Arvind Kumar – Medium

Arvind Kumar

Pinned

Building a Ticketing System: Concurrency, Locks, and Race Conditions

What happens when 100,000 fans try to book the same concert ticket at exactly 10:00 AM? Let’s design a ticketing system that prevents…

Oct 30

Building a Ticketing System: Concurrency, Locks, and Race Conditions

Oct 30

Pinned

Advanced Spring Boot Concepts Every Java Developer Should Master

Spring Boot’s simplicity often overshadows its power to handle complex enterprise requirements. In this article, lets see the glimpse of 7…

Dec 9, 2024

Advanced Spring Boot Concepts Every Java Developer Should Master

Dec 9, 2024

Pinned

Top 10 design patterns that should be deep dived and learned in year 2025

In 2025 and beyond, software development will continue to evolve with trends like AI-driven applications, cloud-native architectures…

Feb 10

Top 10 design patterns that should be deep dived and learned in year 2025

Feb 10

Before You Memorise Those Requirements for System Design Interviews: Feel the Scale First

Most system design discussions start with a list of non-functional requirements that feel like they were copy-pasted from a template.

8h ago

Before You Memorise Those Requirements for System Design Interviews: Feel the Scale First

8h ago

Java Memory Model Explained — Practical Dialogue, Patterns, Diagrams, and Interview Prep

This article is a practical, conversation-style guide to the Java Memory Model — why visibility and ordering matter, how to use them…

1d ago

Java Memory Model Explained — Practical Dialogue, Patterns, Diagrams, and Interview Prep

1d ago

Building an E-commerce Checkout System: Distributed Transactions, Saga Patterns, and Reliability

How does Amazon process millions of orders daily with 99.99% reliability? When a customer clicks “Place Order,” dozens of microservices…

2d ago

Building an E-commerce Checkout System: Distributed Transactions, Saga Patterns, and Reliability

2d ago

The Myth of “Pick Any Two” — Understanding the CAP Theorem in Distributed Systems

If you’ve been in any system design discussion long enough, someone has probably thrown this line at you:

3d ago

The Myth of “Pick Any Two” — Understanding the CAP Theorem in Distributed Systems

3d ago

When E-Commerce Checkout Meets Two-Phase Commit: The Sweet Illusion of Consistency

While exploring the e-commerce checkout flow, I tried to apply 2-Phase Commit (2PC) and even 3-Phase Commit (3PC) to see how they could fix…

5d ago

When E-Commerce Checkout Meets Two-Phase Commit: The Sweet Illusion of Consistency

5d ago

How to Design a Snake and Ladder Game — Interview Deep Dive

Complete Guide: Game State Management, Multi-Player Coordination, Board Representation, and UI Separation

6d ago

How to Design a Snake and Ladder Game — Interview Deep Dive

6d ago

The Double-Click Problem: How Idempotency Saved Our Checkout System

“I only clicked once, why was I charged twice?” — Every developer’s nightmare in distributed systems.

Nov 3

The Double-Click Problem: How Idempotency Saved Our Checkout System

Nov 3

Arvind Kumar

Arvind Kumar

Staff Engineer | System Design, Microservices, Java, SpringBoot, Kafka, DBs, AWS, GenAI | Teaching concepts via stories & characters | linkedin.com/in/codefarm0

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