Toka Ismail Abdelaal

• Developed and shipped RESTful API endpoints across multiple modules using Node.js, Express.js, and NestJS, following Clean
Architecture principles.
• Reduced average response time on high-traffic, multi-tenant endpoints by ~35-40% through Redis caching (TTL + invalidation
strategies), database indexing, and query optimization.
• Built authentication and authorization systems using JWT, RBAC, custom Guards, and OTP verification, securing access across
multiple tenant roles.
• Integrated Firebase push notifications, SMS services, and payment gateways into production workflows, cutting manual
notification-handling errors.
• Designed and maintained background job pipelines with Bull, BullMQ, and Agenda.js for scheduled and async processing (e.g.,
route generation, auction closing).
• Developed real-time features using Socket.io for live status updates across the platform.
• Worked across PostgreSQL, MySQL, and MongoDB (via Prisma ORM and Mongoose) in a polyglot-persistence, multi-tenant
environment.

• Developed RESTful APIs for a freelancing platform connecting clients and freelancers.
• Designed scalable MongoDB database structures and implemented modular authentication systems.

• Built RESTful APIs using Node.js and Express.js; optimized MongoDB schemas and backend performance.