Systems | Development | Analytics | API | Testing

Debugging has always been part of the craft. But in today’s systems — distributed, asynchronous, and increasingly opaque — debugging is no longer just difficult. It’s fragmented. Despite better tooling, more telemetry, and the rise of AI-assisted workflows, many developers still experience the same core frustrations when trying to understand what’s actually happening in production.

If you’ve ever debugged a Node.js application in production, you’ve likely seen this: Sourcemaps were supposed to solve this. And technically, they do. But in practice, most teams still struggle to make sourcemaps available when they’re actually needed.

Ask any DevOps lead where their team loses time, and the answer isn’t “We just need one more automated test.” The real drag on DevOps velocity comes from the convoluted testing platforms teams are forced to wrestle with. While automation and AI integrations are often promoted as the solution, complexity quietly strangles productivity long before code hits production.

It goes without saying that crash debugging is crucial. For app quality, for App Store ratings, for compliance with Apple’s ecosystem. And if you’re new to the concept of debugging (or you simply want to top up your knowledge) this guide will give you a complete toolkit of tips and instructions. We’ll explain the most common iOS crash debugging scenarios and show you how to diagnose and fix them quickly.

The JavaScript debugger statement is a built-in keyword that tells the JavaScript engine to pause execution at a specific line of code. When execution stops, you can inspect variables, function scope, and the call stack using developer tools. It is commonly used during development to analyze how values change and where logic breaks, without relying on repeated logging or assumptions. No more guesswork. No more partial truths.

Production bugs that only reproduce in actual traffic can be some of the most frustrating bugs in software development. You can stare at your logs, add traces to your code, add instrumentation – and still not be able to see the actual requests that went over the wire. And that gets even harder when the requests are encrypted and the system is a black box. You can use tools like Wireshark or Kubeshark to capture the requests.

An effective JavaScript debugging regime is essential if we want to build responsive, reliable and highly-rateable Android apps. JavaScript doesn’t enforce types at compile time (unlike Swift) and this means errors often happen quietly, when users are already feeling them. So it’s vital that we debug pre-emptively, using knowledge rather than guesswork.

There's a common belief in the observability space: if you just collect more data, you'll have what you need to debug any issue. The reality is more frustrating: even with 100% unsampled observability, you're still missing critical debugging data. There's a common belief in the observability space: if you just collect more data, you'll have what you need to debug any issue. The reality is more frustrating: even with 100% unsampled observability, you're still missing critical debugging data.

Remote debugging is the most reliable way to grasp what’s really happening inside a mobile app once it’s out in the wild. We’re talking crashes that never appear in development, and issues from users that can’t be reproduced locally. If you ship mobile apps, you’ve been vexed by these problems at some point.

APIs rarely fail loudly. Most of the time, they break quietly while dashboards stay green. These silent failures are often the hardest to detect and the most damaging for users. I learned this while dealing with real production traffic. Everything looked normal until users started complaining. Let’s explore more about how this works.