Key Takeaways
An AI SDR system built on Clay, Instantly, and n8n replaced a 4-person human SDR team for a B2B SaaS company. The system performs: intent signal monitoring across LinkedIn, G2, Bombora, and hiring boards; ICP scoring on 18 criteria; personalised multi-channel outreach via email and LinkedIn; qualification conversation via AI; and calendar booking via Calendly API. Output: 340 personalised outreach sequences per week versus 80 from the human team. Demo booking rate: 4.2% versus 3.1% human baseline. Cost: £3,200/month in AI infrastructure versus £220,000/year for 4 SDRs. Qualified pipeline generated in first 90 days: £1.4M.
Why the Client Had to Make the Switch
Four SDRs. £220,000/year fully loaded. 80 outreach sequences per week. 2.1 demos booked per SDR per week. Pipeline contribution: £800k/quarter. The problem wasn't the team's performance — it was the ceiling. Adding a 5th SDR would cost £55k and produce marginally better output. The economics of human SDR scaling are brutal: each hire adds cost linearly but adds pipeline sublinearly because the best leads are taken first and the marginal lead quality declines. They needed a different architecture.
The System Architecture: 7 Layers
Layer 1 — Intent Monitoring: Bombora intent data, G2 category page visitors, LinkedIn company followers, and hiring signals from job boards. Contacts showing 3+ intent signals enter the prospecting queue. Layer 2 — ICP Scoring: Clay enriches each contact with 18 data points. Proprietary scoring model ranks 0–100. Only contacts scoring >68 proceed. Layer 3 — Research: AI generates a 5-point research brief per company: recent news, funding, tech stack (from BuiltWith), pain indicators from job postings, competitor mentions. Layer 4 — Personalised Sequence: AI writes a 4-step email sequence using the research brief. Each sequence is unique — not a template swap. Layer 5 — LinkedIn Parallel: Automated LinkedIn connection + message sequence runs in parallel with email. Layer 6 — Qualification AI: When a prospect replies, AI conducts a 4-question qualification conversation. Layer 7 — Booking: Qualified prospects are offered a link to book directly into the rep's calendar.
The Personalisation That Made the Difference
We tested two personalisation levels. Version A: company name + industry inserted into a fixed template. Version B: AI-generated opening paragraph using the 5-point research brief — referencing a specific company announcement, a pain indicator from their job postings, or a mutual connection reference. Version B produced 2.8× higher reply rates. The extra cost per outreach: $0.04 in AI API tokens. The ROI on personalisation is one of the clearest we've ever seen. The key insight: buyers reply to emails that demonstrate research, not emails that demonstrate volume.
The Metrics at 90 Days
Outreach sequences per week: 80 (human) → 340 (AI). Reply rate: 6.4% versus 5.8% human baseline. Demo booking rate: 4.2% versus 3.1%. Demos booked per week: 5.2 (human) → 14.3 (AI). Qualified pipeline in 90 days: £1.4M versus £800k/quarter human pace. Cost: £3,200/month AI infrastructure + £1,800/month our management retainer = £5,000/month versus £220,000/year (£18,333/month). The 4 SDRs were redeployed — 2 to account executive roles (they now close instead of prospect), 2 to customer success.
What the AI System Can't Do
The AI doesn't handle complex multi-stakeholder conversations. When a prospect replies with a 400-word detailed question about integration architecture, a human AE takes over. The handoff is automatic — any reply over 80 words or containing technical specificity triggers a notification to the assigned rep. The AI also can't read tone accurately enough to navigate emotionally charged situations (frustrated prospects, aggressive gatekeepers). The system is designed to get prospects to a human conversation — not to replace the human entirely. The boundary matters.
Ready to implement this in your business?
Book a free AI Audit. 90 minutes. We'll map your highest-value opportunities and hand you a prioritised implementation plan.
Book My AI Audit