Ziad – Android, Kotlin, CI/CD

A global travel app used by millions of people to book stays, flights, taxis, and attractions. I work on the Android app's architecture and platform, owning areas such as incentives and loyalty, privacy and consent, server-driven UI, and push notifications, and I also contribute to the Java back-end services behind them.

• Led multi-team projects end-to-end and mentored developers on the team;
• Architected and led the rewrite of the Incentives API service from Perl to Java.;
• Initiated the move of Incentives from native UI to server-driven UI and designed the backend service behind it;
• Owned Privacy & Compliance on Android by designing and rolling out standardized consent-gathering components;
• Modernized the Incentives Android stack, driving a meaningful increase in incentive-based bookings, a significant reduction in reported bugs, and better testability and maintainability;
• Enabled a new type of push campaign for the Taxi and Flights verticals by moving Android notification channels to a backend-driven model;
• Increased the Incentives team's delivery speed by taking on backend tasks for campaign and experimentation setup;
• Extended loyalty tooling from web to Android and added corporate branding support for business bookers;
• Overhauled the legacy Android tracking foundation (AppsFlyer, marketing tracking, landing pages, and preinstall flows), improving stability and maintainability;
• Modernized the attribution stack by fixing long-standing deeplink and language-tracking issues, improving tracking correctness;
• Reduced crash rates by identifying systemic stability issues and shipping targeted fixes.

A production-grade cross-platform mobile application for both Android and iOS using Kotlin Multiplatform, enabling shared code and consistent functionality across platforms.

• Owned the end-to-end product lifecycle, including architecture decisions, development, monitoring, production release, and iteration;
• Designed, architected, and delivered a production Kotlin Multiplatform application, sharing core business logic across Android and iOS while delivering platform-specific functionality through native integrations;
• Built an offline-first, modular architecture with well-defined domain, data, and presentation layers;
• Implemented cross-platform monitoring and analytics with Firebase Analytics.

An e-commerce platform focused on pet products and services, supporting core online shopping functionality and a seamless customer experience.

• Managed a cross-functional team of 7 across backend, mobile, and design, defining the technical direction and ensuring successful delivery;
• Managed the migration from a white-label vendor platform to an in-house system, planning the cutover to preserve user accounts and active sessions;
• Integrated the HyperPay payment gateway in direct collaboration with the provider;
• Defined business requirements and translated product discussions with the CEO into scoped tickets and design briefs for the team.

An on-demand e-commerce and grocery delivery platform connecting consumers, drivers, and local stores. I co-founded it and led all engineering, delivering four production apps across Android, iOS, and the back end.

• Co-founded the platform and defined its overall technical direction from day one;
• Built and led the engineering team from scratch across Android, iOS, back end, and QA, hiring, onboarding, and mentoring engineers;
• Designed and delivered four production apps: Consumer, Turbo Driver, Standard Driver, and Picker;
• Introduced a server-driven UI system for Android and iOS, enabling dynamic screens, remote feature configuration, and new features without app releases;
• Guided the architecture and scaled the system to support real-time order tracking and efficient logistics, contributing to the Spring Boot services;
• Set up CI/CD, coding standards, and automated testing, building a strong engineering culture;
• Partnered with product and operations to prioritize features and support go-live in multiple cities.

A food delivery platform serving the MENA region, featuring dedicated mobile applications for consumers and delivery drivers. The product was developed from an early pre-release stage through a major acquisition, with continued development and support following the acquisition.

• Led and managed a mobile team of around 10 developers;
• Released and owned the Carriage consumer app, which won the Best Hidden Gem award in MENA (2018);
• Led the marketing SDK integrations (Braze, Google Analytics, Google Tag Manager, Adjust) and the global search integration with Delivery Hero's central teams in Berlin;
• Designed and built real-time order tracking across the consumer app, driver app, and back end;
• Refactored and modernized the consumer and driver apps, improving maintainability and reducing regression bugs;
• Reached 70% UI test coverage with Espresso and covered the business logic with unit tests;
• Published APIs in the backend using Ruby on Rails.

An OTT streaming platform with applications for mobile devices, tablets, and set-top boxes (STBs), enabling users to stream live TV and on-demand movies via HLS.

• Built a fully custom media player tailored to the product's needs;
• Delivered the set-top box (STB) version with TV remote control support;
• Resolved performance issues in the player, resulting in a smoother user experience;
• Designed and implemented complex custom UI with tablet support;
• Segmented and profiled movies and videos using FFmpeg to deliver multimedia content via HLS;
• Created RESTful web services using PHP;
• Integrated full social media features for Twitter, YouTube, and Instagram.