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Changelog

Track all the latest content additions and updates to Hello Interview. We continuously add new system design breakdowns, deep dives, and learning materials.

December 8 - 14, 2025

8 updates

New Content

Low Level Design in a Hurry

Dec 8, 2025 | Content

Low Level Design Interview Delivery Framework

Dec 8, 2025 | Content

Design Principles

Dec 8, 2025 | Content

OOP Concepts

Dec 8, 2025 | Content

Design Patterns

Dec 8, 2025 | Content

Connect Four Low Level Design

Dec 8, 2025 | Content

Amazon Locker Low Level Design

Dec 8, 2025 | Content

Elevator Low Level Design

Dec 8, 2025 | Content

December 1 - 7, 2025

2 updates

New Videos

How to scale reads in your system design interview

Premium

Dec 6, 2025 | System Design

Time Series Databases for System Design Interviews

Dec 1, 2025 | Deep Dive

November 24 - 30, 2025

1 updates

New Content

Time Series Databases for System Design Interviews

Nov 28, 2025 | Deep Dive

November 17 - 23, 2025

2 updates

New Content

OpenAI Coding Interviews 2025: Real Questions from Real Candidates

Nov 22, 2025 | Blog

New Videos

Design a Collaborative Document Editor Like Google Docs

Premium

Nov 18, 2025 | System Design

November 10 - 16, 2025

1 updates

New Videos

Caching for System Design Interviews

Nov 12, 2025 | Deep Dive

October 27 - November 2, 2025

3 updates

New Content

Meta's AI-Enabled Coding Interview: How to Prepare

Oct 29, 2025 | Blog

New Videos

Sharding in System Design Interviews

Nov 2, 2025 | Deep Dive

Updated Content

Core Concepts for System Design Interviews

Oct 29, 2025 | Quick Guide

October 20 - 26, 2025

2 updates

New Content

Sharding in System Design Interviews

Oct 22, 2025 | Deep Dive

Caching for System Design Interviews

Oct 22, 2025 | Deep Dive

October 13 - 19, 2025

2 updates

New Content

How to Handle Bad Interviewers

Oct 15, 2025 | Blog

New Videos

Design YouTube's Top K Videos Feature

Oct 19, 2025 | System Design

October 6 - 12, 2025

2 updates

New Videos

Cassandra Deep Dive for System Design Interviews

Oct 12, 2025 | Deep Dive

Updated Content

Design YouTube's Top K Videos Feature

Oct 8, 2025 | System Design

September 29 - October 5, 2025

1 updates

New Content

What Happens After the Interview?

Oct 1, 2025 | Blog

September 22 - 28, 2025

1 updates

New Videos

Data Modeling for System Design Interviews

Sep 23, 2025 | Deep Dive

September 15 - 21, 2025

1 updates

New Content

Data Modeling for System Design Interviews

Sep 15, 2025 | Deep Dive

September 1 - 7, 2025

7 updates

New Content

Team Match Survival Guide

Sep 3, 2025 | Blog

Amazon Manager Interview Guides & Questions (2025)

Sep 2, 2025 | Content

Google Manager Interview Guides & Questions (2025)

Sep 2, 2025 | Content

OpenAI L5 Interview Guides & Questions (2025)

Sep 2, 2025 | Content

Airbnb G8 Interview Guides & Questions (2025)

Sep 2, 2025 | Content

Airbnb G9 Interview Guides & Questions (2025)

Sep 2, 2025 | Content

Microsoft L63-64 Interview Guides & Questions (2025)

Sep 2, 2025 | Content

August 25 - 31, 2025

1 updates

New Content

Google L4 Interview Guides & Questions (2025)

Aug 29, 2025 | Content

August 18 - 24, 2025

4 updates

New Content

The 7 Must Know Patterns for System Design Interviews

Aug 20, 2025 | Blog

Google L6 Interview Guides & Questions (2025)

Aug 20, 2025 | Content

New Videos

Design a Distributed Rate Limiter

Aug 19, 2025 | System Design

Updated Content

Design a File Storage Service Like Dropbox

Aug 22, 2025 | System Design

August 11 - 17, 2025

1 updates

New Videos

Real-time Updates Pattern for System Design Interviews

Premium

Aug 17, 2025 | System Design

August 4 - 10, 2025

11 updates

New Content

Meta E3 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Meta E4 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Meta E5 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Meta E6 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Meta M1 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Amazon L4 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Amazon L5 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Amazon L6 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Google L5 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

