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Islam Abdelhamid
Verified Expert in Engineering
Full-stack Developer
Cairo, Cairo Governorate, Egypt
Toptal member since September 16, 2022
Bio
Islam is a full-stack developer with over a decade of experience in web development and systems architecture. He is a highly motivated and self-organized professional who can find the perfect balance between delivery speed and high-quality output. Islam's broad background has given him the technical skills to contribute to innovative projects and large-scale services and lead developer teams.
Portfolio
GSI Technologies LLC
Full-stack Development, Agile Software Development, Web App Development...
Ethos Network, Inc.
TypeScript, Next.js, JavaScript, React, Data Structures, Web3, Blockchain...
Yara
Node.js, NestJS, GraphQL, HTML, TypeScript, MERN Stack, GitHub Actions, OAuth...
Experience
- Node.js - 8 years
- React - 8 years
- Java - 6 years
- Complex Problem Solving - 6 years
- GitLab CI/CD - 4 years
- Docker - 4 years
- TypeScript 3 - 3 years
- Kubernetes - 3 years
Work Experience
Senior Full-stack Developer
2025 - 2025
GSI Technologies LLC
- Delivered a functional MVP by engineering scalable front-end features in Next.js and robust back-end services in Node.js, ensuring the platform could support future real-time financial data integrations while maintaining high code quality.
- Developed a financial data aggregation service to consolidate finance data, powering real-time reporting, financial summaries, and interactive dashboards with accurate insights based on both synced transactions and manual inputs.
- Collaborated closely with the Tech Lead and Product Manager in an Agile environment, translating high-level business requirements into detailed technical specifications.
- Supported AI-driven initiatives by contributing to prompt engineering and validating data extraction workflows for financial document automation.
Technologies: Full-stack Development, Agile Software Development, Web App Development, Next.js, Node.js, Data Structures, Database Structure, APIs, Amazon Web Services (AWS), Architecture, React, Artificial Intelligence (AI), Large Language Models (LLMs), Natural Language Processing (NLP), Finance, Prompt Engineering, Document Processing, Data Extraction, Plaid API, Stripe API, AWS ECS Fargate, AWS IAM, GitHub Actions, OAuth, Amazon Simple Queue Service (SQS), Chart.js
Senior Full-stack Developer
2024 - 2024
Ethos Network, Inc.
- Enhanced a Web3 application user experience by implementing new product features, animations, and seamless interactions with back-end components using Next.js, creating a smoother and more engaging user journey.
- Built reliable and efficient systems for handling on-chain events to support specific application features by interacting with the blockchain and event processing system using Node.js.
- Developed and implemented PWA notifications for web, Android, and iOS, delivering real-time updates and important messages to users, significantly increasing app engagement.
Technologies: TypeScript, Next.js, JavaScript, React, Data Structures, Web3, Blockchain, Sentry, Amplitude, Ant Design, Responsive UI, MERN Stack, Tailwind CSS, Redis, GitHub Actions, OAuth
Senior Full-stack Developer
2023 - 2024
Yara
- Developed cutting-edge agricultural technology for farmers at Yara International. Utilized microservices and GraphQL in NestJS, coupled with React for the front end, to create intuitive tools enhancing farming practices.
- Integrated 3rd-party solutions to enrich the functionality of the main product at Yara. This broadened the scope and effectiveness of Yara's agricultural offerings, providing farmers with comprehensive tools for optimizing their practices.
- Introduced the transition from CircleCI to GitHub Actions. This initiative ignited the optimization of our development workflow, improving efficiency and scalability in continuous integration and deployment processes.
Technologies: Node.js, NestJS, GraphQL, HTML, TypeScript, MERN Stack, GitHub Actions, OAuth, Mapbox API
Senior Full-stack Engineer
2019 - 2022
Booking.com
- Contributed to the development of a large-scale distributed payment platform. It handles millions of user payment requests daily as part of the payments business unit.
- Built a payments portal for Booking.com using Node.js and React. It allows payment clients to monitor users' payment activities, configure payment platform parameters, and control the access of their payment gateway.
- Created a fully customized documentation framework using Gatsby and Node.js for technical writers in the fintech. It helped them to build high-quality internal documentation for payment services with a lot of dynamic features.
