These offices are not back offices. Engineers in big tech's Indian centres work on the company's own products and the systems underneath them, the same products the company sells everywhere else. A team in India may own part of a cloud service, a payments app or the systems behind an online store outright, and answer for it directly.

Big tech sits apart from the rest of the product world for two reasons. Each company spans many industries at once, so it fits no single corner of the product-companies collection. Each also builds almost everything it depends on itself, from its own data centres and networks to, in some cases, its own chips, so its engineers work on problems at a size few other employers face. That makes big tech different from a GCC, where a bank or a retailer builds software only to run its own business.

This collection covers the five companies one by one, each under its own name. Every company named in this collection has posted software engineering jobs in India.