OpenAI L4 Interview Guides & Questions (2025)

Aug 4, 2025 | Content

Updated Content

Data Structures for Big Data in System Design Interviews

Premium

Aug 6, 2025 | Deep Dive

July 28 - August 3, 2025

1 updates

New Content

Design a Distributed Rate Limiter

Jul 31, 2025 | System Design

July 21 - 27, 2025

2 updates

New Content

SQL vs NoSQL: How to Answer This Interview Question in 2025

Jul 22, 2025 | Blog

API Design for System Design Interviews

Jul 21, 2025 | Deep Dive

July 14 - 20, 2025

2 updates

New Content

How to scale reads in your system design interview

Premium

Jul 17, 2025 | System Design

New Videos

Design a Payment System like Stripe

Premium

Jul 14, 2025 | System Design

July 7 - 13, 2025

5 updates

New Content

Dealing with Contention Pattern for System Design Interviews

Premium

Jul 10, 2025 | System Design

Multi-step Processes Pattern for System Design Interviews

Premium

Jul 10, 2025 | System Design

How to scale writes in your system design interview

Premium

Jul 10, 2025 | System Design

When to Use Event Driven Architecture In System Design Interviews

Jul 9, 2025 | Blog

Updated Content

Design a Payment System like Stripe

Premium

Jul 11, 2025 | System Design

June 30 - July 6, 2025

2 updates

New Content

Handling Large Blobs Pattern for System Design Interviews

Premium

Jul 3, 2025 | System Design

Bot Detection ML System Design

Jul 2, 2025 | ML System Design

June 23 - 29, 2025

2 updates

New Content

How to Ramp Up Like a Pro: Your First 90 Days Matter More Than You Think

Jun 26, 2025 | Blog

Managing Long Running Tasks Pattern for System Design Interviews

Premium

Jun 26, 2025 | System Design

June 16 - 22, 2025

2 updates

New Videos

Design a Price Tracking Service like CamelCamelCamel

Premium

Jun 22, 2025 | System Design

Design Facebook's Post Search

Jun 19, 2025 | System Design

June 9 - 15, 2025

1 updates

New Content

"Should I join a start up or Big Tech?"

