System design
A shop ledger page, 1899. Every line adds up.
How to Integrate a Third-Party API into an Existing App
Plan a third-party API integration around authentication, contracts, rate limits, idempotency, monitoring, and recovery.
2 min read
HLD Fundamentals for Beginners: Estimation, Building Blocks and a Payments Lens
A beginner-friendly system design primer: the 6-step framework, back-of-envelope QPS math, L4 vs L7 load balancing, caching, databases, queues, reliability patterns and how a payment flows end to end.
7 min read
How to Design Reliable Background Jobs for a Web Application
Move slow work out of request handlers with a queue, idempotent tasks, bounded retries, status tracking, and observability.
2 min read