Calvin Lee, a talented engineer, joined fintech startup Ramp, co-founded by Karim Atiyeh and Eric Glyman, which quickly achieved a billion-dollar valuation by focusing on efficient corporate credit card solutions. Ramp's innovative approach, leveraging AI and automation, has allowed it to grow rapidly and challenge established players like American Express in the corporate credit card market. With significant funding, Ramp aims to transform how companies manage their spending through advanced financial services.