Senior Growth Engineer

Our mission at Ello is simple and urgent: Maximize the potential of every child, everywhere.

We’re building the world’s first AI teacher to close that gap: one that listens, speaks, adapts, and inspires, just like the best human educators.

Our first product, Read with Ello, is already helping tens of thousands of kids each week learn to read. It listens as they read aloud, offers support when they stumble, and generates magical, personalized stories using generative AI. It works—and kids love it.

Now, we’re scaling that success into something even bigger: a complete AI teacher for all children. We’re building a real-time learning platform—one that combines language, speech, and memory to power personalized, interactive education for kids worldwide. We’re moving fast: we ship weekly, test directly with kids and families, and push the boundaries of what AI can do in education.

With the resources of the world's top investors and the heart of a public benefit corporation, we’re here to revolutionize how children learn globally. Featured on TIME’s Best Inventions and Fortune’s Change the World, Ello is a small, mission-driven team taking on one of the most important challenges of our time: to democratize education.

About the role

We’re looking for a strong Senior Growth Engineer to independently own end-to-end features to improve user acquisition, engagement, and retention for Ello. You will bridge the gap between engineering, product, and marketing to test and implement data-driven growth strategies. You’ll be part of a small and nimble team responsible for the full growth stack, from designing user-facing flows & prototype experiences to developing backend pipelines, experimentation frameworks, and analytics tooling. You are an engineer with a business mindset who enjoys finding leverage through code, loves rapidly iterating based on data, and thrives optimizing funnels and scaling user impact. You are comfortable working full-stack and across multiple programming environments. You have experience building growth features like A/B testing systems, referral programs, onboarding flows, and notifications. You’re highly curious and metrics-driven, with a strong bias toward experimentation and execution.

We welcome candidates from all backgrounds – frontend, backend, growth product – but we prioritize strong technical foundations and proven impact on user or revenue growth. You’ve launched and scaled successful growth initiatives, either at a high-growth startup or as part of a dedicated growth team at a larger company. We work in-person out of our San Francisco office (minimum 3 days/week), and we’re big believers in face-to-face collaboration.

Responsibilities

• Build and own growth features end-to-end, from ideation to deployment

• Develop A/B testing and experimentation frameworks to validate growth hypotheses

• Collaborate with product, marketing, and data to identify high-leverage growth opportunities

• Improve conversion, retention, and engagement across the user lifecycle

• Build and iterate on onboarding, referral, and notification systems

• Analyze user data to generate actionable insights and inform strategy

Required Experience

• Engineering:

  • Strong experience with growth-focused features (e.g. onboarding flows, developing in-app features, emails/notifications, referral loops)

  • Experience with at least one of: Flutter, React (or equivalent web framework), native Android development in Java/Kotlin, or iOS development in Swift/ObjC

  • Leveraged GenAI tools to accelerate your work impact

  • Familiarity with GenAI models & pipelines, including human eval infrastructure

  • Experience with A/B testing infrastructure and analytics tools (e.g. Amplitude, Mixpanel, Segment, Google Analytics)

  • Familiarity with data pipelines, ETL, and writing custom metrics queries

  • Proficient with modern frontend frameworks (React, Flutter) and backend systems (Python, Node.js, Go, or equivalent)

  • Ability to set up and interpret product metrics, dashboards, and cohort analyses

• Growth & Product:

  • Demonstrated experience owning and scaling impactful growth experiments

  • Strong product sense and intuition for user experience and conversion optimization

  • Experience working with marketing teams and customer acquisition funnels

  • Cross-functional mindset: comfortable collaborating across product, design, marketing, and engineering

  • Familiarity with agile development methodologies and collaborative development tools