@onkeshgupta

Onkesh Gupta

@onkeshguptaDelhi, IndiaJoined August 2026

Breaking Systems. Learning Why. Building Better.

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The Engineering Notebookonkeshgupta.hashnode.dev9 posts

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OGOnkesh Guptaonkeshgupta.hashnode.dev3d ago · 7 min read

SOLID Principles: 30 Interview Questions That Actually Test Understanding

Most SOLID interview prep stops at definitions. "What is the Single Responsibility Principle?", "What does OCP stand for?" You can answer those from a glossary without ever having felt the pain the pr

OGOnkesh Guptaonkeshgupta.hashnode.devSep 17 · 8 min read

Design Patterns Simplified #3: Abstract Factory

You're building the backend for a furniture store's website. Customers can order two things right now, a Chair and a Sofa. Both come in two styles: Modern and Victorian. You start simple. A ChairFacto

OGOnkesh Guptaonkeshgupta.hashnode.devSep 8 · 9 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

Onkesh Gupta

About

Available for

Onkesh Gupta's blogs

Recently published

SOLID Principles: 30 Interview Questions That Actually Test Understanding

Design Patterns Simplified #3: Abstract Factory

Design Patterns Simplified #2: Factory Method

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

SOLID Principles Simplified #5: Dependency Inversion Principle

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Onkesh Gupta

About

Available for

Onkesh Gupta's blogs

Recently published

SOLID Principles: 30 Interview Questions That Actually Test Understanding

Design Patterns Simplified #3: Abstract Factory

Design Patterns Simplified #2: Factory Method

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

SOLID Principles Simplified #5: Dependency Inversion Principle