Payment System Design: Ledger, Idempotency, and Settlement
How to design a Stripe-style payment system that never charges twice, keeps an auditable ledger, and reconciles every dollar
Search across 253 posts, 23 explainers, and 84 topics
Designing Database Isolation for B2B Multi-Tenant SaaS
Shared schema, schema-per-tenant, and database-per-tenant compared, plus how PostgreSQL RLS, tenant context, and hybrid tiers keep customer data safe
Request Pipeline Pattern in Distributed Systems
Why one-request-at-a-time wastes your network, and how sending many requests without waiting for replies cuts latency and lifts throughput
Consistent Core Pattern in Distributed Systems
How a small, strongly consistent cluster lets a huge data cluster coordinate itself without drowning in consensus
CDN System Design: How Content Delivery Networks Work
How edge servers, anycast routing, and tiered caching move content close to users, cut latency, and protect your origin at global scale
How to Use Cursor: 12 Tips to 10x Your Productivity
A practical guide to using Cursor, the AI code editor: master Tab, Cmd+K, Chat, Agent, Plan Mode, Rules, Skills, and MCP to ship code faster
Cursor Skills: How to Create and Use Agent Skills
A practical guide to Cursor Agent Skills: write your first SKILL.md, scope it with paths, add scripts, and ship reusable workflows your AI agent runs on demand
Leader and Followers Pattern in Distributed Systems
How one elected leader coordinates replication so a cluster stays consistent and survives node failures
Git Flow vs GitHub Flow
How each Git workflow handles features, releases, and hotfixes, and how to pick the one that fits your team
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
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