Jun 12, 2025 | Blog

June 2 - 8, 2025

3 updates

New Content

Design a Price Tracking Service like CamelCamelCamel

Premium

Jun 4, 2025 | System Design

Design a News Aggregator like Google News

Premium

Jun 2, 2025 | System Design

New Videos

Design Facebook's News Feed

Jun 5, 2025 | System Design

May 26 - June 1, 2025

1 updates

New Content

How Behavioral Interviews Really Work

May 29, 2025 | Blog

May 12 - 18, 2025

3 updates

New Content

How I'd Prepare for a System Design Interview if I Were Starting From Scratch

May 15, 2025 | Blog

System Design Trackers from Netflix's Ad Tracking Launch

May 15, 2025 | Blog

Design a Payment System like Stripe

Premium

May 14, 2025 | System Design

April 28 - May 4, 2025

4 updates

New Content

Video Recommendation System Design

May 1, 2025 | ML System Design

Machine Learning System Design in a Hurry

Apr 29, 2025 | ML System Design

ML System Design Evaluation

Apr 29, 2025 | ML System Design

Harmful Content Detection ML System Design

Apr 28, 2025 | ML System Design

April 21 - 27, 2025

1 updates

New Content

System Design Delivery Framework

Apr 24, 2025 | ML System Design

April 7 - 13, 2025

1 updates

New Content

ZooKeeper Deep Dive for System Design Interviews

Premium

Apr 10, 2025 | Deep Dive

March 24 - 30, 2025

2 updates

New Content

Counting Events at Scale: Netflix's Counter Abstraction

Mar 27, 2025 | Blog

Flink Deep Dive for System Design Interviews

Premium

Mar 26, 2025 | Deep Dive

March 3 - 9, 2025

1 updates

New Content

Stop memorizing, start pattern matching

Mar 6, 2025 | Blog

February 24 - March 2, 2025

3 updates

New Content

3 Networking Tricks to Level-Up Your System Design Interview

Feb 27, 2025 | Blog

Networking Essentials for System Design Interviews

Feb 27, 2025 | Deep Dive

Design a Photo Sharing App Like Instagram

Premium

Feb 26, 2025 | System Design

February 17 - 23, 2025

2 updates

New Content

CAP Theorem for System Design Interviews

Feb 20, 2025 | Deep Dive

Consistent Hashing for System Design Interviews

Feb 19, 2025 | Deep Dive

February 10 - 16, 2025

1 updates

New Content

Data Structures for Big Data in System Design Interviews

Premium

Feb 14, 2025 | Deep Dive

February 3 - 9, 2025

1 updates

New Content

Database Indexing for System Design Interviews

Premium

Feb 4, 2025 | Deep Dive

January 27 - February 2, 2025

1 updates

New Content

Over-engineering is getting you down-levelled

Jan 30, 2025 | Blog

January 13 - 19, 2025

1 updates

New Content

Numbers to Know for System Design Interviews

Premium

Jan 14, 2025 | Deep Dive

November 25 - December 1, 2024

2 updates

New Content

API Gateway Deep Dive for System Design Interviews

Nov 26, 2024 | Deep Dive

Real-time Updates Pattern for System Design Interviews

Premium

Nov 26, 2024 | System Design

November 18 - 24, 2024

1 updates

New Content

PostgreSQL Deep Dive for System Design Interviews

Premium

Nov 18, 2024 | Deep Dive

September 9 - 15, 2024

4 updates

New Content

Introduction to the Behavioral Interview

Sep 12, 2024 | Behavioral

How to Prepare for Behavioral Interviews

Sep 12, 2024 | Behavioral

5 Keys to Staff-Level System Design Interviews

Sep 9, 2024 | Blog

Cassandra Deep Dive for System Design Interviews

Sep 9, 2024 | Deep Dive

September 2 - 8, 2024

2 updates

New Content

Google Interview Process: A Comprehensive Insider's Guide

Sep 6, 2024 | Blog

Elasticsearch Deep Dive for System Design Interviews

Sep 5, 2024 | Deep Dive

August 5 - 11, 2024

1 updates

New Content

DynamoDB Deep Dive for System Design Interviews

Aug 6, 2024 | Deep Dive

July 22 - 28, 2024

4 updates

New Content

Design a Ticket Booking Site Like Ticketmaster

Jul 26, 2024 | System Design

Design a URL Shortener Like Bit.ly

Jul 25, 2024 | System Design

Design a File Storage Service Like Dropbox

Jul 23, 2024 | System Design

Design Facebook's News Feed

Jul 22, 2024 | System Design

July 15 - 21, 2024

7 updates

New Content

Design YouTube's Top K Videos Feature

Jul 21, 2024 | System Design

Design a Dating App Like Tinder

Jul 20, 2024 | System Design

Design a Coding Platform Like LeetCode

Jul 19, 2024 | System Design

Design a Ride-Sharing Service Like Uber

Jul 18, 2024 | System Design

Design a Messaging App Like WhatsApp

Jul 17, 2024 | System Design

Design a Local Business Review Site Like Yelp

Premium

Jul 16, 2024 | System Design

Design a Stock Trading Platform Like Robinhood

Premium

Jul 15, 2024 | System Design

July 8 - 14, 2024

7 updates

New Content

Design a Collaborative Document Editor Like Google Docs

Premium

Jul 14, 2024 | System Design

Design a Fitness Tracking App Like Strava

Premium

Jul 13, 2024 | System Design

Design a Distributed Cache Like Redis

Premium

Jul 12, 2024 | System Design

Design an Online Auction Platform Like eBay

Premium

Jul 11, 2024 | System Design

Design a Video Streaming Platform Like YouTube

Jul 10, 2024 | System Design

Design a Distributed Job Scheduler Like Airflow

Premium

Jul 9, 2024 | System Design

Design a Web Crawler

Jul 8, 2024 | System Design

July 1 - 7, 2024

4 updates

New Content

System Design Delivery Framework

Jul 7, 2024 | Quick Guide

Design an Ad Click Aggregator

Jul 7, 2024 | System Design

Design Facebook's Live Comments System

Jul 6, 2024 | System Design

Design Facebook's Post Search

Jul 5, 2024 | System Design

June 10 - 16, 2024

1 updates

New Content

Kafka Deep Dive for System Design Interviews

Jun 12, 2024 | Deep Dive

May 20 - 26, 2024

1 updates

New Content

Understanding the Differences between Meta's SWE Product Architecture and System Design Interviews

