Manaf Al-Gharaybeh

I worked with World Online Festival (WOLF) as a Senior Front-End Developer for 2 years. My primary responsibility was leading the progressive transformation of the front-end codebase from Polymer to React with TypeScript.

Key contributions and responsibilities included:

• Modernizing the architecture by gradually embedding React components into the existing Polymer app without breaking user flows, ensuring a smooth and non-disruptive migration.
• Refactoring legacy Polymer dialogs and components into modular, reusable React components while maintaining backward compatibility where necessary.
• Transforming the data layer, replacing native JavaScript classes with a more predictable and maintainable state management approach using Recoil.
• Introducing Material UI (MUI) to standardize UI components and replace outdated plain CSS, significantly improving development speed and design consistency.
• Collaborating closely with backend and product teams to ensure seamless integration and rollout of new features.

This experience strengthened my ability to handle large-scale front-end refactoring in production environments and balance between modernization and business continuity.

I worked on a Demand-Side Platform (DSP) project, a technology platform that enables advertisers to buy and manage digital ad inventory across multiple ad exchanges, supply-side platforms (SSPs), and other sources.

Key responsibilities and contributions included:

• Collaborated cross-functionally with product managers, designers, and developers to build intuitive, efficient, and visually appealing user interfaces.
• Developed and maintained the front-end codebase using technologies such as Ember.js and Cypress for end-to-end testing.
• Ensured code quality by writing clean, well-documented, and maintainable code aligned with industry standards and best practices.
• Played a role in optimizing UI performance and ensuring accessibility across various devices and platforms.
• Contributed to improving the development workflow, introducing enhancements and automation where possible to boost team efficiency.

I worked as a Senior Front-End Developer at Runa HR, a cloud-based payroll and human resources platform designed to improve the way employees work across Latin America.

Key responsibilities and achievements:

• Played a key role in modernizing and maintaining the front-end architecture using React, with a strong focus on performance, scalability, and maintainability.
• Contributed to the transition from JavaScript to TypeScript, improving type safety and reducing bugs across the codebase.
• Utilized React Hooks, React Query, and Redux to manage complex state and asynchronous data flows efficiently.
• Leveraged Immutable.js for predictable state updates and Styled Components for scalable, component-based styling.
• Wrote and maintained unit tests using Jest and React Testing Library, ensuring high test coverage and reliability.
• Participated in CI/CD processes using tools like CircleCI and CodeClimate to maintain code quality and automate testing pipelines.

Tech Stack:
React, Redux, React Hooks, React Query, Immutable.js, Styled Components, TypeScript, Jest, React Testing Library, CircleCI, CodeClimate