NestJS Best Practices for 2026: A Practical Guide (Updated for NestJS 12)
NestJS 12 changed a lot of defaults. Here are the practices I'd apply to every new project today: feature modules, validation, config, error...
Oct 8, 2026
19 min
I built my own Redis clone in Python to understand how it works
I used Redis for years without knowing what happens after I type SET. So I built a small clone in Python: it speaks the Redis wire protocol,...
Oct 6, 2026
10 min
Building Production Subscriptions with Razorpay: Webhooks, Signatures, and Edge Cases
Integrating Razorpay into a modern TypeScript backend is full of undocumented landmines: flipped HMAC arguments between orders and subscript...
Oct 5, 2026
8 min
Stop Logging Out Innocent Users: Building Production Refresh Token Rotation with Token Family Revocation in Redis
Naive refresh token rotation causes race conditions that randomly log out legitimate users across multiple tabs. Learn how to architect atom...
Oct 2, 2026
12 min
How to Choose a Database in 2026: Eight Options Compared by Use Case
No database is best at everything. This guide compares eight popular ones by use case, license, current versions and trade-offs, so you can ...
Oct 1, 2026
11 min
How Netflix and Uber Build Event Driven Systems at Scale
A practical look at how Netflix and Uber run event-driven systems at huge scale: isolating failures, choosing delivery guarantees, and plann...
Sep 21, 2026
11 min
Python asyncio from Scratch
Most asyncio tutorials start with syntax. This one starts with the problem. Once you see why your program spends most of its time waiting, c...
Sep 28, 2026
4 min
The Hidden Cost of “Just Add a Setting”
“Can we just add a setting for this?” It sounds harmless. Suppose an office should be able to choose its default appointment duration. The f...
Sep 9, 2026
15 min
Stop Creating an Endpoint for Every Button
There is a pattern that feels completely natural when building an API. The frontend gets an Approve button, so the backend gets an endpoint:...
Sep 7, 2026
9 min