Kareem Morsi

Generalist Software Engineer specializing in TypeScript, PostgreSQL, SQL, Node.js, and React, with a strong focus on database performance, backend systems architecture, and responsive web applications. Passion- ate about solving complex engineering problems—from low-latency query optimization and strict relational data modeling to asynchronous job pipelines and automated Linux/Docker deployments—with a commitment to code quality and empirical load testing.

Portfolio

Project Title:
GymFlow — Offline-First Multi-Tenant Gym Management Platform & QR Attendance SaaS
Overview:
GymFlow is a modern, high-performance B2B SaaS platform designed to eliminate physical membership cards and prevent subscription fraud for fitness centers. I engineered the entire solution end-to-end, delivering a multi-tenant cloud architecture that operates seamlessly even during total internet outages.
Key Challenges & What I Built:
Fraud-Proof QR Attendance: Implemented a real-time, time-rotating cryptographic QR engine (refreshes every 75s) displayed on reception screens, making it impossible for members to share screenshots or pass cards to friends.
Offline-First PWA (Zero Downtime): Built using Service Workers and IndexedDB, allowing front-desk reception to process check-ins uninterrupted when gym Wi-Fi drops, automatically syncing back to the database upon reconnection.
Strict Multi-Tenant Architecture: Designed database-level tenant isolation using PostgreSQL and Prism