At Brex, Brianna led the Startups segment as part of the product marketing team. As Brex shifted its broader strategy toward serving large enterprises, she was brought in to bridge the gap with early-stage startups and ensure the company remained the go-to financial platform for founders. This included driving innovative marketing campaigns, developing refreshed product positioning tailored to startup needs, crafting messaging for sales collateral, and forming strategic partnerships with key players like AWS, Carta, Rippling, Y Combinator, Techstars, and leading early-stage investors. Additionally, she oversaw the go-to-market strategy, messaging, and launch of key integrations with platforms like Rippling, 1Password, Firstbase, and AngelList Stack.

She also created brand moments that resonated deeply with customers, from virtual masterclasses with industry thought leaders like Harry Stebbings, to curated founder dinners and events in key tech hubs, a video series focusing on founder mental health, and surprising customers with their very own (and often first!) billboard in Times Square.