Saad Mosallam

Senior Frontend Engineer with 6+ years building high-performance React and Next.js products across App Router and Pages Router codebases. Specialized in SSR strategy, rendering optimization, SEO-driven architecture, structured data, reusable UI systems, marketplace flows, booking systems, and real-time communication UX.

1. Nov 2023 – Present

   Senior Frontend Engineer

   4Sale International Co. · Full-time

   Cairo, Egypt · Hybrid

   Next.jsTypeScriptSSRSEOPerformance

   • Led frontend delivery for a high-traffic marketplace platform using Next.js across App Router and Pages Router surfaces.
   • Improved rendering performance through SSR strategy, component boundaries, data-loading decisions, and reduction of avoidable client work.
   • Resolved SEO and indexing gaps by strengthening metadata, structured data, canonical server-rendered output, and crawl-friendly page architecture.
   • Collaborated closely with backend, product, and design teams to deliver scalable user-facing features across fast-moving product initiatives.
2. Apr 2020 – Nov 2023

   Frontend Engineer

   Cegedim Egypt · Full-time

   Cairo, Egypt · Hybrid

   ReactJavaScriptWebpackHTML/CSSUI Systems

   • Built and maintained responsive React applications used in production business workflows.
   • Improved UI reliability and performance by simplifying component structure, isolating state, and reducing unnecessary re-renders.
   • Developed reusable components and modular frontend patterns that made product screens easier to extend and maintain.

• 4Sale Marketplace Platform

  High-traffic marketplace frontend work across listing, discovery, SEO, and product flows, focused on SSR decisions, metadata correctness, structured data, and reusable architecture.

• Booking & Scheduling Systems

  Production booking flows with time slots, buffer rules, availability constraints, and state-heavy UX for complex business rules.

• Real-time Chat Systems

  Marketplace communication interfaces with careful message state, loading boundaries, responsive layouts, and high-frequency update patterns.

Frontend

React, Next.js, TypeScript, JavaScript, HTML5, CSS3

Architecture

App Router, Pages Router, SSR strategy, Reusable UI systems, Frontend architecture decisions

Performance & SEO

Rendering optimization, Core Web Vitals, Structured data, Metadata, Indexing, Accessibility audits, Lighthouse optimization

Tooling

Webpack, Git, ESLint, Lighthouse, Production debugging

Styling

Tailwind CSS, Sass, CSS Grid, Flexbox, Responsive UI

State Management

Redux, TanStack Query, Server/client state boundaries

1. 2013 – 2019

   Bachelor of Engineering — Computer Science & Engineering

   Faculty of Electronic Engineering, Menoufia University

2. Jul – Aug 2018

   Front-end web development internship

   Information Technology Institute (ITI)