May 24, 2024 | Blog

May 13 - 19, 2024

1 updates

New Content

Two-Pointer Overview

May 15, 2024 | Content

April 29 - May 5, 2024

1 updates

New Content

Meta's Product Architecture Interview: How to Prepare

May 1, 2024 | Blog

April 22 - 28, 2024

1 updates

New Content

System Design Interview Patterns

Apr 25, 2024 | Quick Guide

March 11 - 17, 2024

1 updates

New Content

System Design Key Technologies

Mar 15, 2024 | Quick Guide

February 12 - 18, 2024

4 updates

New Content

Meta People Management Interviews Explained by a Former Meta Interviewer

Feb 15, 2024 | Blog

Tips for Meta EM Interviews

Feb 12, 2024 | Blog

Fixed Length Sliding Window

Feb 12, 2024 | Content

Variable Length Sliding Window

Feb 12, 2024 | Content

February 5 - 11, 2024

4 updates

New Content

Redis Deep Dive for System Design Interviews

Feb 9, 2024 | Deep Dive

Stack Overview

Feb 8, 2024 | Content

System Design in a Hurry

Feb 5, 2024 | Quick Guide

Core Concepts for System Design Interviews

Feb 5, 2024 | Quick Guide

January 22 - 28, 2024

2 updates

New Content

Intervals Overview

Jan 25, 2024 | Content

System Design Requirements Gathering

Jan 24, 2024 | Blog

January 8 - 14, 2024

1 updates

New Content

Design a Local Delivery Service like Gopuff

Jan 8, 2024 | System Design

January 1 - 7, 2024

92 updates

New Content

Data Structures and Algorithms Introduction

Jan 1, 2024 | Content

Depth-First Search Introduction

Jan 1, 2024 | Content

Breadth-First Search Introduction

Jan 1, 2024 | Content

Linked List Overview

Jan 1, 2024 | Content

Binary Search Overview

Jan 1, 2024 | Content

Heap Overview

Jan 1, 2024 | Content

Backtracking Overview

Jan 1, 2024 | Content

Greedy Algorithms Overview

Jan 1, 2024 | Content

Trie Overview

Jan 1, 2024 | Content

Prefix Sum Overview

Jan 1, 2024 | Content

Binary Trees Overview

Jan 1, 2024 | Content

Sort Colors

Jan 1, 2024 | Content

2-Sum (Sorted Array)

