What Is Sales Development Representative (SDR)?

A Sales Development Representative (SDR) is a specialized sales role focused exclusively on the top of the funnel — prospecting, outbound outreach, lead qualification, and booking meetings for Account Executives (AEs). Unlike full-cycle sales reps who handle everything from prospecting to closing, SDRs concentrate on the high-volume, repetitive work of filling the pipeline with qualified opportunities. This division of labor allows AEs to spend more time on discovery calls, demos, and closing, which directly accelerates revenue. The SDR role emerged in the early 2000s as companies adopted Aaron Ross's Predictable Revenue methodology, which demonstrated that separating prospecting from closing created more scalable and predictable pipeline generation. Today, the SDR function is standard across B2B SaaS, technology, and professional services companies. Typical SDR responsibilities include researching target accounts, identifying the right contacts within those accounts, crafting personalized outreach across email, phone, and LinkedIn, handling initial responses, qualifying leads against established criteria, and scheduling meetings for AEs. SDR performance is measured through activity metrics and outcome metrics. Activity metrics include calls made, emails sent, LinkedIn messages sent, and accounts worked. Outcome metrics — which matter more — include meetings booked, meetings held (accounting for no-shows), SQLs generated, and ultimately pipeline value created. Top-performing SDRs typically book 12-20 qualified meetings per month, though this varies significantly by market segment, deal size, and outreach channel mix. The SDR role faces significant challenges. Rep turnover averages 30-40% annually due to the repetitive nature of the work and burnout from constant rejection. Average ramp time to full productivity is 3-4 months. These economics create a compelling case for AI augmentation. Tasks like prospect research, initial personalization, follow-up sequencing, and data entry — which consume 60-70% of an SDR's day — can be automated, allowing human SDRs to focus on the highest-value conversations. Prospect AI represents the evolution of SDR augmentation, where AI agents handle the bulk of research, outreach creation, and multi-channel execution, while human reps focus on the warm conversations and relationship-building that AI cannot replicate. This hybrid model typically doubles or triples the effective output per human SDR.