SSaad Mosallam
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6+ years building production web applicationsHigh-traffic marketplace platform experienceSSR, SEO, rendering, and performance specialization

Senior Frontend Engineer building scalable React and Next.js systems.

I design and ship production-grade frontend architecture for high-traffic marketplace products, with deep focus on SSR, SEO, rendering performance, reusable UI systems, and product UX that stays fast as complexity grows.

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Skills

Next.jsReactTypeScriptSSRSEOTailwind CSS

Contact

saadmosallam@outlook.com+20 109 804 7247

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Product engineering

Experience

Frontend roles centered on scalable UI architecture, production delivery, and measurable improvements to performance, SEO, and user workflows.

  1. 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.
    • Built reusable UI systems and implementation patterns that reduce duplicated work across marketplace, booking, and communication flows.
    • Collaborated closely with backend, product, and design teams to deliver scalable user-facing features across fast-moving product initiatives.
    • Raised frontend quality through architecture reviews, refactoring, production debugging, and mentoring around scalable React patterns.

  2. 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.
    • Worked with cross-functional teams to ship features against business requirements, release timelines, and real user feedback.
    • Investigated production issues, delivered fixes, and strengthened frontend consistency across long-lived application surfaces.

Selected systems

Work that scales beyond the screen

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4Sale Marketplace Platform

Featured

High-traffic marketplace frontend work across listing, discovery, SEO, and product flows. Focused on SSR decisions, rendering optimization, metadata correctness, structured data, and reusable patterns that support a large product surface.

  • Improved crawlability and indexing signals through server-rendered metadata and structured data fixes.
  • Reduced frontend complexity by consolidating reusable UI and data-flow patterns across features.
Next.jsTypeScriptSSRSEOPerformance
Focus · Marketplace scale
Role · Senior Frontend Engineer
Stack · Next.js · TypeScript

Booking & Scheduling Systems

Production booking flows with time slots, buffer rules, availability constraints, and state-heavy UX. Built for predictable user decisions and resilient frontend behavior around real business rules.

  • Modeled scheduling constraints clearly in the UI so users can complete bookings with fewer invalid states.
  • Kept interaction paths responsive by separating server data, derived state, and local UI state.
ReactTypeScriptState ManagementUX
Focus · Complex product flow
Role · Feature architecture
Stack · React · TypeScript

Real-time Chat Systems

Communication interfaces for marketplace users, with attention to message state, responsive layouts, loading and empty states, and product details that make real-time conversations feel reliable.

  • Designed interaction states for active conversations, loading boundaries, and message feedback.
  • Built UI patterns that support high-frequency updates without making the interface feel unstable.
ReactReal-time UXArchitecture
Focus · User engagement
Role · Frontend implementation
Stack · React · Product UI

Frontend Performance & SEO Program

Cross-cutting improvements around rendering cost, search visibility, metadata quality, structured data, and Lighthouse-sensitive implementation details in a production Next.js environment.

  • Audited pages for crawlability, metadata consistency, render path quality, and unnecessary client-side work.
  • Improved implementation patterns used by future product work, not only one-off page fixes.
PerformanceSEOSSRStructured Data
Focus · Visibility and speed
Role · Optimization owner
Stack · Next.js · Web Platform

Technical positioning

Skills

A senior frontend stack grouped by the decisions I make daily: rendering, state, performance, SEO, reusable systems, and production tooling.

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

ATS keywords

Searchable technical terms mirrored in the printable CV.

  • Next.js
  • React
  • Redux
  • TanStack Query
  • TypeScript
  • JavaScript
  • HTML5
  • CSS3
  • Tailwind CSS
  • Sass
  • Flexbox
  • CSS Grid
  • Webpack
  • Git
  • SSR
  • SEO
  • Structured Data
  • Rendering Optimization
  • Core Web Vitals
  • Performance Optimization
  • Accessibility

About

Product-minded engineering with strong web fundamentals.

I work best where frontend engineering is treated as product infrastructure: the layer that shapes discoverability, speed, conversion, and daily user trust. My strongest work is in React and Next.js applications where server rendering, metadata, state boundaries, and UI architecture all need to fit together.

At 4Sale International, I contribute to marketplace experiences that need to remain understandable for users and maintainable for teams. I care about clear tradeoffs, production debugging, reusable systems, and shipping improvements that keep paying back after the first release.

Contact

Open to senior frontend roles and product teams building at scale.

Best fit: React and Next.js teams that care about architecture, performance, SEO, and thoughtful user experience.

saadmosallam@outlook.com+20 109 804 7247LinkedInGitHub