Gradient Descent Explained: SGD, Adam, and When to Use Each
6 min read Gradient descent is the engine behind nearly every machine learning model trained today. If you are interviewing for an ML […] Read article
AI/ML Interview Questions
System Design
Caching Strategies: Cache-Aside, Write-Through, and Beyond
7 min read Caching is the single highest-leverage optimization in most system designs. Before you reach for database sharding or complex infrastructure, a Read article
System Design
Message Queues: Kafka, RabbitMQ, and Async Architecture
6 min read Message queues decouple the components of a distributed system so that producers and consumers can operate independently. They appear in Read article
System Design
Load Balancing: Algorithms, Layers, and Failure Handling
6 min read A load balancer sits in front of a pool of servers and distributes incoming requests across them. It is one Read article
System Design
CAP Theorem: Consistency, Availability, and Partition Tolerance
5 min read The CAP theorem comes up in almost every senior-level system design interview. Interviewers ask it because it forces you to Read article
System Design
Database Sharding: Horizontal Partitioning at Scale
5 min read Database sharding is a core scaling technique you’ll need to explain in nearly any large-scale system design interview. The question Read article
System Design
Consistent Hashing: How Distributed Systems Route Traffic
5 min read Consistent hashing is one of the most commonly asked system design concepts at big tech companies. You will almost certainly Read article
Company Guides
DoorDash Interview Guide
11 min read DoorDash Interview Guide 2026: Last-Mile Logistics, Marketplace Engineering, and Delivery Infrastructure DoorDash is the #1 food delivery platform in the Read article
Company Guides
Robinhood Interview Guide
7 min read Robinhood Interview Guide 2026: Trading Infrastructure, Financial Systems, and Fintech Engineering Robinhood democratized retail investing and options trading. Their engineering Read article
Company Guides
Snap Interview Guide
18 min read Snap Interview Guide 2026: AR Engineering, Camera Systems, and Real-Time Communication at Scale Snap Inc. is a camera company — Read article
Company Guides
Shopify Interview Guide
23 min read Shopify Interview Guide 2026: E-Commerce Infrastructure, Ruby/Rails Engineering, and Multi-Tenant Scale Shopify powers 10%+ of US e-commerce with 1.7M+ merchants. Read article
Company Guides
Twitch Interview Guide
5 min read Twitch Interview Guide 2026: Live Streaming Infrastructure, Real-Time Chat, and Creator Platform Engineering Twitch (Amazon subsidiary) is the world’s leading Read article
Company Guides
Atlassian Interview Guide
29 min read Atlassian Interview Guide Company Overview: Atlassian is known for collaboration software including Jira, Confluence, Trello, and Bitbucket. The company emphasizes Read article
Company Guides
Coinbase Interview Guide
18 min read Coinbase Interview Guide Company Overview: Coinbase is a leading cryptocurrency exchange platform. As a publicly-traded company (NASDAQ: COIN), it operates Read article
Data Structures
Implement a Rate Limiter: Token Bucket, Leaky Bucket, Sliding Window
8 min read Implement a Rate Limiter: Token Bucket, Leaky Bucket, Sliding Window Rate limiting is one of the most-asked system-design topics in Read article