Peter MacDiarmid/Getty Images Wall Street investment banks are spending more on tech and eliminating rote tasks that used to go to junior staff. But the banks aren't cutting back on their crops of recent college grads — if anything, they're relying more on younger workers. Analysis of FINRA records by efinancialcareers shows that nearly one-fifth of Finra-licensed employees at the big New York banks are brand new to the business.