Mohamed Elsayed
Backend Engineer | Scalable APIs & Microservices.
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We had around 200 permissions stored in every user's Redis session.
The permissions were stored as plain-text strings, which meant every session was carrying more data than necessary.
We considered three approaches:
Numeric IDs: [0, 3, 22]
A bitmask: one bit per permission
A...
Dates, timezones, UTC, and ISO 8601.
Every timestamp we send and accept:
2026-08-07T22:15:30.123+03:00
2026-08-07 → the date, YYYY-MM-DD. Year, month, day. Largest unit first, so sorting these strings alphabetically sorts them by time.
T → separator between date and time.
22:15:30 →...
Recently bought a domain through Cloudflare and noticed the price was almost half of what I would have paid through AWS Route 53.
One thing interesting about AI saved me alot of development time is API documentation, I used to do it by hand, slow and boring, a ton of mouse clicks.
Source code
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│ inspect controllers / DTOs
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Custom JSON
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│ injector
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Insomnia local database
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Insomnia collection