Learn from our experience developing the Deliveroo product.

How to debug memory usage of a JVM-based application

What do you do when your JVM-based application gets OOM killed or exhibits wild memory usage pattern? In this blog post, I will explore some tools and concepts we can use to start debugging this problem.

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Monte Carlo Power Analysis

Take advantage of computing power and empirical data to use Monte Carlo simulation to perform experiment power analysis.

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How to use Charles Proxy to rewrite HTTPS traffic for web applications

Charles Proxy is an application that sits between your computer and the Internet to record HTTP(S) traffic. Most importantly for me, it has the ability to also modify a server’s HTTP response. I’ve been using Charles over the past few weeks to rewrite responses from our APIs and I’ve been slowly learning what Charles is capable of but also what it isn’t. Needless to say, there’s still a lot to learn, but the defining moment for me was when I was able to recreate a production bug, by replaying the JSON payloads to my local development server causing the same error to be raised.

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