System Status: Available for new opportunities

Mohamad Maarouf

Software Engineer specializing in scalable backend systems, secure infrastructure, and enterprise architecture.

View Featured Project View Resume

Spring Boot

PostgreSQL

Security & OAuth

DevOps & Cloud

Featured Work

Tourongo

Production

A trust-first, Halal-friendly travel marketplace connecting travelers with verified local guides in Lebanon and Turkey. Built to handle complex, concurrent booking workflows.

Stateless JWT auth with HttpOnly refresh token rotation + Google OAuth2
Role-based access control (Traveler / Guide / Admin) with method-level security
Pessimistic locking on booking operations to prevent race conditions
Deterministic FIFO waitlist engine that auto-promotes travelers
15-minute cart lock preventing double-booking during payment
Tiered cancellation refund engine (>48h full / 24-48h 50% / <24h none)
QR handshake check-in system triggering 48h payout escrow
Dynamic pricing engine (weekend/holiday multipliers + group discounts)
Loyalty tier system (Bronze → Silver → Gold) with automatic upgrades
Bulk email broadcast system (Brevo REST API) with admin controls

Java Spring BootNext.jsReactPostgreSQLDockerOracle CloudWebSockets

Visit Tourongo.com View Source Code

System Architecture

Client / BrowserNext.js

Cloudflare WAF & DNS

Spring Boot APIDocker

PostgreSQL 15

Technical Arsenal

I specialize in building robust backend services and mapping them to dynamic frontends. Here is the stack I use to ship production-ready software.

Backend Core

Java 17
Spring Boot
Spring Security
JPA / Hibernate

Data & Infrastructure

PostgreSQL 15
Docker & Compose
Oracle Cloud VMs
Redis

Frontend & Web

Next.js 16
React
TypeScript
Tailwind CSS v4

Security & Tools

OAuth2 / JWT
Cloudflare WAF
GitHub Actions
Nginx