Three kinds of heavy equipment
Who buys, and how they are sold. The buyers are construction contractors, mining companies, farmers and rental companies. The makers usually sell through independent dealers, who also service the machines and supply spare parts. A machine works hard for many years and wears out its parts. So spare parts and service earn the maker and the dealer a steady income long after the sale.
Why these makers hire software engineers. The machines are now connected.

The makers employ large numbers of engineers to design the machines and write this software. Many of them are in India.
Every company named here has posted software engineering jobs in India. Famous companies that don't actively hire software engineers in India are left out.
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Continue with Google- Machines for construction, mines, farms and airports

Construction and mining
Farm machines
One company here works at airports instead
One company covered mainly in another Market Segment also works here:
Haul trucks with no driver already run in mines. Tractors are following. They steer themselves, and spray only the weeds their cameras see. The heavy-equipment makers are becoming software companies. The software that lets a machine drive itself is among the most demanding engineering work in this Industry Vertical.
Who these companies hire, and for what, is on What manufacturing tech companies hire for.