScript/test tooling refinements. - customerio-flutter: Xcode 26 compatibility update with updated native SDK versions and dependencies to ensure forward compatibility. - customerio-ios: APN UIKit theme UI polish with refined button styling, corner radii, shadows, and dynamic color changes for selected/highlight states to improve consistency and UX. Major bugs fixed: - Suppressed logger crash on armeabi devices by adding ABI checks and wrapping potentially crashing operations in try-catch, preserving SDK stability on older architectures. - General logger and native module stability improvements through conditional execution of native logging and defensive programming. Overall impact and accomplishments: - Cross-platform stability improvements reduce crash risk on legacy/varied devices and prepare the codebase for upcoming iOS/macOS and Android SDK updates. - Improved developer experience through better DI usage, centralized logging, prebuild validation, and tooling refinements, enabling faster iteration and safer releases. - Demonstrated forward-compatibility with newer toolchains (Xcode 26) and improved UI polish on iOS, contributing to higher quality user experiences. Technologies/skills demonstrated: dependency injection in React Native, centralized logging, prebuild validation flows, TypeScript and test tooling refinements, ABI awareness and defensive coding for native modules, and UI/UX polish in iOS.
August 2025 monthly performance summary across Customer.io product lines, with a focus on delivering measurable business value and robust technical outcomes. Key features delivered across repositories include: (1) iOS real-device build support for the React Native example app, enabling reliable QA and deployment readiness on physical devices; (2) robust Customer.io SDK initialization with support for already-initialized state and Expo auto-init, improving startup reliability across RN and Expo projects; (3) FCM integration enhancements featuring custom scheme link support and multi-target environment configuration, plus iOS notification extension logging for better diagnostics; (4) automatic native SDK initialization for Expo on iOS and Android, including plugin support for non-configured push scenarios; (5) push metric tracking logging in the iOS NSE with enhanced logging, protocol updates, and unit tests; (6) Flutter in-app messaging display stabilization to prevent UI glitches when no content is available. Major bugs fixed include: (a) iOS example app build on real devices issue resolved; (b) GistModalActivity crash on early back press fixed with binding initialization guard; (c) improvements to Android push handling and plugin version resolution to reduce configuration drift. Overall impact and accomplishments: this work significantly reduces setup friction, accelerates QA/testing cycles, strengthens cross-platform push messaging reliability, and improves developer experience for Expo-based and native integrations. Technologies/skills demonstrated: React Native, iOS/Android native integration, Expo, FCM, deep linking and URL schemes, CocoaPods, Dart/Flutter, Kotlin/Java, TypeScript, CI/CD, and automated testing.
August 2025 monthly performance summary across Customer.io product lines, with a focus on delivering measurable business value and robust technical outcomes. Key features delivered across repositories include: (1) iOS real-device build support for the React Native example app, enabling reliable QA and deployment readiness on physical devices; (2) robust Customer.io SDK initialization with support for already-initialized state and Expo auto-init, improving startup reliability across RN and Expo projects; (3) FCM integration enhancements featuring custom scheme link support and multi-target environment configuration, plus iOS notification extension logging for better diagnostics; (4) automatic native SDK initialization for Expo on iOS and Android, including plugin support for non-configured push scenarios; (5) push metric tracking logging in the iOS NSE with enhanced logging, protocol updates, and unit tests; (6) Flutter in-app messaging display stabilization to prevent UI glitches when no content is available. Major bugs fixed include: (a) iOS example app build on real devices issue resolved; (b) GistModalActivity crash on early back press fixed with binding initialization guard; (c) improvements to Android push handling and plugin version resolution to reduce configuration drift. Overall impact and accomplishments: this work significantly reduces setup friction, accelerates QA/testing cycles, strengthens cross-platform push messaging reliability, and improves developer experience for Expo-based and native integrations. Technologies/skills demonstrated: React Native, iOS/Android native integration, Expo, FCM, deep linking and URL schemes, CocoaPods, Dart/Flutter, Kotlin/Java, TypeScript, CI/CD, and automated testing.
Concise monthly summary for 2025-07 across Android, React Native, and iOS repos, focusing on performance, cross-platform module delivery, and maintainability. Highlights include UI responsiveness improvements, widespread TurboModule adoption, and platform compatibility work that unlocks faster feature delivery and easier future cross-team collaboration.
Concise monthly summary for 2025-07 across Android, React Native, and iOS repos, focusing on performance, cross-platform module delivery, and maintainability. Highlights include UI responsiveness improvements, widespread TurboModule adoption, and platform compatibility work that unlocks faster feature delivery and easier future cross-team collaboration.
