Revenue Agents for GTM teams. Backed by Y Combinator.
About the role
As a Product Engineer at Cardinal, you'll work on the surfaces our customers — founders, GTM leaders, sales engineers — live in every day. That includes our sequence and enrollment system (per-lead customization, multi-sender, conditional branching), the agent layer (the embedded AI agents that draft, research, and enroll on behalf of the user), and the eval and observability tooling that lets customers trust an AI to run their pipeline.
What they're looking for
- Have founded a company, been an early engineer at a YC-stage startup, or shipped a product 0→1
- Have built or worked at a GTM/sales/CRM/enrichment tool — Apollo, Outreach, Clay, Attio, HubSpot, Salesforce, Gong, Common Room, or anything in that orbit
- Are a power user of GTM tools yourself — you've actually run outbound, written sequences, and fought with deliverability
- Have worked on real-time collaborative interfaces, agent UIs, or eval/observability tooling
- Care about design at the level of Linear, Attio, Raycast, or Vercel — and have shipped UIs at that quality bar
More about this role
About Cardinal
Cardinal ( trycardinal.ai ) is the AI-native outbound sales platform replacing the SDR-and-GTM-engineer stack that companies cobble together today with Apollo, Outreach, Clay, and a few engineers gluing them all together.
We're a YC W26 company. In our first few months we've grown to $80K+ MRR, with 50+ YC companies and a growing roster of post-Series-A startups running their outbound on us. We've raised over $5M from Audacious, Burst Capital, and YC, and we're targeting $10M ARR by mid-2026.
We're a small, dense, design-obsessed team. The bar for engineering taste, product instinct, and aesthetic quality is very high — if you've ever opened Linear or Attio and thought "why doesn't every B2B tool feel like this," that's the bar.
As a Product Engineer at Cardinal, you'll work on the surfaces our customers — founders, GTM leaders, sales engineers — live in every day. That includes our sequence and enrollment system (per-lead customization, multi-sender, conditional branching), the agent layer (the embedded AI agents that draft, research, and enroll on behalf of the user), and the eval and observability tooling that lets customers trust an AI to run their...
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