Each month, about 40 million people visit Stack Overflow to learn, share, and level up. We estimate that 16.8 million of these people are professional developers and university-level students.
Our estimate on professional developers comes from the things people read and do when they visit Stack Overflow. We collect data on user activity to help surface jobs we think you might find interesting and questions we think you can answer. You can download and clear this data at any time.
About three-quarters of respondents identify as web developers, although many also said they are working to build desktop apps and mobile apps.
... read the whole story at stackoverflow.com.