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I'm Orwa Kassab, a versatile Software Engineer with over 7 years of experience, specializing in back-end development with Java, Spring Boot, and event-driven systems. I’m adept at building robust applications, optimizing performance, and modernizing legacy systems using reactive programming and microservices. While back-end engineering is my primary focus, I also bring solid expertise in mobile development, particularly Android apps with Kotlin and Jetpack Compose. I value clean code, teamwork, and thoughtful solutions, and I work best in collaborative environments where there's room to learn, solve real problems, and build software that people actually enjoy using.…I'm Orwa Kassab, a versatile Software Engineer with over 7 years of experience, specializing in back-end development with Java, Spring Boot, and event-driven systems. I’m adept at building robust applications, optimizing performance, and modernizing legacy systems using reactive programming and microservices. While back-end engineering is my primary focus, I also bring solid expertise in mobile development, particularly Android apps with Kotlin and Jetpack Compose. I value clean code, teamwork, and thoughtful solutions, and I work best in collaborative environments where there's room to learn, solve real problems, and build software that people actually enjoy using.

Orwa Kassab

Back-End Developer, Full Stack Developer, Web Developer, +2

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I'm Orwa Kassab, a versatile Software Engineer with over 7 years of experience, specializing in back-end development with Java, Spring Boot, and event-driven systems. I’m adept at building robust applications, optimizing performance, and modernizing legacy systems using reactive programming and microservices. While back-end engineering is my primary focus, I also bring solid expertise in mobile development, particularly Android apps with Kotlin and Jetpack Compose. I value clean code, teamwork, and thoughtful solutions, and I work best in collaborative environments where there's room to learn, solve real problems, and build software that people actually enjoy using.…I'm Orwa Kassab, a versatile Software Engineer with over 7 years of experience, specializing in back-end development with Java, Spring Boot, and event-driven systems. I’m adept at building robust applications, optimizing performance, and modernizing legacy systems using reactive programming and microservices. While back-end engineering is my primary focus, I also bring solid expertise in mobile development, particularly Android apps with Kotlin and Jetpack Compose. I value clean code, teamwork, and thoughtful solutions, and I work best in collaborative environments where there's room to learn, solve real problems, and build software that people actually enjoy using.

Available to hire

I’m Orwa Kassab, a versatile Software Engineer with over 7 years of experience, specializing in back-end development with Java, Spring Boot, and event-driven systems. I’m adept at building robust applications, optimizing performance, and modernizing legacy systems using reactive programming and microservices.

While back-end engineering is my primary focus, I also bring solid expertise in mobile development, particularly Android apps with Kotlin and Jetpack Compose. I value clean code, teamwork, and thoughtful solutions, and I work best in collaborative environments where there’s room to learn, solve real problems, and build software that people actually enjoy using.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Arabic

Fluent

English

Advanced

German

Beginner

Work Experience

Software Engineer at Zain Kuwait (Duwaween Games)

March 1, 2023 - October 28, 2025

Refactored legacy Java codebase for online card games to adopt a new reactive protocol using rSocket, boosting usability and performance by 40% through an event-driven architecture. Developed new games (Hand & Tarneeb) with real-time synchronization and a seamless player experience. Built a full custom simulator for stress testing, identifying faults and bottlenecks under heavy load; findings led to a critical storage layer redesign and bug fixes, resolving a blocking issue and improving system efficiency.

Android Developer at Smart Angle

October 1, 2022 - October 1, 2022

Refactored two legacy Android applications by integrating MVVM architecture and Jetpack Compose with Kotlin, improving maintainability and scalability by 60%. Managed Google Billing and in-app purchases for an e-learning app. Developed a modern Android application to promote artists, musicians, and designers, and to organize events and competitions.

Back End/Android Developer at Smart Touch Group

November 1, 2020 - November 1, 2020

Analyzed system requirements and led the development of four e-commerce applications, creating UML diagrams and designing databases for optimal performance. Built, tested, and maintained RESTful APIs in pure PHP and the Laravel framework. Researched user needs to guide feature development, including QR barcode integration for party-planning apps, a queuing subsystem for public transport vehicles, and additional server-side functionalities for comprehensive content management. Developed Android applications in Java leveraging RxJava for improved efficiency.

Android Developer / UX Designer at Digital Edge

February 1, 2020 - February 1, 2020

Designed mockups and wireframes for three mobile applications using Figma and Pencil. Developed a custom native Android application requiring advanced offline data storage with Room and synchronization handled via logging tables. Implemented robust design patterns and Material Design while integrating Firebase services (Cloud Messaging, Real-Time Database, and Authentication) to enable real-time updates, notifications, and secure access, ensuring a seamless and optimized user experience. Led the transition in the team from Java to Kotlin for Android development.