GuruHub
Learn anything, anywhere — expert video courses, quizzes, and analytics in one platform.
Overview
Designed and implemented GuruHub, a full-stack educational platform including backend services, an admin dashboard, and a mobile application. Built backend services using cutting-edge Spring Boot 4.0.1 + PostgreSQL, exposing 168 secure REST APIs. Developed a Flutter mobile application and a web dashboard for administration and analytics. Implemented enterprise-grade mobile security, single-device session enforcement, and role-based access control. Deployed using Docker and CI/CD pipelines. Note: GuruHub is currently in an internal testing phase. Please get in touch to be invited to the staging environment.
Responsibilities
- Designed and implemented GuruHub, a full-stack Learning Management System platform
- Built enterprise-grade mobile security including freeRASP device integrity, Firebase App Check, SSL Pinning, and screenshot prevention
- Built modular backend services using Spring Boot 4.0.1 (Spring Modulith) and PostgreSQL
- Exposed 168 secure REST API endpoints for mobile and web clients
- Implemented a commercial plan system with AOP-based feature gating (@RequiresCapability)
- Built event-driven push notification system using Spring Application Events + Firebase Cloud Messaging
- Designed quiz engine with deterministic randomization, timed attempts, and re-enrollment model
- Implemented student progress tracking with real-time playback position sync and course completion analytics
- Developed a Flutter mobile application following Clean Architecture
- Developed a web dashboard using Vue 3 and Vuetify for administration and analytics
- Implemented authorization with Spring Security roles + AOP plan capability on the backend and CASL on the frontend
Technical Challenges
Quiz integrity during concurrent attempts
Deterministic shuffle using attempt ID as seed + unpublish guard blocking while live attempts exist
Students always see consistent question order on resume
Single-device enforcement for students taking quizzes
Built a device registration and validation flow using X-Device-Id headers and admin-approved device resets.
Prevented unauthorized account sharing and ensured academic integrity.
Feature gating across 4 commercial plans
Built AOP aspect with @RequiresCapability annotation + plan resolution chain (agency → user → denied)
Zero-code feature toggling per plan tier
Cross-module data access in modular monolith
Enforced module boundaries via PublicService interfaces + Spring Modulith dependency rules
Clean architecture with testable module contracts
App performance and update management
Integrated Shorebird for continuous OTA updates and freeRASP for device integrity checks.
Secure application with zero-downtime updates for critical fixes.
Results & Impact
Tech Stack
Gallery
Key Features
- Expert video courses & comprehensive Course Builder
- Standalone quizzes & reusable question banks
- Offline downloads for on-the-go learning
- Cross-device progress tracking (Resume anywhere)
- Admin, Agency & Instructor analytics dashboards with student management
- In-app direct messaging between instructors and students
- Free course previews before enrollment
- Enterprise-grade mobile security with single-device enforcement
- i18n bilingual support (English + Arabic with RTL layouts)
- Modular Monolith Backend exposing 168 secure API Endpoints
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