Cloud object storage is how modern apps store files at scale. Learn how it works, compare AWS S3 vs Google Cloud Storage vs Azure Blob pricing and features, and master presigned URLs, lifecycle policies, and versioning.
Language models process tokens, not words. Learn how BPE tokenization works, what the context window really is, and how the KV cache speeds up generation — with real pricing comparisons across OpenAI, Anthropic, and Google.
Observability rests on three pillars: logs, metrics, and traces. Learn what each pillar does, how to instrument them, the RED and USE frameworks, and how to choose an observability platform without blowing your budget.
Event-driven architecture decouples services through message brokers like Kafka, RabbitMQ, and SNS/SQS. Learn when EDA is the right choice, how to implement it, and the patterns that make it work in production.
An honest comparison of JWT and session token authentication. Covers JWT structure, signing algorithms (RS256 vs HS256), common vulnerabilities, the revocation problem, and when each approach is the right choice for your architecture.
A complete guide to PostgreSQL index types. Learn when to use B-Tree, Hash, GIN, GiST, BRIN, and partial indexes with real SQL examples, EXPLAIN ANALYZE verification, and index maintenance strategies.
Build the mental model for Linux file permissions from scratch. Learn chmod octal and symbolic notation, chown, umask, setuid/setgid/sticky bits, and POSIX ACLs with real-world scenarios.
Go beyond basic GitHub Actions: composite actions, reusable workflows, secret passing, dependency caching, matrix builds, and permission lockdown patterns you can apply immediately.
DNS translates domain names into IP addresses in milliseconds. Trace the full resolution chain step by step, learn every record type, and debug common failures like NXDOMAIN and SERVFAIL.
Kubernetes complexity concentrates in three core objects: Pods, Deployments, and Services. This visual guide explains what they do, how they connect, and what happens during rolling updates.
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