First Principles
Interview Mastery.
Learn from real interview experiences at top companies. Master the concepts, understand the questions, prepare systematically.
Real Interview Questions
From 1 verified experiences
"Design a URL shortener like bit.ly"
Learn the concepts
Browse Fundamentals BlogsTCP Deep Dive: Reliability, Flow Control, and Congestion Explained
A practical explanation of how TCP ensures reliable delivery using handshakes, sequence numbers, retransmissions, and congestion control.
TLS and mTLS Explained: How Secure Communication Actually Works
Understand TLS handshakes, certificates, encryption, and how mutual TLS enables zero-trust service-to-service authentication.
HTTP/1.1 Complete Guide
Master HTTP/1.1 fundamentals: request-response cycle, headers, methods, status codes, persistent connections, and caching strategies.
HTTP/2: Multiplexing and Server Push
Discover how HTTP/2 revolutionizes web performance with binary framing, stream multiplexing, header compression, and server push.
REST API Architectural Style
Learn REST principles, resource design, HTTP methods, status codes, HATEOAS, and best practices for building scalable APIs.
gRPC: High-Performance RPC Framework
Explore gRPC's Protocol Buffers, streaming modes, performance benefits, and when to choose gRPC over REST.
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Study in sequence.
Our curriculum-led approach ensures you have the fundamental mental models before you look at company-specific questions.