Writing

Notes on building software

Engineering write-ups and case studies by Sameera Madushan on React, Next.js, Node.js, build tooling, production reliability and leading engineering teams.

5 postsRSS feed

October 6, 20268 min read

Loop engineering: AI agents that finish without re-prompting

Loop engineering replaces the human re-prompt with a system: a stop condition, a guardrail the agent cannot negotiate with, and a bounded iteration count.

Claude Code
AI-assisted development
Agents

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Case study

September 20, 20267 min read

AI-assisted development across fifteen repos: the context is the product

A test-writing pilot measured a 93.8% effort reduction. The strongest trial available found developers 19% slower. Both are true, and the difference between them is what you wrote down.

Claude Code
AI-assisted development
Developer experience

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September 19, 202616 min read

Sentry budgeting for Next.js: the spend is in spans, the noise is in errors

An audit of two production Next.js dashboards found 13.5M stored transactions against ~25,000 errors — and 75–90% of those errors were noise. Four policies for monitoring you can trust at a cost you can predict.

Sentry
Observability
Next.js

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Case study

September 19, 20265 min read

Decoupling deploy from release: moving a team off long-lived branches

Four engineers, four repositories, and a branch model where nothing merged until a feature was finished and tested. What changed when we put flags first and made the merge boring.

Trunk-based development
Feature flags
LaunchDarkly

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Case study

September 19, 20265 min read

Webpack to Turbopack: what a production Next.js migration actually changed

Measured before-and-after from moving a production Next.js dashboard to Turbopack: CI builds fell from ~5 minutes to 44 seconds, and HMR did not improve at all.

Next.js
Turbopack
Webpack

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