Each month, about 50 million people visit Stack Overflow to learn, share, and build their careers. Industry estimates suggest that 20-25 million of these people are professional developers and university-level students. The vast majority of our survey respondents this year said they are professional developers or who code sometimes as part of their work or students preparing for such a career.

See our Methodology section for details on how developers around the world accessed our survey.

About 55% of respondents identify as full-stack developers, and about 20% consider themselves mobile developers. The median number of developer type identifications per respondent this year is three, and the most common combinations include back-end, front-end, and full-stack developer. Pairs that are highly correlated include database administrator and system administrator, DevOps specialist and site reliability engineer, academic researcher and scientist, and designer and front-end developer.

Survey weighting is an approach used to analyze survey data when the survey sample doesn't match the underlying population well. For example, in our survey this year, 12% of US respondents identify as women, but data from the US Bureau of Labor Statistics estimates that women's participation in the software developer workforce is about twice that, more like 20%. We can use survey weighting to adjust for the mismatch between our survey sample and the population of developers. We know that there is a difference in developer type representation by gender, so let's compare the overall proportions in our raw results for the United States with weighted proportions, assuming that we undersampled gender minorities at the rate indicated by the BLS report. When we use weighting, we see small increases in the representation of developer roles that have the most representation from women, like Data Scientists and Academic Researchers, and decreases in others with low representation from women, like DevOps.

We know there are more ways in which our survey sample doesn't match the underlying population of developers than only gender (including frequency of use of Stack Overflow), and the United States is not the only country for which we expect such a mismatch. The reason we're using this specific example of weighting here is that it is one where we know we have systemic sampling issues and we have an estimate about the expected population proportion. We can demonstrate the effect of our survey sample on our results, both in direction and magnitude.

Many developers work on code outside of work. About 78% of our respondents say that they code as a hobby. Other responsibilities outside of software can reduce developers' engagement in coding as a hobby; developers who say they have children or other caretaking responsibilities are less likely to code as a hobby. Respondents who are women are also less likely to say they code as a hobby.

There is a wide range of experience among developers who visit Stack Overflow, from seasoned developers who learned to code more than 30 years ago (approximately 15%), to a sizable percentage of developers (17%) who learned how to code less than five years ago. Of the professional developers on Stack Overflow, approximately 40% learned to code less than 10 years ago. See more on how these experience levels vary by gender.

65% of respondents have been coding professionally for less than 10 years.

Technical executives and engineering managers tend to have the most professional coding experience. Among the individual contributor roles, the most experienced developers tend to be system administrators, database administrators, and developers who create desktop and embedded applications. On the other end of the spectrum, web developers, academic researchers, and data scientists tend to have fewer years of experience. Part of this could be explained by the proliferation of coding bootcamps that teach web development and the amount of data scientists entering the field from academia.

Of all of the respondents, over 54% wrote their first line of code, whether it was a web page or a hello world program, by the age of 16. People who wrote their first line of code in their 20s accounted for 13% of the respondents. When looking at the average age by country, respondents from countries such as Brazil and India tend to start writing code a full two years later compared to developers in countries such as Poland and Germany, who on average start coding by the age of 15.

Approximately 75% of respondents worldwide completed at least the equivalent of a bachelor's degree or higher. This is consistent with what we've seen in previous years.

There are a variety of academic paths to becoming a professional software developer. Of the respondents that write code professionally and studied at the university level, over 62% have a degree in computer science, computer engineering, or software engineering and just under 10% have a degree in another engineering field. Interestingly enough, almost 10% of the respondents have a business related degree or a degree in a humanities, social science, or fine arts field of study.

Almost 85% of the respondents that are professional developers feel that formal education is at least somewhat important, which is contrary to the popular idiom that you don't need formal education to become a developer. However, almost 16% believe that it is not at all important or necessary.

Consistent with the data from last year, we still see evidence that people of color are underrepresented among professional developers. However, we see some improvement when we look at all respondents—not just the ones who code professionally. Despite a gradual change year over year, there is still much work to do to increase participation rates.

When looking at gender identity by country, we see various participation rates of professional developers who are women. Consistent with last year's survey, women developers account for almost 12% of developers in the US. In countries such as Germany, Brazil, and Poland, the participation rate is about half of that, which goes to show there is still much work to do to reach appropriate gender representation in the field. Among the respondents that code professionally, almost 92% are men.

Approximately 1% of this year’s respondents that write code professionally are transgender.

