According to the survey by talent acquisition startup Belong, Amazon had the highest number of registered users on Github, followed by Cognizant, TCS and Microsoft.
The survey covered 75,000 Indian engineers that have a presence on GitHub - one of the largest communities where software developers host and review code.
The report said most of the top 200 contributors do not work for the big brands. As many as 67 per cent of the top 200 contributors work for product and service companies with less than 200 employees, indicating that hiring for quality developers does not equate to sourcing from big names.
The report further said while women take up 26 per cent of tech jobs in India, the percentage of women active on open- source in the country is just 6 per cent. Amazon, Microsoft, Cisco and Thoughtworks have the highest female open-source contributors.
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The survey further noted that open-source culture is of key importance for tech companies to attract the best developers.
"In 1990s and early 2000s, organisations used to have more of a patent driven IP protectionist culture. Today, we are seeing big companies open source some of their hard-core IP and innovations," said Belong's CTO Vinodh Kumar Ravindranath.