The engineering questions you get asked, and the bugs you actually hit. Drawn, one mechanism at a time, in the order the videos ship.
Why synchronous Two-Phase Commit (2PC) fails in cloud microservices, and how the asynchronous Saga pattern coordinates distributed transactions with compensating rollbacks.
How algorithm negotiation and ciphersuite confusion create critical security vulnerabilities in JWTs, and how PASETO v4 enforces modern cryptographic safety by default.
A deep dive into vector embeddings, high-dimensional cosine distance, and how Hierarchical Navigable Small World (HNSW) graph indexes achieve sub-10ms semantic search across millions of vectors.
A deep dive into distributed consensus, linearizability, PACELC theorem, and choosing between immediate consistency and high-throughput low latency.
How PostgreSQL process concurrency causes connection exhaustion, and how PgBouncer transaction pooling enables 10,000+ serverless functions to share 50 database sockets.
A comprehensive deep dive into Key-Value (KV) caching, PagedAttention memory management, and cross-request prompt prefix caching for LLM production serving.
How to eliminate heavy file upload traffic from application servers by using AWS S3 Presigned URLs and asynchronous serverless event processing.
A deep dive comparing full-duplex WebSockets, unidirectional Server-Sent Events (SSE), and asynchronous Webhook callbacks for modern web systems.
How knowledge distillation transfers dark knowledge, logits distributions, and reasoning capability from massive teacher models into compact, edge-ready student models.
How Raft consensus, heartbeat timers, and majority quorum rules ensure only one node coordinates writes and prevent irreversible state divergence.
