Ahmed Mahmoud - DEV Community

Ahmed Mahmoud

Oct 20

Why My Deploy Broke Every Open Tab: Field Notes on ChunkLoadError, Deployment Skew, and Versioned Clients

#nextjs #webdev #react #devops

7 min read

Ahmed Mahmoud

Oct 19

Why My Playwright Tests Passed Locally and Failed in CI: Field Notes on Auto-Waiting, Test Isolation, and Trace-Driven Debugging

#playwright #testing #nextjs #webdev

6 min read

Ahmed Mahmoud

Oct 17

Why My Node Process Kept Growing: Field Notes on Heap Snapshots, Module-Scope Caches, and Leaks That Only Appear When Instances Are Reused

#node #javascript #performance #debugging

7 min read

Ahmed Mahmoud

Oct 16

Why My CDN Cache Never Hit: Field Notes on Cache-Control, s-maxage, and stale-while-revalidate

#webdev #nextjs #performance #caching

2

1

6 min read

Ahmed Mahmoud

Oct 15

Why My Fonts Caused Layout Shift: Field Notes on next/font, size-adjust, and Arabic Fallback Metrics

#nextjs #performance #webdev #css

1

8 min read

Ahmed Mahmoud

Oct 12

Why My Package Broke in a CommonJS App: Field Notes on require(esm), the exports Map, and the Dual Package Hazard

#node #typescript #javascript #webdev

7 min read

Ahmed Mahmoud

Oct 7

Why My LLM Feature Cost More Than It Should: Field Notes on Prompt Caching, Cache Breakpoints, and the Timestamp That Killed Every Hit

#ai #llm #typescript #webdev

1

7 min read

Ahmed Mahmoud

Oct 6

Why My TypeScript Typecheck Got Slow: Field Notes on tsgo, Project References, and isolatedDeclarations

#typescript #webdev #programming #performance

8 min read

Ahmed Mahmoud

Oct 4

How I Test an LLM Feature: Field Notes on Golden Sets, LLM-as-Judge, and Eval Gates in CI

#ai #testing #typescript #webdev

8 min read

Ahmed Mahmoud

Sep 25

Why My Next.js Client Bundle Was Bigger Than I Thought: Barrel Files, optimizePackageImports, and the 'use client' Boundary

#nextjs #react #performance #webdev

7 min read

Ahmed Mahmoud

Sep 24

Focus Management in the Next.js App Router: Field Notes on the Route Change That Loses Focus, inert, and Native dialog

#nextjs #react #a11y #webdev

3

1

8 min read

Ahmed Mahmoud

Sep 21

Zero-Downtime Postgres Migrations: Field Notes on Expand/Contract, lock_timeout, and the ALTER TABLE That Queued Behind One Slow Query

#postgres #database #devops #node

8 min read

Ahmed Mahmoud

Sep 14

npm Supply-Chain Hardening in 2026: Lifecycle Scripts, minimumReleaseAge, and the Postinstall I Stopped Trusting

#npm #security #node #webdev

2

7 min read

Ahmed Mahmoud

Sep 6

Hybrid Search in Postgres with pgvector: Field Notes on HNSW, tsvector, and Why Pure Vector Search Missed Exact Matches

#postgres #ai #database #webdev

1

7 min read

Ahmed Mahmoud

Sep 5

Web Workers in the Next.js App Router: Field Notes on import.meta.url, DataCloneError, and What a Worker Cannot Fix

#nextjs #javascript #performance #webdev

1

9 min read

Ahmed Mahmoud

Sep 3

Turborepo in a Real Monorepo: Field Notes on Cache Misses, NEXT_PUBLIC Poisoning, and the tasks Key That Replaced pipeline

#turborepo #monorepo #nextjs #devops

1

8 min read

Ahmed Mahmoud

Sep 2

Temporal in Production: Field Notes on Replacing JavaScript Date, the Same-Day Bug, and What Doesn't Cross the RSC Boundary

#javascript #typescript #webdev #react

1

7 min read

Ahmed Mahmoud

Sep 1

Parallel Routes and Intercepting Routes in the Next.js App Router: Field Notes on the Photo-Modal Pattern

