Saad Sleem

Full Stack Developer at SigmTech (2024-06 – Present)

Engineered and scaled robust backend systems for mobile applications using PHP (Laravel) and NestJS, designing secure, high-performance RESTful APIs and optimizing architecture for scalability and reliability.
Developed and maintained modern web applications and dashboards using React.js and Next.js, including upgrading and managing legacy Next.js dashboards with improved performance and maintainability.
Implemented multiple payment methods including Fathoorah, Tabby, Tamar, and other gateways, ensuring seamless and secure transactions.
Managed deployments across multiple environments, including Ubuntu-based VPS servers, Vercel, and automated CI/CD pipelines using GitHub Actions.
Administered and maintained live systems through hosting control panels such as Plesk and cPanel, ensuring high availability, system updates, and operational stability.

Full Stack Developer (Contract – 6 Months) at Freelance (2023-11 – 2024-06)

Developed full-stack features across frontend (React.js) and backend services for a social media platform, enabling multi-platform posting, scheduling, role-based access (7 roles), and admin/CRM functionality.
Engineered a real-time chat system using Node.js (Express), Socket.IO, and React.js, enabling multi-role communication, group creation, file uploads, and voice messaging.
Designed and implemented a task management system with features such as task assignment, priorities, badges, and group organization, inspired by Trello-style workflows.

Full Stack Developer at Mc Group (2023-07 – 2023-11)

Maintained and enhanced a legacy CodeIgniter platform for a food delivery system with three mobile applications (Customer, Restaurant, Delivery), adding new features and improving system performance.
Upgraded Flutter apps from version 2 to 3, implementing null-safety, resolving complex migration issues, and ensuring stable builds across Google Play, Apple App Store, and Huawei AppGallery, handling rejections and deployment processes.
Developed and improved Restaurant and Admin panels, adding features such as food product addons, customizable variations, order management, and delivery tracking.
Integrated payment gateways and updated UIs for legacy e-commerce modules, demonstrating problem-solving skills, independent learning.

Full Stack Developer at Innces (2022-08 – 2023-07)

Maintained and enhanced legacy PHP systems, including accounting, ERP, and hotel management applications, ensuring stability and feature improvements.
Developed and improved Law Office project frontend using Vue.js, implementing responsive and interactive UI components.
Built and supported social media mobile applications with Vue.js and Ionic, handling backend features such as posts, likes, friends, and other user interactions.

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