- Wrote very optimized Hadoop queries on top of Elasticsearch to generate daily reports about payment activities.
Technologies: Java, Node.js, Docker, Docker Compose, React, TypeScript 3, CSS4, HTML, Large-scale Projects, Distributed Systems, GitLab CI/CD, Object-oriented Programming (OOP), Database Management Systems (DBMS), TypeScript, API Integration, GraphQL, Git, CSS, React Redux, Cloud, Continuous Deployment, SQL, Databases, Travel & Leisure, Full-stack, Front-end, Back-end, Next.js, Figma, Express.js, TypeORM, Bootstrap, Material UI, User Interface (UI), MUI CSS, SOAP, REST APIs, Back-end Development, Continuous Delivery (CD), Build Automation, Software Architecture, Design Patterns, Kubernetes, Gatsby, Apache Kafka, MySQL, Python, Full-stack Development, APIs, Architecture, Authentication, Serverless, NoSQL, Microservices, Web Development, JavaScript Libraries, OAuth 2, OpenID, Single-page Applications (SPAs), Technical Leadership, Scalable Architecture, Software Design, Fintech, Algorithms, Web Applications, HTML5, Sass, OpenTelemetry, OAuth, Payment Gateways, Chart.js
Full-stack Developer
2016 - 2019
Booking.com
- Re-architected the payment infrastructure system and moved the payments logic from a single monolithic architecture based on Perl to a microservices architecture based on different tech-stack like Node.js and Java.
- Built the first e-wallet for Booking.com users using React and Node.js, allowing them to receive rewards and virtual credit within their account and spend it later on their next booking.
- Organized multiple site reliability engineering (SRE) task force initiatives to support the development teams.
Technologies: Perl, HTML, jQuery, JavaScript, TypeScript 3, React, System Architecture, CSS, GitLab CI/CD, Docker, Docker Compose, Object-oriented Programming (OOP), Database Management Systems (DBMS), Node.js, API Integration, Git, Continuous Deployment, SQL, Databases, Travel & Leisure, Team Leadership, Full-stack, Front-end, Back-end, Figma, Express.js, Material UI, User Interface (UI), MUI CSS, REST APIs, Back-end Development, Continuous Delivery (CD), Build Automation, Software Architecture, Design Patterns, Full-stack Development, APIs, Architecture, Authentication, Serverless, NoSQL, Microservices, Web Development, JavaScript Libraries, OAuth 2, OpenID, Single-page Applications (SPAs), Technical Leadership, Scalable Architecture, Software Design, Fintech, Algorithms, Web Applications, HTML5, Sass, gRPC
Co-founder | Chief Technology Officer (CTO)
2013 - 2014
RTopia Startup
- Developed the first mobile game that combines augmented reality technology and physical drones to deliver new and fun experiences merging video games and reality.
- Customized a well-known augmented reality software development kit (SDK) to allow integration with multiple game engines, including Unity 3D.
- Built the interface layer between drone hardware and Android SDK to allow users and gamers to control drones from their mobiles.
Technologies: Augmented Reality (AR), Object-oriented Programming (OOP), Database Management Systems (DBMS), Git, CSS, Databases, CTO, Team Leadership, Full-stack, Front-end, Back-end, MongoDB, REST APIs, Back-end Development, Design Patterns, Full-stack Development, APIs, Architecture, Authentication, Gaming, Web Development, JavaScript Libraries, C#, Mobile, Web Applications, HTML5, Sass
Senior Full-stack Node.js and React Developer
2013 - 2013
Cameron Roth
- Created a ticket search system using Nest.js. The system enables users to perform a comparative analysis of sports ticket prices offered by various providers, allowing them to decide on the most cost-effective option.
- Built a visually stunning and lightweight design that was crafted using React and TypeScript. This allowed for the creation of an interface that is both user-friendly and visually appealing.
- Managed the project's infrastructure management, utilizing scalable and secure services using Amazon EC2. This ensured a stable and reliable foundation for the project with a continuous deployment set up.
