Mahmoud Kassab

Built and scaled high-throughput proxy systems handling 1M+ concurrent connections and terabytes of traffic daily at 99.999% uptime. Led on-call incident response, resolving production issues in 5–10 min across customer networks in dozens of countries. Built an embeddable SDK powering Proxidize's distributed proxy network. Drove core architecture decisions balancing cost and scalability. Forked quic-go to implement a custom congestion control algorithm, improving performance by up to 70%.

- Developed and maintained secure and optimized digital wallet solutions, ensuring reliability and compliance with industry standards. - Built a fully operational push notification system using Firebase Cloud Messaging (FCM), enabling targeted, scheduled campaigns that drove a measured 10% increase in user engagement/sales.

Integrated the trading platform with multiple Liquidity Providers (LPs) via FIX and WebSocket protocols, ensuring reliable, low-latency market connectivity. Designed and implemented microservices powering the core infrastructure of a high-frequency trading platform. Maintained open-source SDKs following best practices and documentation standards. Managed and mentored interns, enabling them to contribute directly to production codebases.

Developed backend features for an EdTech platform, collaborating with product managers, designers, and developers to translate requirements into working software. Shipped features under tight deadlines in a fast-paced startup environment. Refactored parts of a complex legacy codebase, reducing technical debt while maintaining existing functionality.