Backend engineer in Amsterdam and Mongoose core maintainer building Node.js, TypeScript, MongoDB, and Cloudflare systems.https://a-hafez.com/https://a-hafez.com/blog/self-hosting-shottr-screenshots-on-cloudflare/https://a-hafez.com/blog/self-hosting-shottr-screenshots-on-cloudflare/How I replaced Shottr's cloud uploads with a Cloudflare Worker and R2 so screenshots live on my own domain behind unguessable URLs. Full build, with every gotcha.Sat, 06 Jun 2026 00:00:00 GMThttps://a-hafez.com/blog/mongoose-bulksave-mongodb-writes/https://a-hafez.com/blog/mongoose-bulksave-mongodb-writes/How Model.bulkSave() leverages MongoDB's bulkWrite to reduce network roundtrips and significantly improve write performance.Thu, 18 Nov 2021 00:00:00 GMThttps://a-hafez.com/blog/software-performance-pragmatic-guide/https://a-hafez.com/blog/software-performance-pragmatic-guide/A practical approach to performance optimization. Focus your energy where it matters: I/O bottlenecks, not micro-optimizations.Fri, 09 Jul 2021 00:00:00 GMThttps://a-hafez.com/blog/optional-chaining-good-addition/https://a-hafez.com/blog/optional-chaining-good-addition/Optional chaining is convenient, but if used carelessly it silences errors that should be caught early. Here's when to use it and when not to.Thu, 24 Oct 2019 00:00:00 GMT