Startup Square Will More Than Double Staff

Mobile payment startup Square plans to grow from 400 employees to more than 1,000 by the end of next year. The company will move to San Francisco’s mid-Market Street area to accommodate the growth. The new hires are expected to be predominately engineers and designers.

Square will take a couple of floors at 1455 Market Street, less than a block from the headquarters Twitter moved into in June, according to media reports. It expects to move from the San Francisco Chronicle building at Fifth and Mission streets by mid-2013.

The company, which makes credit card readers for smartphones and tablets, will begin processing international payments this year. It recently landed a deal to supply its payment services at 7,000 U.S. Starbucks outlets.