#nextjs #react #webdev #frontend

2

6 min read

Ahmed Mahmoud

Aug 31

Observability in the Next.js App Router: Field Notes on instrumentation.ts, onRequestError, and the Trace That Leaked Across Requests

#nextjs #opentelemetry #observability #webdev

1

6 min read

Ahmed Mahmoud

Aug 28

Database Connections in Serverless: Field Notes on Pool Math, PgBouncer Transaction Mode, and the Singleton HMR Kept Recreating

#postgres #serverless #node #webdev

1

5 min read

Ahmed Mahmoud

Aug 25

Environment Variables in Next.js: Field Notes on NEXT_PUBLIC_ Inlining, the Secret That Almost Shipped, and Failing the Build with Zod

#nextjs #typescript #security #webdev

2

1

6 min read

Ahmed Mahmoud

Aug 24

Webhooks in the Next.js App Router: Field Notes on Raw Bodies, Signature Verification, and Returning 200 Before the Work

#nextjs #webhooks #webdev #javascript

1

6 min read

Ahmed Mahmoud

Aug 22

next/image in Next.js 16: Field Notes on LCP, the sizes Prop That Doubles Bandwidth, and What Optimization Costs

#nextjs #performance #webdev #react

1

7 min read

Ahmed Mahmoud

Aug 19

Rate Limiting in the Next.js App Router: Field Notes on Middleware, Redis, and the Server Action That Looks Like Every Other POST

#nextjs #webdev #security #redis

1

9 min read

Ahmed Mahmoud

Aug 18

File Uploads in the Next.js App Router: Field Notes on Vercel Blob, Client Uploads, and the Callback That Never Fires on localhost

#nextjs #typescript #webdev #vercel

2

8 min read

Ahmed Mahmoud

Aug 17

Web Push in the Next.js App Router: Field Notes on Service Workers, VAPID, and the iOS Rule That Silently Blocks Everything

#nextjs #webdev #javascript #pwa

7 min read

Ahmed Mahmoud

Aug 14

Content Security Policy in the Next.js App Router: Field Notes on Nonces, strict-dynamic, and the Middleware That Made Every Page Dynamic

#nextjs #security #webdev #react

8 min read

Ahmed Mahmoud

Aug 13

Passkeys in Production: Field Notes on WebAuthn, Conditional UI, and the RP ID That Broke My Login

#webdev #security #nextjs #javascript

8 min read

Ahmed Mahmoud

Aug 11

Modern CSS Deleted My Layout JavaScript: Field Notes on Container Queries, :has(), and Subgrid

#css #webdev #frontend #html

7 min read

Ahmed Mahmoud

Aug 10

Background Jobs on Vercel in 2026: Field Notes on waitUntil, Queues, Workflow, and Cron

#vercel #node #serverless #webdev

7 min read

Ahmed Mahmoud

Aug 9

Running AI-Generated Code Safely: Field Notes on Vercel Sandbox

#vercel #ai #node #security

5 min read

Ahmed Mahmoud

Aug 8

Node.js Has a Test Runner Now: Field Notes on Dropping Jest for Scripts and Libraries

#node #testing #javascript #webdev

4 min read

Ahmed Mahmoud

Aug 7

Getting Typed JSON Out of LLMs: Field Notes on generateObject

#ai #typescript #javascript #webdev

5 min read

Ahmed Mahmoud

Aug 2

Node.js Runs TypeScript Now: Field Notes on Native Type Stripping

#node #typescript #javascript #webdev

5 min read

Ahmed Mahmoud

Aug 1

AbortController Beyond fetch: The Cancellation Patterns I Use in Every React App

#javascript #react #webdev #frontend

5 min read

Ahmed Mahmoud

Jul 31

One API Key for Every Model: Field Notes on the Vercel AI Gateway

#ai #vercel #typescript #webdev

4 min read

Ahmed Mahmoud

Jul 27

WebSockets on Vercel Functions: Real-Time Without a Separate Server

#nextjs #websockets #vercel #webdev

5 min read

Ahmed Mahmoud

Jul 26

Next.js Middleware in 2026: Auth Guards, A/B Tests, and What Belongs at the Edge

#nextjs #typescript #webdev #performance

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1

4 min read

Ahmed Mahmoud

Jul 25

Shipping a Bilingual Next.js App in English and Arabic: Routing, RTL, and What Crawlers Actually See

