Practical notes on building reliable software by Arunkumar Ganesan

Finding Performance Bottlenecks in a Serverless Microservice Chain

A practical guide to tracing, profiling, fixing, and proving performance issues across API Gateway, ALB, ECS Fargate, PostgreSQL, and DynamoDB.

JVM OOM: When the Leak Is in a Library

A data rich JVM memory troubleshooting case study using JFR, heap dumps, Eclipse Memory Analyzer, and a real Netty classloader leak.

Protect the Time That Builds Software

A practical article about protecting the time of strong engineers, reducing low value meetings, and keeping builders focused on meaningful software impact.

Real Time APIs or Events: Choose by the Shape of the Work

A practical guide to choosing real time APIs or event based architecture, including pros, cons, and a checkout example.

Linear Data Structures: How to Choose the Right One

A practical guide to arrays, linked lists, stacks, queues, and deques with operation complexity, code examples, memory hooks, and when to use each one.

Microservices Are Not the Default Answer

A practical case for why microservices are not the solution for everything, and how to decide when the independence is worth the operating cost.

Use the Ambassador Pattern When Connectivity Should Move Out of the App

A practical method for deciding when an ambassador belongs beside an application, with a service connectivity example and clear reasons to avoid it.

A Practical Framework for Bringing People Along While Building

A hands on leadership framework for setting context, naming tradeoffs, inviting useful input, and closing the loop while building important work.

Java 21 Is the Practical Upgrade for Modern Java Teams

A focused case for Java 21 as the new runtime baseline, covering the changes that matter most for support, concurrency, latency, and safer application code.