Senior Full-Stack Engineer

Hi, I'm SEIF HOSSAM

Senior Full-Stack & Mobile Engineer who designs and ships production software end-to-end — from architecture and APIs to apps live on Google Play. I build offline-first mobile apps and scalable web platforms with React, React Native, Laravel and Firebase.

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SEIF HOSSAM - Senior Full-Stack & Mobile Engineer

Experience & Approach

2023 — Present Freelance

Senior Full-Stack & Mobile Engineer

  • Architected, built and published VOLT FIT — an offline-first fitness & coaching app (React Native, Zustand, Firebase) live on Google Play.
  • Delivered client websites and web platforms end-to-end, including Farida Marketing Agency.
  • Own the full lifecycle: requirements & system analysis, architecture, API design, deployment and post-launch support.
  • Build bilingual English/Arabic (RTL) products with a focus on performance, security and SEO.

Architecture First

I start from data models, sync strategy and failure cases — so the product scales without rewrites.

Ship to Production

Real users, real stores, real deadlines. I own releases, monitoring and the fixes that follow.

Maintainable Code

Clear structure, typed contracts and validation everywhere — code the next engineer can extend.

Technical Expertise

React Native & Expo

  • Cross-platform apps from one codebase
  • Complex multi-screen navigation (24+ screens)
  • Native performance & smooth animations
  • Google Play release & update workflow

State & Offline-First

  • Zustand state architecture
  • Local persistence with background sync
  • Real-time Firestore listeners
  • Resilient UX on poor connections

Firebase

  • Firestore data modeling
  • Authentication & role-based access
  • Real-time listeners & encrypted chat
  • Security rules & hosting

React.js

  • Component architecture & reusable UI
  • State management (Context, Zustand)
  • SPA routing & data fetching
  • Performance optimization

Angular & TypeScript

  • Typed, OOP-based application design
  • Reactive forms & validation
  • Services & API integration
  • JWT authentication flows

Web Platform

  • Responsive, accessible interfaces
  • Bilingual EN/AR & RTL layouts
  • Technical SEO & structured data
  • UI/UX design handoff

PHP & Laravel

  • RESTful API design
  • Authentication, middleware & authorization
  • Eloquent ORM & MVC architecture
  • Input validation & web security

Data

  • Relational schema design (MySQL)
  • NoSQL modeling (Firestore)
  • Query optimization & indexing
  • Data migration & integrity

Architecture & Delivery

  • System analysis, ERDs & use cases
  • API contracts & integration design
  • Git workflows & CI/CD (GitHub Actions)
  • Deployment & hosting (Firebase, Hostinger)

Featured Work

VOLT FIT — Fitness & Coaching Platform

Production fitness & coaching app live on Google Play. I owned it end-to-end: product architecture, offline-first data layer with real-time Firebase sync, Zustand state design, 24 screens, workout tracking with PR detection, macro nutrition tracking, 1RM calculator, and a coach–client system with encrypted chat.

Read Case Study Download App Watch on TikTok Privacy Policy
React Native Expo Zustand Firebase Offline-First
VOLT FIT home dashboard VOLT FIT live workout tracking with rest timer VOLT FIT nutrition and macro tracking VOLT FIT coach dashboard
Farida Marketing Agency

Client project delivered end-to-end for a full-service advertising agency: a high-impact, cinematic dark-themed site, fully responsive and optimized for speed and search.

Open Project
HTML5/CSS3 Responsive Design Performance
E-Commerce Seller Dashboard

Seller analytics dashboard in React: real-time data visualization, inventory state management and responsive sales reporting built on reusable chart components.

React Chart.js CSS Modules

How I Can Help

Mobile Apps

  • Android & iOS apps with React Native
  • Offline-first data & real-time sync
  • Store publishing and ongoing releases

Web Platforms

  • Business websites & dashboards
  • REST APIs and admin systems
  • Bilingual EN/AR, SEO-ready builds

Technical Consulting

  • System analysis & architecture
  • Database and API design reviews
  • Turning ideas into a delivery plan