Why My LLM Feature Cost More Than It Should: Field Notes on Prompt Caching, Cache Breakpoints, and the Timestamp That Killed Every Hit ae7c4d
Ahmed Mahmoud
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56 posts published so far
Why My TypeScript Typecheck Got Slow: Field Notes on tsgo, Project References, and isolatedDeclarations af131d
Ahmed Mahmoud
How I Test an LLM Feature: Field Notes on Golden Sets, LLM-as-Judge, and Eval Gates in CI f9c9ac
Ahmed Mahmoud
Migrating Off the Vercel Edge Runtime: Field Notes 81edcb
Ahmed Mahmoud
Why My Next.js Client Bundle Was Bigger Than I Thought: Barrel Files, optimizePackageImports, and the 'use client' Boundary db866f
Ahmed Mahmoud
Why My Next.js Client Bundle Was Bigger Than I Thought: Barrel Files, optimizePackageImports, and the 'use client' Boundary 733678
Ahmed Mahmoud
Focus Management in the Next.js App Router: Field Notes on the Route Change That Loses Focus, inert, and Native dialog a51ee9
Ahmed Mahmoud
Zero-Downtime Postgres Migrations: Field Notes on Expand/Contract, lock_timeout, and the ALTER TABLE That Queued Behind One Slow Query e25ae7
Ahmed Mahmoud
npm Supply-Chain Hardening in 2026: Lifecycle Scripts, minimumReleaseAge, and the Postinstall I Stopped Trusting 7f75f9
Ahmed Mahmoud
Hybrid Search in Postgres with pgvector: Field Notes on HNSW, tsvector, and Why Pure Vector Search Missed Exact Matches 8ff978
Ahmed Mahmoud
Web Workers in the Next.js App Router: Field Notes on import.meta.url, DataCloneError, and What a Worker Cannot Fix 67fdb8
Ahmed Mahmoud
Turborepo in a Real Monorepo: Field Notes on Cache Misses, NEXT_PUBLIC Poisoning, and the tasks Key That Replaced pipeline 1835a9
Ahmed Mahmoud
Temporal in Production: Field Notes on Replacing JavaScript Date, the Same-Day Bug, and What Doesn't Cross the RSC Boundary 6fa0e4
Ahmed Mahmoud
Parallel Routes and Intercepting Routes in the Next.js App Router: Field Notes on the Photo-Modal Pattern bc3e3f
Ahmed Mahmoud
Observability in the Next.js App Router: Field Notes on instrumentation.ts, onRequestError, and the Trace That Leaked Across Requests d7bf86
Ahmed Mahmoud
Multi-Tenant SaaS in the Next.js App Router: Field Notes on Subdomain Middleware, Tenant-Scoped Caching, and the Leak I Almost Shipped bbe064
Ahmed Mahmoud
Database Connections in Serverless: Field Notes on Pool Math, PgBouncer Transaction Mode, and the Singleton HMR Kept Recreating e15ab7
Ahmed Mahmoud
Environment Variables in Next.js: Field Notes on NEXT_PUBLIC_ Inlining, the Secret That Almost Shipped, and Failing the Build with Zod 684beb
Ahmed Mahmoud
Webhooks in the Next.js App Router: Field Notes on Raw Bodies, Signature Verification, and Returning 200 Before the Work 34d074
Ahmed Mahmoud
next/image in Next.js 16: Field Notes on LCP, the sizes Prop That Doubles Bandwidth, and What Optimization Costs 2ca6f6
Ahmed Mahmoud
Rate Limiting in the Next.js App Router: Field Notes on Middleware, Redis, and the Server Action That Looks Like Every Other POST 981432
Ahmed Mahmoud
Testing the Next.js App Router: Field Notes on Server Components, Mocking fetch(), and Where Playwright Takes Over c62c76
Ahmed Mahmoud
File Uploads in the Next.js App Router: Field Notes on Vercel Blob, Client Uploads, and the Callback That Never Fires on localhost 0da6df
Ahmed Mahmoud
Web Push in the Next.js App Router: Field Notes on Service Workers, VAPID, and the iOS Rule That Silently Blocks Everything ba51d8
Ahmed Mahmoud
Content Security Policy in the Next.js App Router: Field Notes on Nonces, strict-dynamic, and the Middleware That Made Every Page Dynamic 50ccd5
Ahmed Mahmoud