Lead lists built like an engineer, not an intern

The list is the campaign

Copy gets the credit, but the list decides the outcome. A mediocre sequence sent to a precise, verified, well-segmented list beats brilliant copy sent to a scraped CSV every single time. Bad lists don't just underperform — they burn your sending infrastructure with bounces and spam complaints that take weeks to recover from.

How we build

• ICP definition first — industry, size, geography, tech stack, and the trigger that makes someone buy now. If we can't describe who we're excluding, the ICP isn't done.
• Source routing — Apollo for standard B2B roles; maps and local data sources for SMB and trades; specialized sources where the niche demands it. One source never fits all.
• Clay enrichment waterfalls — multiple providers tried in sequence per data point, so you pay for a found email once instead of paying three vendors to fail separately.
• AI research columns — Claygent answers the qualification questions that don't exist in any database: what the company actually does, who they serve, what changed recently. (We wrote about cutting Claygent research costs with open-weight models.)
• Verification before send — every email checked, catch-alls handled conditionally, and risky rows quarantined. Target bounce rate: under 3%.
• Segmentation and variables — lists ship segmented by angle with personalization variables ready for sequences, so copy plugs straight in.

What you receive

A campaign-ready list with fill-rate and verification stats, segment breakdowns, and the personalization columns your sequences need — delivered into your sending tool and CRM, not just a spreadsheet. Most engagements pair list building with cold email infrastructure or an AI calling agent so the list goes to work the week it's delivered.

FAQ

How big should a cold outreach list be?

Smaller and sharper than most expect. A 2,000-contact list segmented into three angles outperforms 10,000 loosely-matched rows — and it protects deliverability. We size lists to your sending capacity so data never sits and decays.

What data sources do you use?

Apollo as the B2B backbone, Clay as the enrichment layer across dozens of providers, plus maps-based sourcing for local businesses and niche sources where needed. Source choice follows your ICP — that routing is half the value.

Is every contact verified?

Yes — every deliverable email passes verification before it ships, with conditional handling for catch-all domains. Verification is why our clients' campaigns stay under a 3% bounce rate, which is what keeps domains healthy.