Headway is a service that helps fast-growing startups with capacity constraints, customer retention, launching new products, adding new features, increasing revenue per customer, going after new customer segments, building a design system, and discovering new business opportunities. They offer full product teams, design sprints, design systems, UX audits, product analytics and insights, customer discovery, and Jobs-To-Be-Done research. Their approach involves diagnosing before prescribing, validating assumptions, and designing for progress with transparency and open communication.