Session Management, Rate Limiting & Caching using Redis
Modern distributed systems — whether fintech APIs, e-commerce platforms, or AI-powered services — share a fundamental challenge: every replica, micros…
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Why We Accidentally Blocked Our Users: A Deep Dive into Idempotency in Distributed Systems
I learned one of my most important distributed-systems lessons the hard way. We were working on a payment flow connected to an external payment gatewa…
How to Handle Telegram Albums in Telegraf
When building Telegram bots with Telegraf, it is easy to expect that a media album arrives as a single message. In reality, Telegram sends every media…
Building a Redis Clone in Go
1. Introduction To better understand how databases and network servers work internally, I built a Redis-inspired in-memory database in Go. This projec…
Why your .NET 8 API needs a cache layer — and how to build it right with Redis/Valkey and tag invalidation
Caching is one of those things that sounds optional until your database starts getting hammered at scale, your response times creep up, and you realis…
Real-Time APIs Are Simpler Than You Think: Redis, Lua, and 4k Updates/sec
1. Intro — The Problem We Actually Had Building real-time systems is often presented as a distributed systems problem. Kafka, stream processors, event…
Scaling WebSocket
WebSocket provides low-latency, bidirectional communication between clients and servers. It is a widely used solution for building real-time systems. …
From Piper to Polly: How I Built a Production-Ready Text-to-Speech API (and Everything That Broke Along the Way)
A walkthrough of building a voice AI backend — through three TTS providers, a chunking problem, Redis caching, distributed locks, and a thundering her…
I Built an Online Multiplayer Ludo Game
So, this year I made a few resolutions — and sure, no one keeps to resolutions, but I decided to at least keep these two: first was no more tutorials,…
Filling a maintainer's "Help needed": shipping a Next.js 16 Redis cache handler
Filling a maintainer's "Help needed": shipping a Next.js 16 Redis cache handler Next.js 16 split caching into two distinct handler interfaces: cacheHa…
A Framework Is Not a Platform
For most of the time we have been writing web applications, two different teams answered two different questions. The framework team decided what the …
Making It Fast: Caching, Hot Paths, and Avoiding DB Calls
The Auth Gateway sits in front of every authenticated request in the platform. Its latency isn't just its own latency — it's the floor for every servi…
Token Revocation Without Killing Performance
JWTs have a hard problem hiding inside them: they're stateless. The whole point of a JWT is that the verifier can check a signature and make a decisio…
5-Minute AI Jobs and Closed Tabs — Why We Built Replay-Then-Tail SSE
We had a feature in production where a single user request could run for five-plus minutes — fetch documents, chunk them, hit an LLM per chunk, synthe…