Technologies: JavaScript, React, Node.js, APIs, Requirements, Search Engines, React Native, Full-stack, Amazon EC2, AWS ECS Fargate
Software Engineer
2011 - 2013
Orange
- Enabled the Orange network operators to launch their voice over Internet Protocol (VoIP) products in one user interface, allowing the customers to use services like charge credit, set call tune, and call history.
- Helped deliver a mobile application for smart cars, enabling users to view useful statistics about their vehicles, calculate fuel consumption, and receive maintenance alerts.
- Organized coding coaching sessions for newcomers to help them with their onboarding and fast integration with their assigned teams.
- Participated in global coding and programming competitions, helping the company win first place on many occasions.
Technologies: AngularJS, Java 6, JavaScript, WebRTC, HTML5, Xamarin, Android SDK, Angular, Databases, Full-stack, Front-end, Back-end, MongoDB, PHP, SOAP, REST APIs, C++, Back-end Development, Design Patterns, CSS3, Full-stack Development, APIs, Architecture, Authentication, Gaming, Web Development, C#, Mobile, Web Applications, Sass
Senior Perl and WebRTC Developer
2012 - 2012
IP Cortex Limited
- Analyzed and fixed issues with the communication component between Asterisk and WebRTC clients for a VoIP platform.
- Developed a scalable processes orchestrator component to handle multiple connections on different CPU cores, manage interprocess communication, and distribute the load between all subprocesses.
- Developed an easy way to monitor the health of the running processes to detect any failure and respawn additional processes if needed.
Technologies: Perl, WebRTC, VoIP, Processing & Threading
Project History
Senior Full-stack Developer
A Next.js-based platform and Web3 project for a decentralized reputation and credibility system. I implemented new product features, animations, and seamless back-end interactions to create a smoother user journey. Additionally, I built efficient systems for processing on-chain events with Node.js and developed cross-platform PWA notifications for real-time updates on the web, Android, and iOS.
GSI Financial Platform
http://gsi-tech.aiA financial data aggregation service that consolidated transactions from banks and manual user inputs into a unified platform. The system powered real-time reporting, financial summaries, and interactive dashboards, ensuring users had accurate insights for decision-making with AI-driven document automation extraction workflows to streamline financial data processing.
Senior Full-stack Developer
http://yara.comA microservices-based agricultural technology platform for farmers. I developed intuitive tools using NestJS with GraphQL and React, integrated 3rd-party solutions to enhance product functionality, and led the transition from CircleCI to GitHub Actions to optimize CI/CD workflows and improve development efficiency.
Event Ticketing Search Engine
A Node.js search engine for event ticketing. I was the only full-stack developer on the team. I built a highly available and robust system to connect and integrate with different event ticket providers using REST API. I also provided the search results back to the user. I built the app front-end using React and TypeScript.
Payment Gateway
The project represents a Java-based large-scale distributed system serving as a payment gateway for other Booking.com products to handle customer payments. It stores millions of payment transactions per day using multiple data storages, like MySQL with multiple masters and multiple slaves architecture and the other one based on Cassandra.
The number of sub-products on Booking.com is increasing, generating daily requests from users trying to pay for their hotel accommodations, car rentals, or booked flights. Such a service requires a highly-scaled distributed system to handle all user payments and cover all payment flows for various products.
I was part of a large team of 7-10 people, and we all worked together to build and maintain all the related services under the payment platform.
The number of sub-products on Booking.com is increasing, generating daily requests from users trying to pay for their hotel accommodations, car rentals, or booked flights. Such a service requires a highly-scaled distributed system to handle all user payments and cover all payment flows for various products.
I was part of a large team of 7-10 people, and we all worked together to build and maintain all the related services under the payment platform.
Payment Back Office
An internal tool that provides a friendly user interface for Booking.com payment platform clients to view and monitor their payment activities.
Many clients have been integrated with the Booking.com payment gateway, so it has to be one place to quickly onboard new clients to the payment platform, configure payment-specific parameters, and monitor, diagnose, and debug issues with payment transactions.
I was the only full-stack developer on the team, in charge of delivering the complete functionality from end to end and breaking down the business requirements.
