The stablecoin boom has been good to crypto wallet technology provider Dfns. In some ways, a bit too good. Co-founder Clarisse Hagège, who raised $16 million for her startup in January, is expanding to meet demand from clients in the stablecoin field. But the crypto tokens’ growing popularity has kicked off a race for talent, making it difficult — and expensive — to fill 17 open roles at her 42-person firm. “People are paying a lot,” she said....