@ahmed-mahmoud

Ahmed Mahmoud

@ahmed-mahmoudJoined June 2026

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Ahmed Mahmoud's blogs

Ahmed Mahmoud's Blogengahmed.hashnode.dev65 posts

Why a Better System Prompt Didn't Stop Prompt Injection: Field Notes on the Lethal Trifecta, Scoped Tools, and Untrusted Output ebfa37

Headline: Prompt injection cannot be fixed with a better system prompt, because a large language model reads instructions and data as one stream of tokens and has no reliable boundary between them. Th

1d ago · 12 min readengahmed.hashnode.dev

Why My Retries Made an Outage Worse: Field Notes on Idempotency Keys, Backoff with Jitter, and Circuit Breakers b32ab8

Headline: Naive retries turn a slow dependency into a self-inflicted outage, because every caller retrying on the same schedule multiplies load on a service that is already failing. The combination th

4d ago · 12 min readengahmed.hashnode.dev

Why My Pagination Got Slower Every Page: Field Notes on OFFSET, Keyset Cursors, and Stable Sort Keys 56512c

Headline: OFFSET pagination tells PostgreSQL to read every row it skips and then throw those rows away, so deep pages get steadily slower and can silently skip or duplicate results while the table is

5d ago · 10 min readengahmed.hashnode.dev

Why My Deploy Broke Every Open Tab: Field Notes on ChunkLoadError, Deployment Skew, and Versioned Clients 6676bb

Headline: A ChunkLoadError after a deploy is deployment skew, not a bundler bug: a browser tab still running build A requests a content-hashed chunk or a Server Action ID that only existed in build A,

Oct 23 · 9 min readengahmed.hashnode.dev

Why My Playwright Tests Passed Locally and Failed in CI: Field Notes on Auto-Waiting, Test Isolation, and Trace-Driven Debugging 812598

Headline: Playwright flake is almost never randomness — it is a race between my assertion and the application's state. Web-first assertions, per-worker data isolation, and trace: 'on-first-retry' remo

Oct 19 · 8 min readengahmed.hashnode.dev

Ahmed Mahmoud

About

Available for

Ahmed Mahmoud's blogs

Why a Better System Prompt Didn't Stop Prompt Injection: Field Notes on the Lethal Trifecta, Scoped Tools, and Untrusted Output ebfa37

Why My Retries Made an Outage Worse: Field Notes on Idempotency Keys, Backoff with Jitter, and Circuit Breakers b32ab8

Why My Pagination Got Slower Every Page: Field Notes on OFFSET, Keyset Cursors, and Stable Sort Keys 56512c

Why My Deploy Broke Every Open Tab: Field Notes on ChunkLoadError, Deployment Skew, and Versioned Clients 6676bb

Why My Playwright Tests Passed Locally and Failed in CI: Field Notes on Auto-Waiting, Test Isolation, and Trace-Driven Debugging 812598

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Ahmed Mahmoud

About

Available for

Ahmed Mahmoud's blogs

Why a Better System Prompt Didn't Stop Prompt Injection: Field Notes on the Lethal Trifecta, Scoped Tools, and Untrusted Output ebfa37

Why My Retries Made an Outage Worse: Field Notes on Idempotency Keys, Backoff with Jitter, and Circuit Breakers b32ab8

Why My Pagination Got Slower Every Page: Field Notes on OFFSET, Keyset Cursors, and Stable Sort Keys 56512c

Why My Deploy Broke Every Open Tab: Field Notes on ChunkLoadError, Deployment Skew, and Versioned Clients 6676bb

Why My Playwright Tests Passed Locally and Failed in CI: Field Notes on Auto-Waiting, Test Isolation, and Trace-Driven Debugging 812598