30 System Architecture
Deep-Dives

How Netflix streams to 260M users without a single datacenter

The push vs pull dilemma at 500M tweets/day

H3 hexagonal indexing, real-time dispatch, and dynamic pricing

How 50 engineers built a system bigger than Twitter

How Google indexes the entire web in seconds

The Dynamo paper that changed distributed databases forever

From upload to global streaming in minutes

Geo-search, ML ranking, and real-time availability at scale

Idempotency, event sourcing, and double-entry ledgers

How Discord scaled from 5M to 500M users with Elixir and Rust

Collaborative filtering, Discover Weekly, and the AudioEmbeddings pipeline

Git internals, check suites, and the webhook fanout that powers DevOps

Heavyweight ML scoring with online/offline feature pipelines

Delta sync, content-addressing, and conflict resolution

The Associations & Objects model powering 2B people

Hash slots, gossip protocol, and replication without a coordinator

Partitions, consumer groups, log compaction, and exactly-once semantics

etcd, the scheduler, controller loops, and service mesh

How Postgres achieves ACID transactions with multiversion concurrency

Anycast routing, V8 isolates, and KV at the edge

KV cache, FlashAttention, quantization, and batching at scale

Retrieval-Augmented Generation from PDF to production

HNSW, IVF, and ANN search at billion scale

Rate limiting, token tracking, model routing, and cost management

LangGraph state machines, tool use, memory, and human-in-the-loop

LoRA, QLoRA, DPO, and the production training infrastructure

PagedAttention, prefix caching, and speculative decoding

BM25 + dense vectors, RRF reranking, and query expansion

Constitutional AI, RLHF, input/output filters, and red-teaming

vLLM, tensor parallelism, Triton Inference Server, and autoscaling