From manual scraping to a fully scalable lead engine.
A custom lead-generation engine — live in under three months, processing 25,000 validated leads a day for a growing cold email agency.
Demand outgrew the infrastructure behind it
Hot Inbox is a cold email agency running lead generation and appointment setting for B2B SaaS and service businesses. It was three months old when it hit a client-capacity constraint most agencies would envy — the demand was real, but the lead infrastructure behind it wasn’t built to carry it.
Every new client needed different prospect lists, targeting criteria, and campaign strategies, and each one meant more manual scraping, more time spent cleaning and validating data, and thinner margins from premium data vendors. Off-the-shelf platforms didn’t solve it either: Apollo’s data went stale at scale, Clay and ZoomInfo priced out the volume Hot Inbox needed, and one-size-fits-all tools couldn’t flex across clients.
Delivery still ran through the founder, who was building other ventures at the same time. Hot Inbox didn’t need another tool. It needed end-to-end infrastructure built around how the agency actually operated. That’s when they found Agent Loopr.
A lead engine built like a business, not a script
We worked in Embedded Mode, coordinating directly with the account managers running client delivery — so the system was built around real operating workflows, not assumptions about them.
A multi-source engine, not a single tool
Seven sourcing workflows — Google Maps, AnyMailFinder, Crunchbase, LinkedIn Sales Navigator, ICP segmentation, Captain Data, and GenSpark — cover different client verticals and strategies. It started on n8n; once volume proved out, we rebuilt the scraping automations in Python with Claude Code for scale.
7sources
integrated end to end
Personalization at 25,000 sends a day
An AI agent running on Claude Opus 4.8 reads every prospect’s name, title, and company context and normalizes it against Hot Inbox’s lead rules before it reaches a campaign — so messages at full volume read as personally written, not blasted.
ClaudeAPI
normalizing every lead
Automated QA before every lead ships
Every lead clears deduplication, formatting, and schema checks before it reaches a client campaign, so quality never depends on someone catching it manually.
<2%
bounce rate at full volume
Full ownership, zero developer tickets
The system was handed off complete. Hot Inbox runs and extends it today with no dependency on outside engineering to keep it alive.
0tickets
to operate day to day
What a production lead engine actually delivered
From kickoff to live in under 3 months
Built and shipped in under three months, in Embedded Mode alongside the Hot Inbox team — a 20-person agency running live client operations throughout the build.
Full volume from day one, no ramp-up
The system launched already processing 25,000 validated leads a day at a sub-2% bounce rate — capacity built in before the first campaign went out, not scaled up after.
A tenth of the cost, without cutting quality
Lead costs landed around $100 per 10,000 validated leads — roughly a tenth of what Apollo, Clay, or ZoomInfo would cost at this volume.
New revenue within two months of launch
Hot Inbox locked in 8 retainer clients at $8–10k a month each within two months of go-live — $64–80k in new MRR, roughly $770–960k annualized — with 20–25 more qualified leads in pipeline.
If it weren't for Shivam and his team, we wouldn't have a lead generation system that helps us serve both ourselves and our clients with real results. The speed at which his team works is commendable. Shivam truly understands both the tech and business sides — which uniquely positions him to help founders grow their business online.
Tools and technologies
used on this project
Sourcing & Enrichment
Seven integrated sources covering every client vertical, from local businesses to enterprise decision-makers.
Intelligence Layer
Reads and normalizes every lead before it reaches a campaign
Automation & Delivery
Sourcing automations rebuilt for volume and speed.
One coherent stack — access, commerce, and analytics, production-ready at launch.
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