Senior Engineer (Growth)

Location: San Francisco
Reports to: Head of Growth

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.

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.

• 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

• 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.

• 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.)

• YC W26 — breakout startup

• Real enterprise traction before Demo Day

• Small team, big ownership

• San Francisco-based, working on hard problems