What an AI Engineer job actually tests
An AI Engineer job posting almost never asks you to train a model. It asks for Python. Backend services. APIs. Deployment. Say you are two years into …
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From Payment to Shipping: How We Built a Cross-Border Order State Machine That Solved Idempotency and Callback Chaos
When your payment gateway fires the same "paid" webhook three times, your logistics API calls back with "shipped" before payment is confirmed, and the…
When to refactor vs rewrite
A decision tree for grown engineers Every engineering team eventually faces the same dramatic sentence. We should just rewrite this. It is usually sai…
I Found the LeetCode for System Design Interview, and It's Awesome
Disclosure: This post includes affiliate links; I may receive compensation if you purchase products or services from the different links provided in t…
How We Split a Legacy Monolith Into Microservices Without a Single Outage
8 min read · telecom provisioning platform, 30M+ subscribers Most companies avoid migrating their monolith for one reason: they imagine it as a single…
Building Reliable Event-Driven Systems: Event Schemas, Versioning, Contract Testing and Events vs Commands (part-4)
In this article, we're going to explore Contract Testing Contract testing ensures that event contracts remain stable as systems evolve. Producers rece…
We fixed a hidden bug in a system processing 10M+ messages a day.
9 min read · warehouse execution system, global retail & manufacturing A few years ago I worked on a warehouse execution system (WES) — the softwa…
Stop Starting with Microservices (Build a Monolith First)
Most startups don't fail because they chose a monolith. They fail because they never built something people actually want. The "Microservices from Day…
Load Balancing: The Neo Way to Dodge Traffic
The Quest Begins (The “Why”) I still remember the night our API started to sputter under a sudden traffic spike. Users were seeing 502 errors, the mon…
Building Reliable Event-Driven Systems: Event Schemas, Versioning, Contract Testing and Events vs Commands (part-2)
This is part-2 of the article series on "Building Reliable Event-Driven Systems". In this article, we're going to explore Event Schemas . 5. Designing…
Cybersecurity 101 : Windows Notifications
Introduction So imagine you are focused on your cappuccino-frappuccino doing something very important on you win laptop and then have a cringe attack …
Why Early MVPs Fail Before Launch
Most MVPs do not fail because the first version is too small. They fail because the first version is not focused enough. A real MVP is not just a redu…
# The Complete TypeScript Mastery Guide
Learn TypeScript From First Principles to Senior/Staff-Level Production Engineering If you searched for how to learn TypeScript properly — not just th…
The Difference Between Retry and Idempotency They're Not the Same
Let me start with the confusion that prompted this post: in a recent mentoring session, a senior engineer described their payment service as "idempote…
Decision Provenance in Distributed Financial Systems: Why Systems Must Explain Their Own Decisions
Abstract Distributed financial systems do not merely process transactions. They make decisions. A transaction is approved, rejected, delayed, escalate…
Started a Visual System Design & AI Infrastructure Channel
Hey everyone, I recently started a YouTube channel called The Hot Path , where I explain system design, distributed systems, and AI infrastructure con…
Governance
Governance is not a set of rules layered on top of AI. It is the structural logic that determines how meaning, constraint, and legitimacy are maintain…
The Shop on the Corner: How I Learned System Design Without Building Clone
The Shop on the Corner: How I Learned System Design Without Building Amazon Nephew asks his uncle — 10 years deep into building large-scale systems — …
Average latency is lying to you: Little's Law in production
Your p50 latency is 40 ms. The dashboard is green. And yet users are complaining that the app "feels slow" during peak hours. If you've been on call l…
GraphQL Query & Mutation Architecture, A Production Deep Dive
Author: Erwin Wilson Ceniza Published: July 2, 2026 Tags: GraphQL | HotChocolate | BatchDataLoader | CQRS | Outbox Pattern | Apollo Federation | .NET …
Architecture Models as First-Class Context for AI-Assisted Software Development
Architecture Models as First-Class Context for AI-Assisted Software Development As software engineers, we’ve spent the last few decades treating archi…
Why Your Background Jobs Fail in Production
Most developers first meet background jobs through a deceptively simple model: put work in a queue, let a worker pick it up, and assume the job will b…
Agent-Ready Commerce, Part 6: Checkout Is a State Machine, Not a Form
Checkout is the point where agent-ready commerce stops being mostly read-only. Discovery can be a projection. Comparison can be a query. Policy quotat…
System Design for Working Engineers, Not Interview Prep
Originally published at malaymehta.com The Interview Trap If you look at most system design tutorials, you get an extreme use case. Design Twitter. De…
How to Design an Event-Driven Analytics Pipeline — A System Design Deep Dive
Interview prep series: real problems, real trade-offs, no hand-waving. The Problem Worth Solving Here's a scenario straight from a fintech startup I w…
Building a Real Estate Feasibility Engine: Lessons From Turning Financial Models Into Software
Software engineers have a habit of looking at business problems differently. Where others see reports, developers see data structures. Where others se…
Why AI Apps Need a Multi-Model Access Layer
Most AI applications start simple. A developer chooses one model provider, gets an API key, connects an SDK, writes a few prompts, and ships the first…
Good Architecture Includes Observability
Good architecture is not only about how a system is built. It is also about how well the team can understand that system once it is running. That is w…
Junkyard Computing: The Engineering Case for Building Server Clusters from Dead Smartphones
TL;DR A cluster of discarded smartphones can match the cost and performance profile of cloud server instances for a defined, bounded class of workload…
I built a free system design whiteboard for engineering interviews
I bombed a system design interview last year — not because I didn't know the architecture, but because I spent the first 5 minutes fighting Excalidraw…