Zack Dominick is a Global Category Manager at Klaviyo, where he strategizes, manages, and executes contracts across a $100M+ OPEX portfolio, serving as the dedicated GTM Category Manager for Marketing, Sales, and Customer Success. Since joining Klaviyo in 2022, he has built and maintained relationships across 15+ departments and 100+ key stakeholders, and has led 100+ software negotiations spanning Global IT, Marketing, Sales, CS&S, and R&D, with enterprise experience across vendors like Salesforce, HubSpot, Tableau, Adobe, Gong, Clari, and ZoomInfo, among many others. In 2026 alone, Zack has driven $2.2M in value through strategic renewal and net-new contract negotiations, while also scaling Klaviyo's Procure-to-Pay process to absorb 150%+ growth in request volume without adding headcount. He has been instrumental in onboarding AI tools to drive efficiency across GTM teams and has pioneered new approaches to procurement and indirect sourcing using agentic platforms and LLMs. Before Klaviyo, Zack spent four years at Boston Scientific in sourcing and procurement roles of increasing responsibility, delivering millions in savings and value across facilities, legal, sales, customer success, marketing and IT indirect sourcing categories, and plastics, resins and chemicals direct sourcing categories. He holds a B.S. in International Business with a concentration in Global Supply Chain Management from Bryant University.