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Anish Ansari58m ago · 6 min read

System Design Drill Day 15: Real-Time Chat and Live Order Tracking

A buyer sends a merchant a message from a phone on a patchy mobile connection and then walks into a lift. The merchant is connected to a different WebSocket server from the buyer. The message still ha

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Anish Ansari1d ago · 6 min read

System Design Drill Day 14: URL Shortener and Unique ID Generation

SMS is billed per 160-character segment, and a long tracking URL can push a single message into two. Over a whole marketing blast that adds up to real money, and that alone is reason enough for a mark

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Anish Ansari4d ago · 7 min read

System Design Drill Day 13: Designing a Multi-Channel Notification System

Marketing starts a big campaign, and a few minutes later support starts hearing "I'm not receiving my OTP". The OTPs were queued fine. They're sitting in the same queue as the campaign, behind the who

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DevInterviewMaster4d ago · 8 min read

Database Sharding in System Design Interviews: Choosing a Shard Key, Avoiding Hotspots, and the Follow-ups Interviewers Ask

Somewhere around minute twenty of a system design interview, the numbers get big. "We have 500 million users and 2 billion new rows a day." The candidate says "we'll shard the database," draws three c

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DevInterviewMaster5d ago · 12 min read

Message Queues in System Design Interviews: Kafka vs RabbitMQ vs SQS, Delivery Guarantees, and the Follow-ups Interviewers Ask

At some point in most system design interviews, a box labelled "Queue" shows up between two services. The candidate says "we'll make this async with Kafka," the interviewer nods, and then asks the que

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DevInterviewMaster6d ago · 9 min read

Caching in System Design Interviews: Cache-Aside vs Write-Through vs Write-Back, and the Invalidation Questions Interviewers Ask

Somewhere in almost every system design interview, a candidate says "and we'll put Redis in front of the database." The interviewer nods, writes it down, and then asks the question that actually matte

2 devinterviewmasterhq.hashnode.dev

Anish Ansari6d ago · 7 min read

System Design Drill Day 12: The Saga Pattern for a Multi-Step Checkout

The customer's card was charged, and then the database write for the order failed. You now hold their money with no order to show for it, and the next move (retry the order write or refund the charge)

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DevInterviewMasterOct 31 · 10 min read

Designing a Rate Limiter for SDE-2 Interviews: Token Bucket vs Sliding Window, With the Trade-offs Spelled Out

"Design a rate limiter" is one of the most common system design questions in SDE-2 loops, and it's easy to underestimate. Almost everyone can say "use a token bucket". Fewer people can explain why the

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Anish AnsariOct 30 · 7 min read

System Design Drill Day 11: The Transactional Outbox Pattern

Almost every Laravel checkout controller has the same two lines: save the order, then dispatch a job. It works nearly every time. If Redis hiccups between those two lines, the order is paid and the em

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DevInterviewMasterOct 29 · 8 min read

How to Estimate in a System Design Interview: Back-of-the-Envelope Math That Actually Helps

Almost every system design interview has a moment where the interviewer says, "Okay, how much traffic are we talking about?" Many candidates then do one of two things. They skip estimation entirely an

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Trending tags this week

System Design Drill Day 15: Real-Time Chat and Live Order Tracking

System Design Drill Day 14: URL Shortener and Unique ID Generation

System Design Drill Day 13: Designing a Multi-Channel Notification System

Database Sharding in System Design Interviews: Choosing a Shard Key, Avoiding Hotspots, and the Follow-ups Interviewers Ask

Message Queues in System Design Interviews: Kafka vs RabbitMQ vs SQS, Delivery Guarantees, and the Follow-ups Interviewers Ask

Caching in System Design Interviews: Cache-Aside vs Write-Through vs Write-Back, and the Invalidation Questions Interviewers Ask

System Design Drill Day 12: The Saga Pattern for a Multi-Step Checkout

Designing a Rate Limiter for SDE-2 Interviews: Token Bucket vs Sliding Window, With the Trade-offs Spelled Out

System Design Drill Day 11: The Transactional Outbox Pattern

How to Estimate in a System Design Interview: Back-of-the-Envelope Math That Actually Helps