Senior Engineer (Growth) — Jinba (YC W26)

Location: San Francisco
Reports to: Head of Growth

About Jinba

Jinba is the enterprise workflow automation platform that lets teams describe workflows in natural language and deploy them as APIs or MCP servers. We have 40,000+ daily enterprise users at Japanese Fortune Global 500 companies — and we're just getting started.

We're part of Y Combinator W26.

The Role

We're hiring a Growth Engineer to own the systems that turn signups into customers. You'll work across the full stack — building landing pages, instrumenting funnels, running in-app experiments — whatever it takes to move the metrics.

This is an engineering role with a growth mindset, not a marketing role with some coding involved. You'll ship real features, run real experiments, and have direct impact on revenue.

What You'll Do

• Build and optimize our marketing site, signup flows, and onboarding

• Design and run A/B tests across the funnel

• Integrate and automate our CRM and lead nurturing systems

• Ship growth features in the product (referrals, usage triggers, activation loops)

• Work directly with the Head of Growth to prioritize high-leverage experiments

What We're Looking For

• Full-stack skills: TypeScript, React, SQL, Python

• Data fluency: BigQuery, Mixpanel (or similar). You can write queries, build dashboards, and pull your own insights

• Product growth experience: You've thought about activation, retention, and conversion — not just features

• Bias to action: You ship fast, measure everything, and iterate

• Comfort with ambiguity: We're early. You'll participate in crafting high leverage hypotheses to test.

Nice to Have

• Ex-technical founder (you've built something from zero)

• Experience at a PLG or developer tools company

• Familiarity with CRM/marketing automation (Loops, HubSpot, Segment, etc.)

Why Jinba

• YC W26 — breakout startup

• Real enterprise traction before Demo Day

• Small team, big ownership

• San Francisco-based, working on hard problems