Modern applications rely on seamless communication between servers, services, and clients — and mastering backend communication is key to building scalable, secure, and efficient systems. Mastering Backend Communications & Protocols: Patterns, Security & Performance is a complete guide that takes you through every layer of backend communication, from the fundamentals of design patterns to the intricacies of network protocols and real-world performance tuning.

The course begins with the foundational principles of backend communication design. You’ll explore common communication patterns such as request–response, asynchronous messaging, push mechanisms, polling, long polling, and server-sent events. You’ll also learn advanced models like Publish–Subscribe (Pub/Sub), multiplexing, and sidecar patterns — crucial for designing microservices and distributed architectures. By mastering these techniques, you’ll gain the confidence to design systems that handle high traffic while maintaining reliability and scalability.

Next, you’ll dive into the world of backend protocols and how data flows through the network stack. You’ll understand the OSI model, Internet Protocol (IP), UDP, TCP, and TLS — along with modern web technologies such as HTTP/2, HTTP/3, WebSockets, gRPC, and WebRTC. Each concept is explained in the context of performance, latency, and security, giving you a real-world understanding of how backend systems operate under the hood.

You’ll then explore HTTPS variants and learn how modern encryption protocols — including TLS 1.2, TLS 1.3, QUIC, and 0-RTT — affect both security and speed. The course also examines backend execution patterns, process-thread models, connection handling, and socket communication. Finally, you’ll gain practical insights into proxying and load balancing, comparing Layer 4 and Layer 7 strategies to build fault-tolerant and high-availability architectures.

By the end of this course, you’ll not only understand the theory behind backend communications but also know how to apply it in practice — designing backend infrastructures that are secure, scalable, and built for performance. Whether you’re optimising an existing system or architecting a new one from scratch, this course gives you the deep technical foundation needed to succeed in modern software development.