Idempotent Receiver Pattern in Distributed Systems
Why clients retry, how duplicate requests sneak in, and how to build a receiver that processes the same request twice without breaking anything
Search across 238 posts, 23 explainers, and 80 topics
ULID Explained: How Sortable Unique IDs Work
Why teams pick ULIDs over UUIDs for database keys, and how to generate and decode them
Auth0 vs Okta: How to Pick the Right Identity Platform
Two products, one parent company, very different jobs. Pricing, SDKs, SSO, SAML, MFA, and when each one is the right call.
Notification System Design: Push, SMS, Email at Scale
The architecture behind Slack alerts, Uber ride pings, and every order confirmation email that lands on time
PostgreSQL MVCC and Autovacuum Explained
How dead tuples cause table bloat, why default autovacuum settings fall behind on busy tables, and how to tune it for high-traffic production workloads
Lease Pattern in Distributed Systems Explained
How time-bound leases give cluster nodes exclusive access without holding it forever when things go wrong
Flash Sale System Design: Architecture, Scale, and Oversell
The architecture behind Flipkart Big Billion Days, Xiaomi drops, Alibaba Singles' Day, and every Black Friday landing page that does not melt
What Is a GUID? How to Generate One in C# and SQL Server
What a GUID is, how the format works, and how to generate a GUID in .NET, SQL Server, and PowerShell
Debezium and the Outbox Pattern: The Real Impact on Your Postgres Database
What logical decoding, replication slots, and the WAL actually cost when you stream the outbox table to Kafka with Debezium
Design TinyURL: System Design Interview Guide for URL Shorteners
How services like TinyURL, Bitly, and goo.gl turn long links into 7-character codes and serve billions of redirects a day
How Git Stores Data Internally: The Object Model Explained
A practical walk through blobs, trees, commits, the index, refs, and pack files, with hands-on commands you can run today
Vector Database Deep Dive: How They Actually Work
An engineer's guide to embeddings, ANN search, HNSW, IVF, and choosing between pgvector, Pinecone, Qdrant, Weaviate, and Milvus
Saga Pattern Explained: Distributed Transactions for Microservices
A practical guide to choreography, orchestration, compensating transactions, and the production traps that come with running sagas at scale
How GitHub Stores and Serves Git Repositories
Inside Spokes, the three-replica system that keeps half a billion repositories online for a hundred million developers
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