Kareem Mohamed

I've built backend systems for Cyrus Technology and United Media Services across FinTech, retail management, e-invoicing, government initiatives, national competitions, and SaaS products.

At United Media Services, I built the backend for Dawlet El Telawa, a national competition platform that handled 400,000+ registrations in one week, with fraud prevention, secure voting, and rate limiting. I also delivered services for Alamein Festival, Resala, UMA E-Learning, UMS Podcast, and other media platforms.

At Cyrus Technology, I led development of an offline-first Retail Management System and integrated the Fawry POS Payment SDK, passing production certification on the first submission. I've also helped modernize a legacy WinForms e-invoicing application into WPF MVVM and migrate ETA e-invoicing to a multi-tenant SaaS architecture.

I design maintainable, high-performance systems using Laravel, Redis, Laravel Octane, Reverb, queues, real-time communication, and secure multi-tenancy. My work includes modular monolith architecture, high-concurrency IoT communication, wallet tracking, geofencing, KYC, and third-party integrations.