tl;dr Visual Studio Code usage is rising rapidly! VS Code is now the editor chosen by the majority of engineers during programming interviews, and it appears to be rapidly taking market share from other top editors.

Triplebyte interviews hundreds of engineers every week. For each interview, we record the editor, language and operating system used. We don't use this information to decide who passes our interview (I don't think that would be fair). However, it is fascinating data! It gives us insight into which tools different cohorts of engineers prefer, and how these preferences change over time. It also allows us to identify correlations between the tools engineers choose and their performance during programming interviews.

My co-worker Mike wrote a post about this data a year ago. But Triplebyte has grown a LOT since then, and we now have enough data to dive much deeper. That's my goal for this blog post.

Editor Usage Rates

To get started, I pulled data on the editors used during all interviews conducted over the last year:

The first thing that jumps out from this graph is the prominence of Visual Studio Code. With 17% of the pie, VS Code was the editor used by the plurality of Triplebyte candidates last year. This was a surprise to me for two reasons. First, VS Code is a relatively new product from Microsoft, and, second, last year it didn't even appear on our charts—its share was small enough to fall into the “other” bucket.

To get a better view of this, I graphed the same data over time:

Yikes! VS Code is eating everyone else's lunch! The story here is pretty clear. Over the past year, VS Code usage has gone from 5% to 22%. Over the same time, Sublime Text usage has fallen from 17% to 11%, and Atom usage has fallen from 11% to 6%. Even Eclipse is falling. And VS Code is accelerating every month. Google Trends shows the same thing:

VS Code is on the rise and is poised to become the most dominant editor we've ever seen. Maybe I should give it a try!

Interview Pass Rates

Editor usage is only one part of the story, however. Not all usage is equal. I wanted to see which editors are used by the best programmers. To look at that, I pulled data on how Triplebyte candidates performed during our interview, grouped by the editor they used:

This chart shows the rates at which each editor's users pass our interview compared to the mean pass rate for all candidates. First, notice the preeminence of Emacs and Vim! Engineers who use these editors pass our interview at significantly higher rates than other engineers. And the effect size is not small. Emacs users pass our interview at a rate 50% higher than other engineers. What could explain this phenomenon? One possible explanation is that Vim and Emacs are old school. You might expect their users to have more experience and, thus, to do better. However, notice that VS Code is the third best editor—and it is brand new. This undercuts that narrative a bit (and makes VS Code look even more dominant).

Do Emacs and Vim users have some other characteristic that makes them more likely to succeed during interviews? Perhaps they tend to be more willing to invest time and effort customizing a complex editor in the short-term in order to get returns from a more powerful tool in the long-term?

On the negative end, engineers who use Eclipse, intelliJ and Visual Studio pass our interview at lower rates. What do Eclipse, IntelliJ and Visual Studio have in common? Well, they are all IDEs. However, PyCharm is also a full-featured IDE, and it shows a high pass rate. What else could be going on? Another distinguishing feature of Eclipes, IntelliJ, and Visual Studio is their strong association with Java and C#, so might we merely be seeing the result of a correlation between specific editors and specific languages?

To investigate this, I looked at interview pass rates by language as well:

Java and C# do have relatively low pass rates, although notice that Eclipse has a lower pass rate than Java (-21.4% vs. -16.7), so we cannot fully explain its poor performance as Java dragging it down.

Also, what's going on with Go? Go programmers are great! To dig deeper into these questions, I looked at editor usage by language:

The percentages on this graph are per editor. So we can see, for example, that 97% of engineers using PyCharm program in Python (which makes sense — it's in the name). Eclipse is dominated by Java (94%) and Visual Studio is mostly C# and C++ (88%). I can't really say which way the causality goes, but it seems that both the languages (Java, C#) and the IDEs (Eclipse, Visual Studio) are associated with lower pass rates in interviews. This data comes from our internal interviews, but the same result holds for interviews conducted by the outside companies who use our platform.

Triplebyte does not take language or editor selection into account when making interview decisions. And there are tons of great C# and Java programmers out there (and we've helped many of them get jobs with companies on our platform). However, it seems that the average C# or Java engineer who goes through our process does less well than the average Ruby or Go engineer. I have no idea why.

Another finding from this chart is the difference between VS Code and Sublime. VS Code is primarily used for JavaScript development (61%) but less frequently for Python development (22%). With Sublime, the numbers are basically reversed (51% Python and 30% JavaScript). It's interesting that VS Code users pass interviews at a higher rate than Sublime engineers, even though they predominately use a language with a lower success rate (JavaSript).

Experience / Location

To wrap things up, I sliced the data by experience level and location. Here you can see language usage by experience level:

Again, rows sum to 100%, so the chart shows what percentage of people with a given level of experience use each language. Most notable here is how popular Python and Java are among candidates with only internships or part time experience. Are we seeing folks who recently graduated from college using the languages in which they were taught?

Then there's editor usage by experience level:

First off, you can see VS Code usage dropping off as experience level increases. It's definitely more popular among junior engineers. You can also see that Vim and Emacs are more popular among more experienced engineers. It seems plausible that this is indeed the main reason why Vim and Emacs users have such a high pass rate in our interviews.

Finally, we looked at the relationship between location and language used:

I like this chart for what it says about Bay Area geography. On the peninsula, where larger companies tend to be located, you see a lot of Java developers. In San Francisco, where startups dominate, you see more JavaScript.

Conclusions

Here's a summary of the trends in tool usage we saw over the past year along with some intriguing relationships between the tools engineers choose and their programming ability:

Visual Studio Code is on the rise. Over the past year, it has become the most popular editor across the board, and it's gaining ground every month. I wonder if the editor landscape is experiencing a tectonic shift, from a relatively fractured market to a world in which a single editor has over 50% of the market?

Engineers who use old school editors like Vim or Emacs tend to be strong programmers. That said, this finding may be best explained by the fact that these editors are especially popular among more experienced engineers.

Engineers who use Go are also especially strong. If you know why, please let me know.

Engineers who use Eclipse or Visual Studio do less well (on average) in our interviews. This correlation still stands for interviews with external companies who use our platform.

Take all of this with a grain of salt. I want to end by saying that we don't think any of this is causative. That is, I don't recommend that you start using Emacs and Go (or stop using Eclipse and Java) on the basis of this data. There are strong programmers who use every set of tools. The most important thing in any interview is using the tool that you are most comfortable with.

I would really appreciate your feedback. I have a lot of questions about this data, and I would love to know what other programmers think about what we've seen over the past year. Email Ammon at ammon@triplebyte.com or Lyn at lyn@triplebyte.com!

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