Many clients have been integrated with the Booking.com payment gateway, so it has to be one place to quickly onboard new clients to the payment platform, configure payment-specific parameters, and monitor, diagnose, and debug issues with payment transactions.
I was the only full-stack developer on the team, in charge of delivering the complete functionality from end to end and breaking down the business requirements.
Payment Documentation Framework
It is a fully customized framework for technical writers to help them generate high-quality documentation for Booking.com's internal services.
Booking.com has its payment platform, and competing on the global stage against other payment platforms requires world-class technology and a world-class technical documentation site.
I was the only full-stack developer on the team, tasked with delivering the full functionality from end to end.
Booking.com has its payment platform, and competing on the global stage against other payment platforms requires world-class technology and a world-class technical documentation site.
I was the only full-stack developer on the team, tasked with delivering the full functionality from end to end.
Booking Pay
Booking Pay is an e-wallet with various services that enables frequent travelers to quickly and safely pay for all services offered by Booking.com using multiple payment methods or e-credit.
The solution also allows them to store their payment methods and credit in multiple currencies and pay globally for booked and unbooked activities, with access to loyalty initiatives such as rewards, discounts, and cash-backs.
I worked as a full-stack developer with one front-end developer, a back-end developer, and two app developers.
The solution also allows them to store their payment methods and credit in multiple currencies and pay globally for booked and unbooked activities, with access to loyalty initiatives such as rewards, discounts, and cash-backs.
I worked as a full-stack developer with one front-end developer, a back-end developer, and two app developers.
Education
2007 - 2011
Bachelor's Degree in Information Technology and Computer Science
Faculty of Computer Science and Information Technology, Cairo University - Egypt
Skills
Libraries/APIs
Node.js, REST APIs, React, OpenID, Chart.js, jQuery, WebRTC, React Redux, Plaid API, Stripe API, Mapbox API
Tools
Git, Figma, AWS IAM, Docker Compose, GitLab, GitLab CI/CD, Google Analytics, Sentry, Amazon Simple Queue Service (SQS)
Languages
HTML, JavaScript, CSS, TypeScript, SQL, Sass, TypeScript 3, GraphQL, C#, C++, Java, CSS4, Perl, Java 9, JavaScript 6, Java 6, HTML5, PHP, CSS3, Python
Frameworks
Express.js, Next.js, Bootstrap, Material UI, MUI CSS, OAuth 2, gRPC, AngularJS, Android SDK, Angular, Spring Boot, Flutter, NestJS, React Native, Ant Design, Tailwind CSS
Paradigms
Design Patterns, Microservices, Object-oriented Programming (OOP), Continuous Deployment, Continuous Delivery (CD), UX Design, Agile Software Development
Platforms
Software Design Patterns, Docker, Kubernetes, MacOS, Linux, Visual Studio Code (VS Code), Xamarin, Amazon Web Services (AWS), Apache Kafka, Mobile, Amazon EC2, Blockchain
Industry Expertise
Travel & Leisure
Storage
MySQL, Database Management Systems (DBMS), Databases, MongoDB, PostgreSQL, NoSQL, Elasticsearch, Redis, Database Structure
Other
Full-stack, Back-end, Back-end Development, Full-stack Development, APIs, Web Development, Single-page Applications (SPAs), Technical Leadership, Scalable Architecture, Software Design, Fintech, Algorithms, Web Applications, Complex Problem Solving, Large-scale Projects, API Integration, Front-end, User Interface (UI), SOAP, Build Automation, Software Architecture, Architecture, Authentication, Serverless, Gaming, JavaScript Libraries, Responsive UI, MERN Stack, AWS ECS Fargate, GitHub Actions, OpenTelemetry, OAuth, Payment Gateways, Data Structures, Computer Vision, Genetic Algorithms, Networks, Web Security, Distributed Systems, System Architecture, Augmented Reality (AR), CSS5, Gatsby, AsciiDoc, Cloud, CTO, Team Leadership, TypeORM, VoIP, Processing & Threading, Requirements, Search Engines, Web3, Amplitude, CI/CD Pipelines, Artificial Intelligence (AI), Large Language Models (LLMs), Web App Development, Natural Language Processing (NLP), Finance, Prompt Engineering, Document Processing, Data Extraction
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