Selleris is a GTM engineering firm for B2B SaaS and tech-enabled companies. Scattered data. Missed buying signals. Follow-ups that never happen. We build one revenue system inside your HubSpot: account data and scoring, visitor identification, AI search visibility, signal-based outbound, AI agents, lifecycle automation and reporting. You own it from day one. Your HubSpot. Your data. Your playbooks. Your licenses. Custom agents run in your own Azure tenant. Our Glass Box standard: published pricing, visible work, zero software markup and documented systems your team can run without us. Selleris Revenue Loop is our six-month program. When the data supports it, your SOW includes a day-90 qualified-pipeline floor. If we miss it, Loop Operations are free until we hit it. 42 engineers and architects. Engineering in Warsaw. Selleris LLC in New York. Microsoft partner. Start with a free diagnostic. Bring your growth target. Leave with the pipeline math.