Shashank’s Substack

Design a system to notify users when a certain stock price changes by a given delta.

Functional Requirements (FRs) for a system that notifies users when a certain stock price changes by a given delta

Nov 1 • 

Shashank Mishra

October 2025

Design a Cache-as-a-Service (CaaS) for a multi-tenant environment.

Let's look into FR

Oct 21 • 

Shashank Mishra

1

Develop a Photo Sharing Platform like Flickr or Google Photos

Let's look into fr

Oct 15 • 

Shashank Mishra

Design a feature that accepts reviews from customers.

Let's discuss

Oct 13 • 

Shashank Mishra

1

Design a Trending Topics System with focus on: count-min sketch, sliding window, ranking

Breakdown of the functional requirements for a Trending Topics System with focus on count-min sketch, sliding window, and ranking:

Oct 4 • 

Shashank Mishra

1

September 2025

Design Remote File Sync Service

Remote File Sync Service with focus on delta sync, conflict detection, and versioning:

Sep 28 • 

Shashank Mishra

2

Design Image Hosting Service

Let's look into FR

Sep 21 • 

Shashank Mishra

Server to Server Callback and it's uses

A server-to-server callback (often called S2S callback or postback) is when one server communicates directly with another server in the background…

Sep 14 • 

Shashank Mishra

Design a system to build marketplace Feature for Facebook

Let's look into FR

Sep 2 • 

Shashank Mishra

August 2025

Design Pattern to be used in Google Calendar(LLD)

Designing Google Calendar involves many complex components and features. Given its wide range of functionality, various design patterns can be applied…

Aug 26 • 

Shashank Mishra

How does Dynamo DB uses Multi-paxos for replication

Let's dissect

Aug 17 • 

Shashank Mishra

July 2025