Mohamed Oussama Khezour
Verified Expert in Engineering
Full-stack Engineer and Developer
Sliema, Malta
Toptal member since August 29, 2023
Oussama is a full-stack engineer specializing in React Native. With over five years in the field, he has contributed to various projects that have solved real-world challenges. He has also developed critical internal tools that have enhanced organizational efficiency. Proficient in both front- and back-end technologies, Oussama's commitment to high-quality coding and best practices positions him as a dependable asset in any software development endeavor.
Portfolio
Experience
- SQL - 2 years
- TypeScript - 2 years
- React - 2 years
- JavaScript - 2 years
- React Native - 2 years
- AWS Lambda - 1 year
- Databases - 1 year
- Node.js - 1 year
Availability
Preferred Environment
React Native, TypeScript, React, Node.js, Amazon Web Services (AWS), SQL, Swift, Kotlin/Native, SwiftUI, Expo
The most amazing...
...thing I've done was serving as a key contributor to Nivoda's mobile B2B app, which resulted in a threefold increase in the user base within a year.
Work Experience
Senior Full-stack Developer
PepsiCo Global - Main
- Migrated the Gatorade GX app’s deployment pipelines to GitHub Actions, making the CI/CD process more reliable and easier to maintain.
- Developed native features for the Gatorade GX app using Kotlin (Android) and Swift (iOS), helping to improve the app’s usability and functionality.
- Assisted in moving the SodaStream app from Xamarin to React Native, which simplified the development workflow and improved app performance.
React Native Engineer
Nivoda
- Led the Nivoda mobile app's feature alignment with its web counterpart, increasing user engagement three times within one year.
- Re-engineered the checkout flow from the ground up and introduced Stripe payments and multiple shipping options, resulting in positive customer feedback and enhanced user experience.
- Standardized UI elements by developing a reusable, type-safe component library, reducing styling code by 40%.
- Instituted best coding practices, including TypeScript migration and ESLint rule enforcement, elevating code quality and long-term maintainability.
- Achieved a 65% reduction in iOS app size and a 40% reduction in Android app size through optimization techniques.
- Directed the version 2 product release, incorporated new features and a complete redesign, and expanded product offerings to include Gemstones.
- Automated app store submissions and updates using CI/CD pipelines and Expo Application Services (EAS), reducing manual release efforts by 60%.
- Maintained and updated the customer-facing Loupe360 iPad app, ensuring high-quality user experience and functionality.
- Mentored new engineers in code reviews and best practices, improving team productivity and code quality.
Full-stack Engineer
CloudWind
- Played a key role in the front- and back-end development of Houmti, a social media app, contributing to a 30% increase in user engagement over six months.
- Used AWS technologies like Lambda, DynamoDB, and API Gateway to create a serverless back end and reduced operational costs by 40%.
- Implemented high-impact features such as chat, polls, profile editing, and geolocation, leading to a 15% increase in daily active users.
- Streamlined code management processes by updating and maintaining internal repositories and documentation.
- Offered technical support to teammates, aiding in a 25% reduction in bug-related delays in project timelines.
Experience
Tayssir
I developed and implemented various features to enhance productivity, including detailed reports, user permission controls, alerts for inventory shortages and product expirations, and more.
Education
Master's Degree in Artificial Intelligence
University of Science And Technology Houari Boumediene (USTHB) - Algiers, Algiera
Bachelor's Degree in Computer Science
University of Science And Technology Houari Boumediene (USTHB) - Algiers, Algiera
Skills
Libraries/APIs
Node.js, React, TensorFlow, Apollo Client
Tools
Sequelize, Amazon Cognito, Expo, Fastlane
Frameworks
React Native, Material UI, Express.js, SwiftUI
Languages
TypeScript, SQL, Python 3, Java, JavaScript, GraphQL, Swift, Kotlin
Paradigms
Serverless Architecture, Compiler Design, Object-oriented Programming (OOP)
Platforms
AWS Lambda, Amazon EC2, Amazon Web Services (AWS)
Storage
Databases, PostgreSQL, Amazon DynamoDB, Amazon S3 (AWS S3)
Other
B Oracle, Heuristics, Neural Networks, Deep Neural Networks (DNNs), Deep Reinforcement Learning, Algorithms, System Design, Web Development, API Gateways, Kotlin/Native
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