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Ziad Gamal

@ziadgamal

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Senior Lead Android Engineer at Booking.com, modernizing Incentives and increasing bookings by 15%.

Netherlands

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At Booking.com, I lead Android projects including the modernization of Incentives, which increased incentive-based bookings by 15% and cut reported bugs by 20%. I also designed standardized consent components for Privacy & Compliance and rewrote the Incentives API service from Perl to Java.

At Plato, I fixed Home screen data-loading issues, set up database infrastructure for concurrent reads and writes, and introduced automated CI checks and release pipelines.

At Carriage Co. (acquired by Delivery Hero), I led a mobile team of around 10 developers and designed and built tracking across the consumer app, driver app, and backend. I also modernized the apps and helped achieve 70% UI test coverage.

I co-founded Circle Co. and built its tech team and four apps across mobile and backend. I also designed and delivered Rafeki, a production Kotlin Multiplatform app for Android and iOS, and currently lead a cross-functional team at Pet Market.

Experience

Work history, roles, and key accomplishments

Current

Senior Lead Android Engineer

Current

Booking.com

Dec 2019 - Present (6 years 10 months)

Led multi-team projects end to end and mentored developers. Owned Privacy & Compliance on Android, modernized the Incentives Android stack, and architected the rewrite of the Incentives API service from Perl to Java.

Kotlin Java Jetpack Compose Kotlin Multiplatform (KMP)Coroutines RxJava2 Dagger 2 Clean Architecture MVI Modularization Android Architecture Components

Senior Android Engineer (Contract via Toptal)

Plato

Jun 2026 - Aug 2026 (2 months)

Reduced errors on the Home screen by fixing root causes in data loading and state handling. Set up database infrastructure for write-ahead logging with dedicated reader threads and led the migration of the network layer.

Kotlin Coroutines Flow ROOM CI CD

Co-founder & Tech Lead

Circle Co.

Apr 2019 - Apr 2023 (4 years)

Launched an e-commerce platform connecting consumers, drivers, and local stores, which later expanded into grocery delivery. Built and led the entire tech team from the ground up and led the design and delivery of four apps across mobile and backend.

Kotlin Coroutines Dagger 2 Anvil Modularization Clean Architecture MVVM MVP Android Architecture Components

Senior Android Engineer & Mobile Tech Lead

Carriage Co.

Apr 2016 - Nov 2019 (3 years 7 months)

Led and managed a mobile team of around 10 developers. Released and managed the Carriage Consumer app, winner of the Best Hidden Gem award in MENA (2018), and designed the tracking feature across consumer app, driver app, and backend.

Java Kotlin RxJava2 Dagger 2 Clean Architecture MVVM MVP Android Architecture Components

Android Engineer

Universal Watch Co.

Feb 2014 - Mar 2016 (2 years 1 month)

Designed and implemented complex custom UI with tablet support and built a fully custom media player tailored to the product's needs. Delivered the set-top box version and integrated full social media features.

Java RxJava2 MVP Custom Video Player Custom Animations Social Media Integration HLS Streaming

Creator Production app

Rafeki

Designed, architected, and delivered a production Kotlin Multiplatform application, sharing core business logic across Android and iOS. Built an offline-first, modular architecture and implemented cross-platform monitoring and analytics with Firebase Analytics.

Kotlin Multiplatform (KMP)Kotlin Coroutines Flow Clean Architecture Firebase Analytics Native Module Integration (IOS and Android)

Tech Lead

Pet Market

Lead a cross-functional team across backend, mobile, and design, setting the technical direction. Leading the move from a white-label vendor platform to an in-house system and led the HyperPay payment gateway integration.

Kotlin Multiplatform (KMP)Spring Boot Java