Product Engineer

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.

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 Cedar 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.

Cardinal is a system of action sitting on top of every GTM data source — CRMs, enrichment APIs, LinkedIn, intent signals, website visitor data. Our job is to make all of that feel like one beautifully designed product, not a plumbing project. You'll work directly with the founders, ship to production every week, and have an outsized influence on what the product becomes.

We'd love to meet you if you:

Philosophy: You're your own worst critic. You don't ship at 90%. You don't just file the bug — you fix it. You move fast without confusing fast for sloppy.