11 Mistakes To Avoid On A Technical Interview

You’re in for a technical interview. They ask you a question, and you have to build a system or to write some code, either on a whiteboard (brr!), on a piece of paper, or on a laptop at home. And then you discuss it with the interviewer.

Some enjoy it, and some dread it. But if you are going through it, it means the end of the process is near! And you really want to show the best side of yourself.

I led more than 120 interviews. Here are some common mistakes I noticed the candidates make.

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Unit-testing: best practices

I have unit-tested my code for many years.

While building a GIS-system, we really cared about our product quality. Our users’ needs demanded the app to work properly. I had all critical and/or complex parts of code 100% test-covered, with multiple paths and corner cases. It was such a pleasure to find a bug, fix it, write a couple of¬†tests for this surprise scenario, and be sure it won’t break again. Ah, good times.

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How to answer the question “What’s the most challenging task you have ever implemented?”

Many developers tell what they have done. They used Kafka, RabbitMQ and Kubernetes. They sharded, scaled and clustered. They moved the logic from monoliths to microservices. They built castles and teared down mountains.
What they often don’t say is why they did it.

I often ask this question on interviews:

“What is the most interesting or challenging task you have ever done?”

The answer tells me a lot.

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Little Geo Stories: Square Miles

How I sensed a bug while not seeing any, and what came of it.

Dear reader,

Today I found a place on our website where we display the size of a recreational area in square kilometers.

199 km²

I cannot fully explain what happened next, but I had a hunch something must be wrong with this feature.

Narrator: there was.

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