We see varying representation from men and women in different developer roles on our survey. All categories have dramatically more developers who identify as men than women, but the ratio of men to women varies. Developer types above the line have respondents that are more likely than average to be men, and those below the dotted line have respondents who are more likely than average to be women. Developers who are data scientists or academic researchers are about 10 times more likely to be men than women, while developers who are system admins or DevOps specialists are 25-30 times more likely to be men than women. Women have the highest representation as front-end developers, designers, data scientists, data analysts, QA or test developers, scientists, and educators.

When we break down differences in years since learning to code by gender, we notice some retention problems. We see a big drop off at the 10-14 year mark when compared to men, though we've seen some improvement from last year's survey. This is consistent with other research that women leave tech jobs at higher rates than men. If we truly want to make a difference and see gender parity in the industry that is reflective of society, retention is key. It is important to not only hire people from diverse backgrounds, but to also create an environment where they feel included and can thrive.

Participants’ responses regarding their sexual orientation are consistent with previous years.

Among the respondents, almost 15% said they have some type of anxiety, mood, or emotional disorder. When looking at differences in physical ability, around 2% of respondents are differently-abled, such as being blind / having difficulty seeing or being deaf / having difficulty hearing. This underscores the importance of creating accessible software and creating companies that accomodate differently-abled people.

Of the respondents that are professional developers, 70% are under 35 and about 5% are 50 years old or older.

When we break down the age of the survey respondents by country, we see that developers in North America and Western Europe tend to skew older and have more coding experience compared to other regions.

Unsurprisingly, for the eighth year in a row, JavaScript has maintained it's stronghold as the most commonly used programming language. Going further down the list, we also see moderate gains for TypeScript, edging out C in terms of popularity. Additionally, Ruby, once in the top 10 of this list as recently as 2017, has declined, being surpassed by newer, trendier technologies such as Go and Kotlin.

When focusing purely on web frameworks, we see that jQuery is still king, but is slowly losing ground to React.js and Angular year over year. We do see some consolidation, as more than 35% of respondents use jQuery, React, a version of Angular (combining Angular, which represents Angular 2+, and Angular.js) or a flavor of ASP.NET (ASP.NET or ASP.NET Core).

Similar to last year, we asked about many of the other miscellaneous technologies that developers are using. For the second year in a row, Node.js takes the top spot, as it is used by half of the respondents. We also see growth across the board in the popularity of data analysis and machine learning technologies such as Pandas, TensorFlow, and Torch/PyTorch.

When looking at database technologies, the results are mostly consistent with what we observed last year. MySQL has maintained the top spot, followed by PostgreSQL and Microsoft SQL Server. However, we see some slight growth in the popularity of Firebase, which edged out Elasticsearch this year.

Linux and Windows maintain the top spots for most popular platforms, with over half of the respondents reporting that they have done development work with them this year. We also see some year over year growth in the popularity of container technologies such as Docker and Kubernetes.

For five years running, Rust has taken the top spot as the most loved programming language. TypeScript is second surpassing Python compared to last year. We also see big gains in Go, moving up to 5th from 10th last year.

VBA, Objective C, and Perl hold the top spots for the most dreaded languages—languages that had a high percentage of developers who are currently using them, but have no interest in continuing to do so.

If we look at technologies that developers report that they do not use but want to learn, Python takes the top spot for the fourth year in a row. We also see some modest gains in the interest in learning Rust.

ASP.NET Core is the most loved web framework, beating out React.js. Gatsby, a newcomer on the survey, is already sitting at 5th, being loved by 60% of the respondents.

Although it is amongst the most popular web frameworks, Angular.js is also considered to be the most dreaded.

.NET Core and Torch/PyTorch remain the most loved of the other remaining frameworks, libraries and tools. DevOps tools Chef and Puppet are among the most dreaded technologies.

Taking a look at database technologies, Redis remains the most loved, followed by PostgreSQL and Elasticsearch. Anecdotally, Stack Overflow has been using both Redis and Elasticsearch in our tech stack for years, since the early days of the company. IBM DB2 ranked as the most dreaded database and MongoDB remains the database technology that developers want to learn the most.

Linux remains the most loved platform. Container technologies Docker and Kubernetes rank as the second and third most loved. They are also among the platforms that developers most want to learn, which demonstrates how beloved they are. Wordpress is still the most dreaded, but Slack Apps and integrations, newly added to the list this year, rank high at the number four spot.

Almost half of the respondents use Windows as their primary operating system. The rest were almost evenly split between MacOS and a flavor of Linux.

Of the professional developers who responded to the survey, almost 82% use GitHub as a collaborative tool and more than half use Slack.

