Hi, I'm

WJ Boshoff

Software Engineer, Java / Spring Boot · C# / .NET · AWS

I'm a backend-leaning software engineer. I spend most of my time in the Java / Spring Boot and C# / .NET worlds, wrangling authentication, distributed systems, and the small matter of shipping to production without everything catching fire.

When I grow up, I want to be a cloud engineer. I'm reliably informed this is mostly the same fires, just billed by the hour and spread across more availability zones. So for now I'm collecting AWS certs and quietly learning which buttons not to press.

This site is where I write that thinking down, and where I keep the things I build and solve for fun. Have a look around, and say hi.

Latest writing

All case studies →

AWS29 June 20268 min read

ECS vs EC2 is the wrong question

A study note on why ECS is not an alternative to EC2, what I think the practice questions are really asking, and what I would pick once I understood the layers.

AWS EC2 ECS Fargate Containers

Software29 June 20269 min read

Why HashMaps in Java are so cool

A study tour of HashMap internals, the small engineering decisions that keep it fast in the bad cases, and the contract on the user side that quietly breaks it.

Java Data Structures JVM Hashing

29 June 20262 min read

Why I built this

A short note on why this site exists, and what it is for.

Explore

Case Studies

Long-form technical deep dives on AWS internals, software, and system design.

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Blog

Shorter, looser, more frequent notes on what I am working on.

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Problem Solving

Soon

LeetCode and algorithm walkthroughs, with the reasoning, not just the answer.