Level Up Your FAANG Interview: A 3‑Month Training Montage Inspired by Rocky
The Quest Begins (The “Why”) I still remember the first time I opened LeetCode and felt like I’d stepped into the Upside Down from Stranger Things —…
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Decoding recruiter silence
Applying for jobs often means navigating a void of information. The application goes out, and then... silence. This quiet can be frustrating, leadin…
Negotiating Your Salary Like a Jedi: One Technique That Works
The Quest Begins (The "Why") I still remember the first time I got a job offer after months of interviewing. The recruiter threw out a number that f…
Stop scripting interview answers. Build a panel.
Most interview prep fails for the same reason: it happens in your head. You read sample answers, you nod, you feel ready — and then someone asks "te…
REST API Interview Questions (With Model Answers)
These are the REST API questions that actually come up in backend and full-stack interviews — grouped by topic, each with a short model answer and a…
Split-Brain Needs a Cluster. Mine Happened on One Server.
Today I want to talk about split-brain. The name sounds dramatic, and the problem is dramatic too. One system splits into two halves, and each half…
The STAR Method: Your Interview Lightsaber
The Quest Begins (The "Why") I still remember my first round of behavioural interviews like it was yesterday. I walked in, polished resume in hand,…
A Complete Guide to A/B Testing for Data Analysts
A/B testing sounds simple: show half your users version A, the other half version B, and pick the winner. In practice, it’s one of the easiest place…
Nobody Warns You the Data Engineering Interview Isn't About Data Engineering
I've sat on both sides of the interview table more times than I can count. Here's the thing nobody tells you going in: the interview almost never te…
Design YouTube — Video Upload, Transcoding & CDN Delivery at Scale (with Production .NET Code)
"Design YouTube" is where two systems live in one product, pulling in opposite directions. The write side is a brutal batch-processing problem: some…
The Hard Truth About Data Engineering Interviews Nobody Tells You
It's 11 PM. You've solved forty LeetCode mediums this month. Your GitHub has a shiny new Airflow project with green checkmarks all the way down. Tom…
JavaScript and TypeScript Interview Questions Explained With Real Production Examples
Most explanations of these concepts stop at the definition. Scope gets a rule about hoisting. Closures get a counter function that increments a numb…
Building My Own Technical Interview Practice Repository
Preparing for technical interviews has made me realize something: solving more exercises doesn't necessarily mean practicing better. I've spent quit…
The Code Review Interview: I Hand Candidates a Broken PR
The candidate had thirty minutes and a 180-line pull request. Sixty seconds in, they said: "Line 43, this variable should be camelCase." I wrote it…
I kept failing interviews on delivery, so I built a practice coach that scores eye contact
The answers were usually fine. The first 90 seconds were not. I would leave a call knowing what I meant to say, and also knowing I had looked at the…
Nine categories: how engineering manager interviews actually get scored
Most EM interview prep fails the same way. You pick three strong stories, polish them until they're tight, run them past a friend, and walk in confi…
A Mind Map for Mobile System Design Preparation
Mobile system design interviews can feel overwhelming. You're asked to design something that sounds simple — a news feed, chat application, ride-sha…
Why Strong Engineers Fail Coding Interviews: A Scorecard Autopsy
The strongest candidate I ever voted no on solved the problem in eleven minutes. Clean. Optimal. Caught the edge case I normally have to hint at twi…
Node.js interview deep dive: what they are really testing
Almost every senior Node question is the same question wearing a different hat: do you understand that there is one thread doing your work, and do y…
A SQL interview is a translation test, not a syntax test
Canonical: this is a cross-post. The original lives at https://four-leaf.ai/blog/sql-interview-guide Key takeaways A SQL interview is a translation…
How I Cracked LeetCode Like a Jedi: The Ultimate Beginner's Study Plan
The Quest Begins (The "Why") I still remember staring at my screen, heart pounding, as the timer ticked down on a mock interview. The problem was Tw…
May the STAR Be With You: Mastering Behavioural Interviews
The Quest Begins (The "Why") I still remember my first behavioural interview like it was yesterday. I walked in, shook hands, and the interviewer hi…
The Interview Question That Quietly Sinks Excellent European Engineers
You didn't fail the coding round. You failed a sentence. Here's a scenario I hear constantly from senior engineers in Prague, Berlin, Warsaw, and Li…
How Will You Configure Multiple Backend Instances in Apigee X So That If One Goes Down, Traffic Is Routed to Another?
“You have multiple backend instances. If one instance goes down, how will Apigee X automatically route traffic to another healthy instance?” This so…
Interviewing off leetcode you already memorized isn't cheating, it's the job
Someone was accused of cheating because they were able to solve a difficult problem very quickly. Not for playing with AI. Not for copying from a sc…
Intuit OA 2026 Guide: Code, SQL & Bash Questions Explained
The Intuit Online Assessment (OA) has started rolling out again, and the format remains very similar to previous years. Most candidates receive thre…
How I Crashed My TCS Prime Interview and Talked My Way Out of Hell Mode
Picture this, sitting in front of a panel of seasoned pros for a TCS Prime interview, your palms sweating, your brain rewinding every tutorial you e…
The Follow-Up Questions That Decide System Design Interviews (And How to Pre-Empt Them)
Where Interviews Are Actually Won Ask interviewers where candidates separate, and almost none will say "the initial design." Prep materials have con…
Explain the Concept of "Convention over Configuration" in Spring Boot
If you've ever started a Java project, you probably know how much configuration is usually required. You need to configure XML files, register beans…
I Hired Claude, But Slower and More Expensive
The comment landed on the pull request early afternoon, around 9 in the morning his time; we worked a few time zones apart. Four paragraphs defendin…