#nextjs #i18n #webdev #seo

1

6 min read

Ahmed Mahmoud

Jul 23

Streaming AI Responses in Next.js: SSE, Fetch Streams, and What Breaks in Production

#nextjs #ai #webdev #javascript

1

6 min read

Ahmed Mahmoud

Jul 22

What Changed in Zod 4, and How I Migrated Production Schemas

#typescript #zod #webdev #node

1

4 min read

Ahmed Mahmoud

Jul 21

Route Handlers vs Server Actions in Next.js: When I Reach for Each

#nextjs #react #webdev #typescript

1

4 min read

Ahmed Mahmoud

Jul 20

URL State in the Next.js App Router: How I Stopped Losing UI State on Refresh

#nextjs #react #typescript #webdev

1

5 min read

Ahmed Mahmoud

Jul 19

Error Handling in the Next.js App Router: How I Stopped One Throw From Blanking the Page

#nextjs #react #webdev #typescript

1

5 min read

Ahmed Mahmoud

Jul 18

View Transitions in Next.js: How I Added Animated Page Changes Without a Library

#nextjs #react #css #webdev

1

5 min read

Ahmed Mahmoud

Jul 16

Debugging Hydration Mismatches in the Next.js App Router

#nextjs #react #webdev #javascript

1

5 min read

Ahmed Mahmoud

Jul 16

Fixing INP: Field Notes on Interaction to Next Paint in a React App

#react #performance #webdev #javascript

2

4 min read

Ahmed Mahmoud

Jul 13

Next.js Server Actions Are Public Endpoints: How I Lock Them Down

#nextjs #security #react #webdev

1

3 min read

Ahmed Mahmoud

Jul 12

React Compiler in 2026: What It Actually Memoizes (And What It Doesn't)

#react #nextjs #performance #webdev

3 min read

Ahmed Mahmoud

Jul 12

Partial Prerendering in Next.js: The Static Shell + Dynamic Stream Model

#nextjs #react #webdev #performance

3 min read

Ahmed Mahmoud

Jul 12

I Replaced ESLint and Prettier with Biome on Two Production Repos

#biome #javascript #typescript #webdev

4 min read

Ahmed Mahmoud

Jul 12

TanStack Query in 2026: What Server Components Didn't Replace

#react #nextjs #typescript #webdev

3 min read

Ahmed Mahmoud

Jul 12

useOptimistic in React 19: Patterns and Pitfalls from Real Forms

#react #webdev #javascript #frontend

1

2 min read

Ahmed Mahmoud

Jul 11

Tailwind CSS v4: What Actually Changed and How I Migrated Two Projects

#tailwindcss #css #webdev #frontend

2 min read

Ahmed Mahmoud

Jul 6

Upgrading to Next.js 16: Field Notes from Two Production Apps

#react #nextjs #webdev #frontend

4 min read

Ahmed Mahmoud

Jun 30

Next.js 15.5 Cache Components: The RSC Caching Story Finally Clicks

#nextjs #react #performance #webdev

3 min read

Ahmed Mahmoud

Jun 30

Shipping with the Claude Agent SDK: 6 Patterns That Survived Production

#ai #typescript #agents #webdev

3 min read

Ahmed Mahmoud

Jun 30

GEO in 2026: How to Get Cited by ChatGPT, Perplexity & Claude

#ai #seo #webdev #marketing

1

4 min read

Ahmed Mahmoud

Jun 28

Building AI-Native Frontends with Claude Code and MCP

#ai #productivity #webdev #react

2

2 min read

Ahmed Mahmoud

Jun 28

Signals vs React Compiler: The Fine-Grained Reactivity Showdown

#react #javascript #webdev #performance

2 min read

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