I'm Eng. Sayed Herzallah

Full Stack Developer
(Backend Focused)
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Sayed Herzallah

I am a Backend-Focused Full-Stack Developer specializing in Node.js, Express, and database engineering. I translate complex requirements into clean, optimized, and production-ready APIs.

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01 // About Me

My Story & Philosophy

I am a Backend-Focused Full-Stack Developer specializing in Node.js, Express, and database engineering (MySQL/MongoDB). Selected as one of 5,000 developers for Google's Build with AI: Masr Edition, I focus on building high-performance RESTful APIs and real-time systems using clean layered architectures.

I design relational schemas using Sequelize and optimize MySQL indexes to reduce query latency. Simultaneously, I construct optimized MongoDB documents utilizing cursor-based pagination to support large-scale feed retrievals under sub-10ms latency thresholds.

By applying clean architectural patterns (Controller → Service → Model), I decouple business logic from transport layers, ensuring that APIs are highly testable, secure, and maintainable. I also build responsive frontends in React and TypeScript to consume backend APIs cleanly.

Recent work includes architecting concurrent travel booking transaction systems, building WebSockets-driven chat engines, and deploying production-ready full-stack applications with integrated AI capability layers.

Completed Projects
8+
Public Repos
40+
Training Hours
350+
University Degree
B.Sc.
Sayed Herzallah
02 // Featured Work

Selected Applications

A curated selection of applications representing clean architecture, pixel-perfect layout, and solid engineering.

Ataa Charity Platform

Ataa Charity Platform

A production-grade full-stack charity ecosystem enabling transparent donations, real-time impact tracking, campaign management, and AI-driven insights.

ReactTypeScriptNode.js+9 more
Live Demo Code
R3aya – Child Physiotherapy Monitoring System API

R3aya – Child Physiotherapy Monitoring System API

Scalable healthcare backend system for managing child physiotherapy sessions, EMG assessments, and connecting parents with specialists through a secure digital platform.

Node.jsExpress.jsMongoDB+6 more
Code
Social Media Platform Real-time API

Social Media Platform Real-time API

High-performance backend API supporting complex social graph relationships (followers/following), real-time communication via WebSockets, and scalable feed retrieval using cursor-based pagination for infinite scroll.

Node.jsMongoDBMongoose+3 more
Code
Siwa Oasis Travel Platform API

Siwa Oasis Travel Platform API

Production-ready REST API for a tourism platform — handling user authentication, destination browsing, custom trip planning, bus booking with cancel/confirm flows, chatbot with session history, and admin reporting.

Node.jsExpress.jsSequelize+3 more
Code
02 // Supplementary Work

Additional Applications

Sharaha App – Anonymous Messaging API

Secure and scalable backend API for an anonymous messaging platform supporting authentication, encrypted communication, and message management.

Node.jsExpress.jsMongoDB+8

AI-Integrated URL Analysis Dashboard

Full-stack dashboard application with deployed frontend and backend. Integrates an AI layer for real-time URL analysis and insight generation. Features responsive UI with dynamic data visualization.

React.jsNode.jsFetch API+2

Brain Tumor AI Analysis Medical Web App

Transformed a complete 17-screen mobile UI design into a structured React application simulating a real-world medical platform — covering patient registration, MRI scan upload, medical history search, and chat interface.

React.jsContext APICustom Hooks+2

Blog Platform Backend (Sequelize)

Scalable backend API for a blog platform with user authentication, posts management, and relational database structure using Sequelize ORM.

Node.jsExpress.jsSequelize+2

UFUQ Real Estate Platform

Modern responsive real estate web platform built with React, enabling users to explore property listings, view statistics, and interact with an intuitive UI experience.

ReactContext APICSS3+1

Villa Agency React Frontend

React application for a real estate agency with full CRUD, authentication, responsive animations, and live Vercel deployment. Built as a graduation project for MCIT Creativa Innovation Hub.

React.jsCRUDAuth+2
03 // Skills & Stack

Technical Expertise

A comprehensive breakdown of technologies, methodologies, and core professional competencies.

Frontend Development

React.js
Next.js
TypeScript
JavaScript (ES6+)
Redux Toolkit
Context API
Tailwind CSS
Framer Motion
HTML5 & CSS3

Backend Development

Node.js
Express.js
RESTful APIs
JWT Authentication
Socket.io (Real-time)
Clean Layered Architecture
MVC Pattern

Databases & Storage

MongoDB
Mongoose ODM
MySQL
Sequelize ORM
Relational Database Design
Database Normalization

Tools & DevOps

Git & GitHub
Docker
Postman
Swagger / OpenAPI
Jest (Testing)
Redis (Caching)
Vercel / Railway
04 // Timeline & Credentials

Experience & Education

A comprehensive history of professional software engineering execution, academic degrees, and credentials.

Backend Software Engineer (Contract / Freelance)

Self-Employed

Jan 2025 – Present
  • Architected and deployed the Siwa Oasis Travel booking engine API utilizing Node.js, Express.js, and Sequelize, reducing database query latencies by 30% through optimized MySQL indexing and relational normalization.
  • Engineered a secure session-based AI chatbot integration (Gemini API) featuring transaction state tracking, handling concurrent booking workflows without state pollution.
  • Implemented clean Service-Layer Architecture (Controller-Service-Model), decoupling business logic from transport layers to improve code testability and reuse by 45%.
  • Integrated a full-stack URL analysis system handling asynchronous background extraction pipelines with secure API authentication keys.
Node.jsExpress.jsSequelizeMySQLAI IntegrationClean Architecture

Software Engineer (MERN Stack Track)

NTI - National Telecommunication Institute

Aug 2025 – Jan 2026
  • Designed and built a high-throughput Social Media API utilizing Node.js, Express, and MongoDB, modeling complex social graphs (follower/following relationship models).
  • Implemented real-time bidirectional messaging features via WebSockets (Socket.io), reducing messaging latency to sub-100ms.
  • Optimized feed retrieval performance for infinite scroll by implementing cursor-based database pagination, preventing memory overhead issues associated with standard offset pagination.
  • Secured user sessions using JWT authentication and applied Joi sanitization schemas to defend against XSS and NoSQL injection attacks.
Node.jsExpress.jsMongoDBSocket.ioCursor PaginationJWTJoi

Full Stack Developer (Training Program)

Creativa Innovation Hub — Ministry of Communications (MCIT)

Nov 2025 – Feb 2026
  • Completed an intensive full-stack development program covering React.js, Node.js, REST API design, and database integration.
  • Built and deployed a React.js client for a real estate platform, implementing authentication, CRUD operations, responsive UI, and Postman-documented API contracts.
  • Developed a Brain Tumor AI Analysis medical web app — translating a 17-screen high-fidelity mobile design into a responsive React component structure utilizing Context API and custom hooks.
React.jsContext APIREST APIsResponsive Design
05 // Contact

Get In Touch

Have an exciting opportunity, a project proposal, or just want to chat? Drop a message below!

Contact Information

Feel free to reach out via email or WhatsApp. I usually respond within 24 hours.

Email Me
herzallahdeveloper@gmail.com
WhatsApp Me
+20 155 858 5258
Location
Cairo, Egypt (Open to Remote / Gulf Market)
* Secure communication enabled.