June 2025 monthly summary focused on delivering reliable cross-platform in-app messaging features, strengthening event processing, and modernizing architecture across Android, React Native, iOS, and Expo Plugin. Customerio-driven work supported business value by improving engagement experiences, reducing maintenance risk, and enabling faster iteration through code generation and standardized cross-platform components. Key features delivered: - Android: Event system thread-safety and stability improvements; cross-platform inline in-app message rendering refactor to reduce duplication and improve testability. - React Native: Inline In-App Messaging UI and Demo; RN architecture modernization and cross-platform compatibility; codegen integration and simplification; iOS packaging path updates to support local development. - iOS: Cross-Platform Inline Message Bridge enabling cross-platform rendering and interactions via a native bridge. - Expo Plugin: Inline In-App Messaging with dedicated screen and navigation leveraging InlineInAppMessageView. Major bugs fixed: - Android: Repaired lint warnings and hardened thread-safety for device token processing. - Cross-platform bridge and integration fixes to enable stable messaging flows across RN, iOS, and Flutter bridges. - iOS bridge classes added to support cross-platform inline messaging flow. Overall impact and accomplishments: - Significantly improved reliability and stability of core event processing and in-app messaging UX, reducing potential crash vectors and API surface friction. - Achieved a cleaner, more maintainable codebase with reduced cross-platform duplication through architecture modernization, wrappers, and codegen-driven generation. - We accelerated onboarding and development velocity for cross-platform features, enabling faster delivery of user-facing messaging capabilities. Technologies/skills demonstrated: - Kotlin/Android thread-safety patterns, lint remediation, and testability improvements. - React Native architecture modernization, wrappers, new view managers, and codegen integration. - iOS bridge patterns and cross-platform messaging protocol design. - Cross-platform release and packaging strategies for local development (RN, iOS, Expo).
June 2025 monthly summary focused on delivering reliable cross-platform in-app messaging features, strengthening event processing, and modernizing architecture across Android, React Native, iOS, and Expo Plugin. Customerio-driven work supported business value by improving engagement experiences, reducing maintenance risk, and enabling faster iteration through code generation and standardized cross-platform components. Key features delivered: - Android: Event system thread-safety and stability improvements; cross-platform inline in-app message rendering refactor to reduce duplication and improve testability. - React Native: Inline In-App Messaging UI and Demo; RN architecture modernization and cross-platform compatibility; codegen integration and simplification; iOS packaging path updates to support local development. - iOS: Cross-Platform Inline Message Bridge enabling cross-platform rendering and interactions via a native bridge. - Expo Plugin: Inline In-App Messaging with dedicated screen and navigation leveraging InlineInAppMessageView. Major bugs fixed: - Android: Repaired lint warnings and hardened thread-safety for device token processing. - Cross-platform bridge and integration fixes to enable stable messaging flows across RN, iOS, and Flutter bridges. - iOS bridge classes added to support cross-platform inline messaging flow. Overall impact and accomplishments: - Significantly improved reliability and stability of core event processing and in-app messaging UX, reducing potential crash vectors and API surface friction. - Achieved a cleaner, more maintainable codebase with reduced cross-platform duplication through architecture modernization, wrappers, and codegen-driven generation. - We accelerated onboarding and development velocity for cross-platform features, enabling faster delivery of user-facing messaging capabilities. Technologies/skills demonstrated: - Kotlin/Android thread-safety patterns, lint remediation, and testability improvements. - React Native architecture modernization, wrappers, new view managers, and codegen integration. - iOS bridge patterns and cross-platform messaging protocol design. - Cross-platform release and packaging strategies for local development (RN, iOS, Expo).
May 2025 performance snapshot: Delivered cross-platform improvements to the in-app messaging feature set across Android, React Native, and Flutter. Key architectural refactors in Android established a platform delegate pattern with dedicated in-app message view controllers and improved EngineWebView lifecycle and URL handling. UX and lifecycle enhancements tightened error handling, event dispatch, and modal lifecycle behavior when SDK initialization is incomplete. Expanded testing infrastructure added comprehensive unit tests and utilities for in-app messaging controllers and components, boosting reliability. Fixed Android restore modal handling in the React Native integration to dismiss early when the native SDK is not initialized (aligned with Android SDK 4.6.1). Updated library dependencies for Android and Flutter to newer versions for stability and potential feature improvements. Result: improved reliability, maintainability, and a smoother user experience with cross-platform consistency.
