Infosys Ltd., India’s second-largest software exporter, is tapping demand from U.S. President Barack Obama’s push to overhaul the nation’s health-care system to include an additional 30 million Americans.

The Bangalore-based company has won four state contracts, one valued at more than $100 million, and is vying for business in four more before a 2014 deadline to build online exchanges that will link customers to insurance plans, said Ashok Vemuri, the head of the company’s unit in the Americas. Obama plans to expand medical coverage through the Affordable Care Act, which includes setting up marketplaces where consumers can evaluate and select service providers.