Jan 1, 2024 | Content

Valid Triangle Number

Jan 1, 2024 | Content

Move Zeroes

Jan 1, 2024 | Content

Trapping Rain Water

Jan 1, 2024 | Content

Three Sum

Jan 1, 2024 | Content

Container With Most Water

Jan 1, 2024 | Content

Swap Nodes in Pairs

Jan 1, 2024 | Content

Remove Nth Node From End of List

Jan 1, 2024 | Content

Linked List Cycle

Jan 1, 2024 | Content

Palindrome Linked List

Jan 1, 2024 | Content

Reorder List

Jan 1, 2024 | Content

Maximum Depth of Binary Tree

Jan 1, 2024 | Content

Adjacency List

Jan 1, 2024 | Content

Number of Islands

Jan 1, 2024 | Content

Pacific Atlantic Water Flow

Jan 1, 2024 | Content

Validate Binary Search Tree

Jan 1, 2024 | Content

Surrounded Regions

Jan 1, 2024 | Content

Flood Fill

Jan 1, 2024 | Content

Path Sum

Jan 1, 2024 | Content

Count Vowels

Jan 1, 2024 | Content

Subarray Sum Equals K

Jan 1, 2024 | Content

Longest Repeating Character Replacement

Jan 1, 2024 | Content

Maximum Average Subarray

Jan 1, 2024 | Content

Maximum Sum of Distinct Subarrays with Length K

Jan 1, 2024 | Content

Maximum Sum of Subarrays with Length K

Jan 1, 2024 | Content

Longest Substring without Repeating Characters

Jan 1, 2024 | Content

Maximum Points You Can Obtain From Cards

Jan 1, 2024 | Content

Level Order Sum

Jan 1, 2024 | Content

Zigzag Level Order

Jan 1, 2024 | Content

Maximum Width of Binary Tree

Jan 1, 2024 | Content

Rightmost Node

Jan 1, 2024 | Content

01 Matrix

Jan 1, 2024 | Content

Rotting Oranges

Jan 1, 2024 | Content

Minimum Knight Moves

Jan 1, 2024 | Content

Graphs Overview

Jan 1, 2024 | Content

Bus Routes

Jan 1, 2024 | Content

Combination Sum

Jan 1, 2024 | Content

Solution Space Trees

Jan 1, 2024 | Content

Generate Parentheses

Jan 1, 2024 | Content

Subsets

Jan 1, 2024 | Content

Word Search

Jan 1, 2024 | Content

Meeting Rooms

Jan 1, 2024 | Content

Employee Free Time

Jan 1, 2024 | Content

Merge Intervals

Jan 1, 2024 | Content

Insert Interval

Jan 1, 2024 | Content

Non-Overlapping Intervals

Jan 1, 2024 | Content

Decode Ways

Jan 1, 2024 | Content

Word Break

Jan 1, 2024 | Content

Unique Paths

Jan 1, 2024 | Content

Maximum Profit In Job Scheduling

Jan 1, 2024 | Content

Longest Increasing Subsequence

Jan 1, 2024 | Content

Maximal Square

Jan 1, 2024 | Content

Solving a Question with Dynamic Programming

Jan 1, 2024 | Content

Counting Bits

Jan 1, 2024 | Content

Prefix Matching

Jan 1, 2024 | Content

Implement Trie

Jan 1, 2024 | Content

Find K Closest Elements

Jan 1, 2024 | Content

Kth Largest Element in Array

Jan 1, 2024 | Content

Merge K Sorted Lists

Jan 1, 2024 | Content

K Closest Points To Origin

Jan 1, 2024 | Content

Gas Station

Jan 1, 2024 | Content

Best Time to Buy and Sell Stock

Jan 1, 2024 | Content

Jump Game

Jan 1, 2024 | Content

Greedy Overview

Jan 1, 2024 | Content

Implement Trie

Jan 1, 2024 | Content

Course Schedule II

Jan 1, 2024 | Content

Course Schedule

Jan 1, 2024 | Content

Topological Sort

Jan 1, 2024 | Content

Monotonic Stack

Jan 1, 2024 | Content

Valid Parentheses

Jan 1, 2024 | Content

Largest Rectangle in Histogram

Jan 1, 2024 | Content

Decode String

Jan 1, 2024 | Content

Daily Temperatures

Jan 1, 2024 | Content

Longest Valid Parentheses

Jan 1, 2024 | Content

Search In Rotated Sorted Array

Jan 1, 2024 | Content

Apple Harvest

Jan 1, 2024 | Content

Spiral Matrix

Jan 1, 2024 | Content

Rotate Image

Jan 1, 2024 | Content

Matrices Overview

Jan 1, 2024 | Content

Set Matrix Zeroes

Jan 1, 2024 | Content

November 27 - December 3, 2023

1 updates

New Content

The System Design Interview: What is Expected at Each Level

Nov 30, 2023 | Blog

October 30 - November 5, 2023

2 updates

New Content

System Design Interview Fundamentals: Mastering Estimation

Nov 2, 2023 | Blog

Understanding Job Levels at FAANG Companies

Nov 1, 2023 | Blog

October 16 - 22, 2023

1 updates

New Content

Story Crafting 101: Constructing Engaging Behavioral Interview Stories

Oct 16, 2023 | Blog

October 2 - 8, 2023

1 updates

New Content

SWE Interviews at Meta Explained by Former Meta Interviewer

Oct 3, 2023 | Blog

September 25 - October 1, 2023

1 updates

New Content

The Top 20 Companies Hiring Without LeetCode-Style Question

Sep 27, 2023 | Blog

August 7 - 13, 2023

2 updates

New Content

The Power of Practice: Mock Interviews for Software Engineering

Aug 11, 2023 | Blog

The Role of Soft Skills in a Software Engineering Interview

Aug 10, 2023 | Blog

July 3 - 9, 2023

1 updates

New Content

Interviewing as an Experienced SWE

Jul 5, 2023 | Blog

May 8 - 14, 2023

1 updates

New Content

The Art of the Example: Nailing Your FAANG Behavioral Interview

May 9, 2023 | Blog

Stay Updated

We're constantly adding new content to help you ace your interviews. Check back regularly for the latest system design breakdowns, deep dives, and interview preparation materials.