May 2025 performance snapshot: Delivered cross-platform improvements to the in-app messaging feature set across Android, React Native, and Flutter. Key architectural refactors in Android established a platform delegate pattern with dedicated in-app message view controllers and improved EngineWebView lifecycle and URL handling. UX and lifecycle enhancements tightened error handling, event dispatch, and modal lifecycle behavior when SDK initialization is incomplete. Expanded testing infrastructure added comprehensive unit tests and utilities for in-app messaging controllers and components, boosting reliability. Fixed Android restore modal handling in the React Native integration to dismiss early when the native SDK is not initialized (aligned with Android SDK 4.6.1). Updated library dependencies for Android and Flutter to newer versions for stability and potential feature improvements. Result: improved reliability, maintainability, and a smoother user experience with cross-platform consistency.
April 2025 performance summary: Delivered cross-platform improvements across Android, iOS, and Flutter, focusing on robust in-app messaging, sample app stability, and dev-experience enhancements. Key achievements include a modernization of the Android In-App Messaging framework with shared base views and improved WebView handling, inline XML UI examples in the Java sample app, and Kotlin-based architecture cleanup for the sample app. On iOS, region default handling was hardened and CI/CD workflows for sample apps were enhanced with controlled SDK usage and rollback. Flutter updates ensured cross-platform compatibility by aligning dependencies. These efforts improved business value by delivering more reliable user-facing messaging experiences, streamlined development and deployment processes, and reduced maintenance overhead.
April 2025 performance summary: Delivered cross-platform improvements across Android, iOS, and Flutter, focusing on robust in-app messaging, sample app stability, and dev-experience enhancements. Key achievements include a modernization of the Android In-App Messaging framework with shared base views and improved WebView handling, inline XML UI examples in the Java sample app, and Kotlin-based architecture cleanup for the sample app. On iOS, region default handling was hardened and CI/CD workflows for sample apps were enhanced with controlled SDK usage and rollback. Flutter updates ensured cross-platform compatibility by aligning dependencies. These efforts improved business value by delivering more reliable user-facing messaging experiences, streamlined development and deployment processes, and reduced maintenance overhead.
Month: 2025-03. Key achievement: Delivered a unified Customer.io Expo plugin compatibility testing framework that validates the plugin across multiple Expo SDK versions, including automated test app creation, plugin setup, validation, and a CI workflow to ensure ongoing compatibility. The work included scaffolding scripts (create-test-app, setup-test-app, configure-plugin, validate-plugin) and local scripts/README to accelerate local validation, plus a dedicated CI workflow to run compatibility checks on PRs and mainline builds. No major defects were reported; the automation framework reduces risk by catching incompatibilities early. Technologies demonstrated include JavaScript/TypeScript, Node.js scripting, Expo plugin integration, and CI/CD.
Month: 2025-03. Key achievement: Delivered a unified Customer.io Expo plugin compatibility testing framework that validates the plugin across multiple Expo SDK versions, including automated test app creation, plugin setup, validation, and a CI workflow to ensure ongoing compatibility. The work included scaffolding scripts (create-test-app, setup-test-app, configure-plugin, validate-plugin) and local scripts/README to accelerate local validation, plus a dedicated CI workflow to run compatibility checks on PRs and mainline builds. No major defects were reported; the automation framework reduces risk by catching incompatibilities early. Technologies demonstrated include JavaScript/TypeScript, Node.js scripting, Expo plugin integration, and CI/CD.
February 2025 performance summary for the developer across customerio repos. Focused on delivering robust build observability, cross-repo automation, and SDK/version accuracy to unlock faster feedback loops and improved release confidence. Key platform-delivery work included Android, iOS, Flutter, Expo Plugin, and React Native improvements with a consistent emphasis on business value and reliability.
February 2025 performance summary for the developer across customerio repos. Focused on delivering robust build observability, cross-repo automation, and SDK/version accuracy to unlock faster feedback loops and improved release confidence. Key platform-delivery work included Android, iOS, Flutter, Expo Plugin, and React Native improvements with a consistent emphasis on business value and reliability.
January 2025: Cross-repo feature delivery, CI/CD optimization, and branding consistency across iOS, Android, Flutter, Expo, and React Native. Focused on reliability, targeted testing, and improved developer experience, delivering measurable business value through better user experience and faster feedback loops.
January 2025: Cross-repo feature delivery, CI/CD optimization, and branding consistency across iOS, Android, Flutter, Expo, and React Native. Focused on reliability, targeted testing, and improved developer experience, delivering measurable business value through better user experience and faster feedback loops.
December 2024 highlights: Delivered configurable screen view events in the Android SDK to balance analytics and in-app messaging, enhanced Expo integration for accurate user-agent tracking, and stabilized the test/dev environments with tarball plugin dependencies. Also fixed a test data integrity bug related to dynamic attribute keys, improving data quality and developer reliability. These efforts improve analytics fidelity, reduce integration risk, and accelerate local testing.
