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WebSockets Sound Simple Until You Have to Maintain One There's a moment every engineer...


Build vs. buy for in-app, email and push, argued through per-tenant branding and real-time delivery.


Almost every senior Node question is the same question wearing a different hat: do you understand...


A YouTube upload stage wrote its local "already uploaded" record only after verification succeeded, ...


A request that never came back has three possible histories and one symptom. Why "unknown" has to be...


Picking up between "join" and "start fresh" Part 1 left you with two propagation modes and...


SellerVai merges rapid-fire customer messages into one reply using an in-memory buffer that explicit...


One million HTTP requests every second sounds like a server-sizing problem: add more CPU, launch mor...


How partial indexes change query plan selection, write amplification, and working-set pressure in Mo...


Stop dumping raw message arrays into LLMs and start using structured state with sliding windows. ...


Startups building B2B products reach for multi-tenancy in PostgreSQL the same way on day one: one...


Modern systems run on data in the form of fast, real-time, continuous streams. But what happens whe...


Learn React. Learn a backend language. Build projects. Apply to jobs. That's the advice every...


How Redis pipelining degrades under write amplification, why HOL blocking compounds latency, and how...


One-click upsell is the page that appears right after someone buys: "add this for $29, no need to...


System Design from Developer to Architect — Part 2 In Part 1, we took a backend from: User →...


If your API feels fast in development but becomes painfully slow in production as your data grows,.....


Concurrent workers refreshing a rotating OAuth refresh token cause invalid_grant and disconnected in...


The first authorization bug I ever shipped wasn't a missing [Authorize] attribute. It was the...


When learning Angular, Spring, and Node.js, I often came across terms like SOLID, Dependency...


We've all been there: you download a shinny new finance app, spend 20 minutes setting up your...


This article was written by Lin Borland Aggregation pipelines are one of the most powerful tools in...


When building backend systems, choosing the right communication protocol can have a significant...


Imagine you have built a backend API that works perfectly. You deploy it to a server, connect your....