@onkeshgupta

Onkesh Gupta

@onkeshguptaDelhi, IndiaJoined August 2026

Breaking Systems. Learning Why. Building Better.

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The Engineering Notebookonkeshgupta.hashnode.dev7 posts

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OGOnkesh Guptaonkeshgupta.hashnode.dev4d ago · 6 min read

Design Patterns Simplified #2: Factory Method

The Problem You are building the payment flow for an app. First requirement: support Stripe. Simple. Somewhere in your checkout code, you write: StripeGateway* gateway = new StripeGateway(); gateway->

OGOnkesh Guptaonkeshgupta.hashnode.devSep 3 · 7 min read

Design Patterns Simplified: Creational, Structural & Behavioral - The Map Before The Territory

You just finished SOLID. Five principles, five "aha" moments, five checkmarks. Nice. Then you open a design patterns cheat sheet for the first time and see 23 of them. Singleton. Factory. Adapter. Dec

OGOnkesh Guptaonkeshgupta.hashnode.devSep 1 · 8 min read

SOLID Principles Simplified #5: Dependency Inversion Principle

The Problem You're building a NotificationService for your app. First requirement is to send notifications over email. Simple enough. You write an EmailSender class and inside NotificationService, you

OGOnkesh Guptaonkeshgupta.hashnode.devAug 25 · 8 min read

SOLID Principles Simplified #4: Interface Segregation Principle

The Problem You're building a Printer interface for an office automation system. First requirement: Print the documents. Sounds easy. So you add print() method. Two weeks later: "Hey, can it also scan

OGOnkesh Guptaonkeshgupta.hashnode.devAug 22 · 6 min read

SOLID Principles Simplified #3: Liskov Substitution Principle (LSP)

Okay... That sounds much more complicated than it needs to be. What does "usable wherever" actually mean? Let's forget the definition for a moment and start with a problem. Imagine this... You are bui

Onkesh Gupta

About

Available for

Onkesh Gupta's blogs

Recently published

Design Patterns Simplified #2: Factory Method

Design Patterns Simplified: Creational, Structural & Behavioral - The Map Before The Territory

SOLID Principles Simplified #5: Dependency Inversion Principle

SOLID Principles Simplified #4: Interface Segregation Principle

SOLID Principles Simplified #3: Liskov Substitution Principle (LSP)

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Onkesh Gupta

About

Available for

Onkesh Gupta's blogs

Recently published

Design Patterns Simplified #2: Factory Method

Design Patterns Simplified: Creational, Structural & Behavioral - The Map Before The Territory

SOLID Principles Simplified #5: Dependency Inversion Principle

SOLID Principles Simplified #4: Interface Segregation Principle

SOLID Principles Simplified #3: Liskov Substitution Principle (LSP)