December 2024 highlights: Delivered configurable screen view events in the Android SDK to balance analytics and in-app messaging, enhanced Expo integration for accurate user-agent tracking, and stabilized the test/dev environments with tarball plugin dependencies. Also fixed a test data integrity bug related to dynamic attribute keys, improving data quality and developer reliability. These efforts improve analytics fidelity, reduce integration risk, and accelerate local testing.
November 2024 monthly summary focused on delivering a robust, cross-platform data pipeline and SDK initialization foundation, improved configuration handling, analytics hygiene, and CI/CD discipline across Flutter, React Native, and Android/iOS ecosystems. Key groundwork completed enabled reliable data integration, better error handling, and a matured release process that supports scalable customer onboarding and consistent analytics. Key features delivered: - Flutter: Data Pipelines configuration and UI (CustomerIOConfig, InAppConfig, PushConfig) enabling data pipeline integration and improved configuration handling. - Flutter Native SDK Initialization with Builders: iOS and Android builder-based initialization (SDKConfigBuilder) for robust setup, API key/region handling, and improved error reporting. - Data Pipelines Settings UI Improvements: Validation of API keys, site IDs, and hostnames to ensure data integrity. - Event Tracking and Screen Tracking hygiene: Renamed event parameters from attributes to properties; unified screen tracking naming using title and properties with better error handling for missing titles. - CI/CD and Versioning: Fail-fast CI pipeline, robust versioning scripts across Dart/Flutter and Android resources, and consolidated release tooling. - Android Push and CDP integration: Android push module with CDP API key usage, device token retrieval, and enhanced push messaging via SDK builder; improved Android push configuration. - iOS SDK Client Configuration and Call Handling: Centralized iOS client source/config handling and refactored in-app messaging call flows for Flutter integration. - React Native: Dependency upgrades to maintain RN 0.76 compatibility and CI/Apps/APN/FCM integrations. - Android stability: Safe handling of Intent extras in FCM push path to prevent crashes. Overall impact and accomplishments: - Increased reliability and scalability of data pipelines and push messaging across mobile platforms. - Improved developer experience through unified configuration patterns, clearer analytics naming, and stronger CI/CD discipline. - Reduced risk of runtime crashes and data inconsistencies through validation and robust initialization flows. Technologies/skills demonstrated: - Flutter plugin architecture, Dart/Flutter, and native integration builders for iOS/Android. - Cross-platform analytics naming and screen tracking conventions. - Android and iOS push integration (CDP keys, token handling, in-app messaging), React Native compatibility management. - CI/CD pipelines, versioning automation, and script robustness.
November 2024 monthly summary focused on delivering a robust, cross-platform data pipeline and SDK initialization foundation, improved configuration handling, analytics hygiene, and CI/CD discipline across Flutter, React Native, and Android/iOS ecosystems. Key groundwork completed enabled reliable data integration, better error handling, and a matured release process that supports scalable customer onboarding and consistent analytics. Key features delivered: - Flutter: Data Pipelines configuration and UI (CustomerIOConfig, InAppConfig, PushConfig) enabling data pipeline integration and improved configuration handling. - Flutter Native SDK Initialization with Builders: iOS and Android builder-based initialization (SDKConfigBuilder) for robust setup, API key/region handling, and improved error reporting. - Data Pipelines Settings UI Improvements: Validation of API keys, site IDs, and hostnames to ensure data integrity. - Event Tracking and Screen Tracking hygiene: Renamed event parameters from attributes to properties; unified screen tracking naming using title and properties with better error handling for missing titles. - CI/CD and Versioning: Fail-fast CI pipeline, robust versioning scripts across Dart/Flutter and Android resources, and consolidated release tooling. - Android Push and CDP integration: Android push module with CDP API key usage, device token retrieval, and enhanced push messaging via SDK builder; improved Android push configuration. - iOS SDK Client Configuration and Call Handling: Centralized iOS client source/config handling and refactored in-app messaging call flows for Flutter integration. - React Native: Dependency upgrades to maintain RN 0.76 compatibility and CI/Apps/APN/FCM integrations. - Android stability: Safe handling of Intent extras in FCM push path to prevent crashes. Overall impact and accomplishments: - Increased reliability and scalability of data pipelines and push messaging across mobile platforms. - Improved developer experience through unified configuration patterns, clearer analytics naming, and stronger CI/CD discipline. - Reduced risk of runtime crashes and data inconsistencies through validation and robust initialization flows. Technologies/skills demonstrated: - Flutter plugin architecture, Dart/Flutter, and native integration builders for iOS/Android. - Cross-platform analytics naming and screen tracking conventions. - Android and iOS push integration (CDP keys, token handling, in-app messaging), React Native compatibility management. - CI/CD pipelines, versioning automation, and script robustness.

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