When researching new tools, over three-fourths of respondents like to try the tool for themselves via a free trial. Social proof is also important, as over 60% of developers ask other developers they know about it or visit developer communities such as Stack Overflow.

With regards to technology purchases within their organization, around 57% of respondents have some or a great deal of influence.

Globally, respondents who use Perl, Scala, and Go tend to have the highest salaries, with a median salary around $75k. Interestingly, Perl is amongst the top most dreaded languages, so it's possible that this high salary is to compensate for the dearth of developers who want to use that technology. When looking only at the US, Scala developers tend to have the highest salaries.

Technologies cluster together into related ecosystems that tend to be used by the same developers. This network graph demonstrates this by showing which technologies are most highly correlated with each other. Similar to last year, we see a large cluster of web development technologies connected via SQL to one for Microsoft technologies, as well as a cluster of operations technologies connected to the Python ecosystem network through Linux.

We asked developers how frequently they learn a new language or framework. Around 75% of respondents noted that they learn a new technology at least every few months or once a year. This demonstrates how quickly innovations happen and developers are constantly learning to keep their skills fresh.

We asked respondents what they do when they get stuck on a problem. Almost 90% reported that they visit Stack Overflow. This is an encouraging sign that we're succeeding in our mission to help people get access to the knowledge they need to get things done.

For the first time, we asked developers how they feel when they search for a coding solution online and the first result link is purple because they already visited the link. About half of respondents chose 'Hello, old friend', which suggests it may be a frequent occurrence for certain tasks. Perhaps this is why over 2.1 million people visited the 'How do I exit the Vim editor?' question on Stack Overflow.

Over 92% of professional developers are employed at least part-time. Roughly 12% of all respondents say they are students.

India has an noticeably higher proportion of students compared to other countries that are well-represented in the survey data. In all of these locations, more than 70% of developers are employed full-time.

For the first time this year, we asked respondents how often they work overtime or beyond the formal time expectation of their job. Over 75% of developers work overtime at least occasionally, defined as one to two days per quarter.

Almost half of the respondents reported that their company has a good onboarding process. About one fifth had no onboarding process at all.

We asked survey takers if their organizations have dedicated DevOps personnel. An equal amount of respondents reported that their company had at least one dedicated employee to handle DevOps as those who reported they had none.

We also asked survey takers about the importance of DevOps to scaling software development. Almost 80% of respondents believed that DevOps is at least somewhat important, with almost half of the respondents noting that it is extremely important.

Overall, developers tend to be satisfied with their jobs, with almost 65% reporting that they are either slightly or very satisfied with their job. On the other end of the spectrum, around 25% are slightly to very dissatisfied.

Almost 83% of respondents reported that they are either not actively looking or interested in new job opportunities. This is consistent with our findings about developer job satisfaction—most developers are happy with their jobs.

When looking across several countries with large developer populations, job satisfaction is mostly consistent. In the US, UK, Germany, and Canada, over 80% of developers are not actively looking for a job, but at least half are open to new opportunities.

If we break out the data by job function, over 20% of academic researchers, data scientists, and data/business analysts are actively looking for a new job, followed closely by designers, game developers, and mobile developers at 19%. This is consistent with findings from past surveys, where we saw that academic researchers and designers were among the roles that had the lowest job satisfaction.

For the first time, we asked developers what drove them to look for a new job. Better compensation was by far the most common factor for respondents with 70% of them noting that more pay was important. Wanting to work with new technologies was the second most popular factor, which is consistent with what respondents reported as one of the most important priorities when choosing between two jobs.

We asked respondents how they learn about a company during a job hunt and received mixed responses. Most respondents turn to reviews on third party sites, such as Glassdoor and Blind. However, a large amount also learn from viewing company sponsored media, such as blogs and company culture videos. Interestingly, relatively fewer respondents seek publicly available financial information, such as data from Crunchbase, which is consistent with respondents noting that company financial performance and fundraising is not a very important factor when deciding to take a job.

We asked the survey respondents if we control for compensation, benefits, and location, what three characteristics would most influence their decision to choose one job offer over another. Overall, the languages and technologies that the developer would be working with was most important, followed by the office environment or company culture and flexibility of schedule. Interestingly enough, the least important factors were the financial performance of the organization (11.4%), the specific team they would be working on (11.2%), and the diversity of the organization (6.6%).

However, if we control for gender, we see some differences in the rankings. For example, among the women respondents, 48% selected company culture to be one of the most important factors and 18% indicated that diversity was also of top importance. Among the non-binary respondents, 49.9% chose office environment and company culture in the top three most important factors and 33.4% strongly valued the diversity of the company.