The Queries That Get Slow at Scale, and Why
N+1s, missing indexes, unbounded results and the ORM conveniences that quietly stop scaling. Diagnosis and fixes with the reasoning behind them.
9 min read
50 articlesNotes from
Notes from
building things.
What we have learned shipping AI systems, SaaS platforms and industry software — including the parts that went wrong. Written by Purushottam Kumar Suman.
LatestEngineering
The Strangler Pattern in Practice: Replacing a System Without Stopping It
Big-bang rewrites fail for reasons that are structural, not managerial. How to route traffic away from a legacy system feature by feature, reversibly.
Purushottam Kumar Suman10 min read
Zero-Downtime Deploys That Actually Work
Rolling releases are the easy half. The hard half is database migrations, and that is where most 'zero-downtime' pipelines quietly fail.
9 min read
What Server Components Actually Changed
Beyond the discourse: where the rendering boundary belongs, what it does to bundle size and data fetching, and the mistakes that follow from misplacing it.
9 min read
API Versioning Without Breaking Anyone
Additive change, deprecation policies you can enforce, and usage telemetry that tells you when it is genuinely safe to remove an endpoint.
8 min read
Idempotency: The Habit That Prevents Double Charges
Networks retry, users double-click, queues redeliver. The single most valuable defensive pattern for any endpoint that moves money or creates records.
7 min read
Observability Beyond Dashboards Nobody Opens
Alert on symptoms users feel, trace the requests that matter, and log for the question you will ask at 2am — not for completeness.
8 min read
Test Suites People Actually Trust
A flaky suite is worse than no suite, because it teaches the team to ignore red. How to build coverage that earns confidence and keeps it.
8 min read
Caching Decisions That Survive Real Traffic
What to cache, where to put it, and how to invalidate without serving stale data — plus the stampede that takes systems down at exactly the wrong moment.
8 min read
Technical Debt Is a Budget, Not a Sin
Some debt is a rational trade and some is compounding interest. How to tell them apart, and how to argue for repayment in terms a business will fund.
8 min read
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