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Achievement: Pull SharkAchievement: YOLO

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Achievement: Pull SharkAchievement: YOLO

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MahmoudYoussef-web/README.md

Mahmoud Youssef

Backend Engineer — Java 21 · Spring Boot 3

I build reliable backend systems with a focus on concurrency control, transactional consistency, distributed architecture, and secure API design.

Tech Stack

Backend Java 21 · Spring Boot 3 · Spring Security

Data PostgreSQL · MySQL · Spring Data JPA · Hibernate · Raw JDBC

Caching Redis (Cache-Aside · Rate Limiting · Atomic ID Generation)

Payments Stripe Checkout · Webhook Ingestion (HMAC-verified)

Infrastructure Docker · Docker Compose · GitHub Actions CI/CD

Testing & Docs JUnit 5 · Mockito · SpringDoc OpenAPI

Expertise

  • Distributed Systems
  • Concurrency Control (Pessimistic / Optimistic Locking)
  • Transactional Consistency & Idempotency
  • Authentication & Authorization (JWT, RBAC, Token Rotation)
  • Event-Driven Architecture
  • Caching & Rate Limiting
  • Payment Integration
  • API Design

Engineering Principles

  • Design for correctness before optimization.
  • Keep business logic independent from infrastructure.
  • Prefer explicit consistency over hidden side effects.
  • Build systems that remain predictable under concurrent workloads.

Portfolio

Architecture write-ups and implementation details: Portfolio

📫 mahmoudyoussef29@gmail.com · LinkedIn · Open to remote opportunities

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  1. logibridge-backend logibridge-backend Public

    Production-grade delivery integration platform. Spring Boot 3 · JWT + Refresh Token Rotation · RBAC · Idempotency · Pessimistic Locking · PostgreSQL · Docker

    Java 1

  2. url-shortener-system url-shortener-system Public

    Distributed URL shortener with hash-based sharding, Redis atomic ID generation, Lua rate limiting, and cache-aside reads. Spring Boot · MySQL · Redis · Docker

    Java 1

  3. bloodbridge-api bloodbridge-api Public

    Spring Boot REST API matching blood donation requests to eligible donors — geo-radius broadcast, QR-verified admission, JWT auth, ML-assisted donor scoring.

    Java 1

  4. calorie-tracker-backend calorie-tracker-backend Public

    Production-ready REST API for intelligent nutrition tracking with AI-powered food recognition 🍽️

    Java 2

  5. attendance-management-api attendance-management-api Public

    Production-grade Attendance Management API with QR check-in, JWT auth, RBAC, and Spring Boot

    Java 1

  6. ecommerce-backend ecommerce-backend Public

    Production-grade E-commerce backend built with Spring Boot 3, featuring JWT authentication, Stripe payments, event-driven architecture, inventory reservation system, and multi-tenant support with s…

    Java 2