Kjel Halsey Schlemmer

GTM Engineer · Brooklyn, NY

Most GTM teams buy their tooling. I build mine. I carry a sales quota at hackajob and ship the prospecting, calling, and follow-up systems the team runs on in production. I'm looking for a GTM engineering role with harder problems and more complex motions, somewhere I can keep building and keep learning.

Email me GitHub LinkedIn Experience

Selected work

Quiver

In production

The US team’s prospecting tool: hiring signals, account enrichment, contact discovery, draft outreach with human review, and handoff to Salesloft and Salesforce.

+26% team cold pipeline

FastAPI React Clay Salesforce Salesloft

Creel

In use

A companion for parallel-dialer call blocks. Shows account context the moment a prospect answers, then turns recordings into dispositions, tasks, and follow-up drafts.

1,921 calls processed

Chrome MV3 Node Claude API Deepgram

Telescope

In production

A hiring-history database. Detects each company’s ATS, ingests postings weekly, and scores hiring velocity by region and department.

15,000 companies tracked weekly

Python Flask PostgreSQL Railway

Skills

Engineering

Python (FastAPI, Flask, asyncio) · TypeScript, React, Node · Chrome MV3 · PostgreSQL, SQLite · OAuth 2.0, webhooks, JSON-RPC · Docker, Railway

AI

Claude API: structured outputs, tool use, prompt caching, MCP · evals and quality gates · model tiering and cost control · Claude Code

GTM systems

Salesforce (SOQL, Reports API) · Clay · Salesloft · Nooks · LeadIQ, Lusha · ATS APIs · enrichment pipelines, scoring and routing, deliverability

Experience

10/2025 – Present

hackajob

New York · AI talent-matching platform

Outbound Sales and GTM Engineer

Carry a full outbound quota on the US team while building and operating its internal tooling.
Designed, built, and deployed Quiver, the prospecting platform the team starts each day in: hiring signals, cheapest-first enrichment, Clay-verified contacts, drafted outreach with human review, Salesloft handoff.
Built Creel, a call-block companion that shows account context on answer and turns recordings into dispositions, tasks, and follow-up drafts.
Built Telescope, a hiring-history database across 16+ ATS platforms that scores hiring velocity and feeds Quiver as its signal layer.
Buyer targeting is learned from Salesforce meeting outcomes; every model call is logged with cost; 545 tests ship with the model mocked.
Wrote Quiver’s GDPR data-protection review for the company’s DPO.

2/2023 – 3/2025

Klir

New York · Water-compliance SaaS

Account Executive · Interim Solutions Engineer · SDR

Account Executive (3/2024 to 3/2025): 120% average quota attainment as the sole transactional rep; $754K pipeline generated, $70K closed in Q4 2024.
Interim Solutions Engineer (1/2024 to 3/2024): owned technical discovery and daily enterprise demos; turned recurring objections into product requirements.
Sales Development Representative (2/2023 to 1/2024): sourced enterprise deals contributing to $600K+ ARR; promoted to AE within a year.

6/2022 – 1/2023

CompStak

New York · Commercial real-estate data

Business Development Representative

112% average quota attainment.
Built Salesforce and Salesloft automations for BDR-to-AE lead handoff.

Get in touch

kjelkjel2@gmail.com

Email me GitHub LinkedIn