GTM Engineer
Karl Kyamko
I build the systems that turn a cold list into booked calls: signals and enrichment in Clay, AI scoring and personalisation, sending infrastructure that lands in the inbox, and AI reply handling.
GTM Engineer
I build the systems that turn a cold list into booked calls: signals and enrichment in Clay, AI scoring and personalisation, sending infrastructure that lands in the inbox, and AI reply handling.
Tools I Work With
CodexI'm a GTM Engineer based in Cebu, Philippines. I've run B2B cold email since 2021 and built in Clay since 2023, so I cover both halves of the job: the system that finds and scores the right accounts, and the sending setup that gets the email into the inbox.
My GTM Engineering journey started in 2023 with Clay — the platform that later coined "GTM Engineer" as its own category. It solved problems generic lead-gen tools couldn't handle (multi-source enrichment, waterfall logic, AI-assisted research at scale), and it opened the door to building outbound as a system, not running it as a manual campaign.
Today I build signal-based outbound end to end: ICP and market mapping, signals and enrichment in Clay, AI scoring and personalised copy, domains and mailboxes, sending in Instantly, and AI reply handling. I've built it for agencies selling to e-commerce brands, built StellarVerifier, an email verification product, from the ground up, and I run Lead Gen AI Systems.
Outbound only works when every layer is wired together — sourcing, enrichment, verification, authenticated infrastructure, sending, and CRM handoff. I build and run it as one system, not a stack of disconnected tools.
I built and ran the full sending setup; the first opportunity came in week one and later closed as a $5K MRR retainer.
Read the case study → TikTok Shop Agency
Precision list building instead of generic scraping, on authenticated sending infrastructure.
Read the case study → Meta Ads Agency
Every lead checked against the ICP by hand before a single email went out.
Read the case study → Cold Email
Leading with a problem the lead already feels generated 6 opportunities and $30K in pipeline value from 1,140 leads.
Read the case study → Cold Email
Leading with a flipped belief earned a 28.57% positive reply rate and 4 opportunities from 729 leads.
Read the case study → Cold Email
Leading with what the problem costs generated 3 opportunities and $15K in pipeline value from 766 leads.
Read the case study → Supplement Brand
Fully cold outreach recruiting TikTok Shop creators for a flat-fee paid campaign.
Read the case study → Podcast
Fully cold outreach booking TikTok Shop affiliates with 1M+ GMV as podcast guests.
Read the case study → SaaS
An email verification product I built end to end, with a live SMTP verification engine.
Read the case study →
Founder, Amazon Channel Management Agency
"Amazon brand just signed. LFG! We did it guys, in a lot sooner fashion than I thought. Great job team, fantastic job, Karl Kyamko. Let's keep it going."
I build the systems behind outbound: ICP and market mapping, signals and enrichment in Clay, AI scoring and personalisation, the sending setup (domains, mailboxes, DNS, warm-up), and AI reply handling through to the booked call. Then I run them, test the messaging and keep what converts.
Yes. I'm looking for a full-time GTM Engineer role on a team that runs outbound for B2B companies. I also take scoped system builds. Always remote.
Cebu, Philippines. I work with teams across US and EU timezones and keep hours that overlap both.
With the ICP and the offer: who feels the problem daily, who is in-market right now, and who owns the budget. Then the list and signals in Clay, the sending setup, and a small test of 2 to 3 messaging angles before scaling the winner.
No, and I'd be wary of anyone who does for cold email. What I commit to is properly authenticated infrastructure, disciplined ICP targeting, and honest reporting on the numbers.
Book a call. Thirty minutes, no pitch — I'll look at your setup and tell you straight whether I can help.
Open to full-time GTM Engineer roles and outbound system builds. Based in Cebu, Philippines, working remote across US, UK and EU hours.
