Lead Growth Engineer

About Ello

Building the world's first 1:1 AI teacher.

Tech

Our stack spans across various technologies, from custom-built in-house real-time ML models, to our consumer-facing mobile app, to internal infrastructure and tools. An overview of the different parts of our tech stack: **AI/Machine Learning** - Custom built child speech recognition model for real-time inference, written in C++ - Python libraries for ML prototyping and training (Pytorch, TensorFlow, sklearn, etc.) - Infrastructure running continuous model training & fine tuning on GCP/AWS - Applied state-of-the-art AI foundation models for adaptive applications & generative content **Mobile App** - Ello mobile app built using Unity (running on iOS/Android/Kindle). - Custom bridging interface connecting Unity app front-end with on-device child speech model & service (ObjC/Swift on iOS and Java/Kotlin on Android) **Web Frontend** - Customer-facing and internal web portals written in React **Backend** - NestJS backend using MongoDB - GraphQL API served over Apollo

The role

Our mission at Ello is simple and urgent: maximize the potential of every child, everywhere. We’re building the world’s first AI teacher—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. It works, and kids love it.Now we’re scaling that success into something even bigger: a complete AI teacher that can help children learn far beyond reading. Our new app combines language, speech, and memory to deliver interactive learning for kids worldwide; check it out[ here](https://www.ello.com/). We ship weekly, test directly with kids, and push the boundaries of what’s possible with AI 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: democratizing education.# **About the role**Ello is entering a new stage of growth, and we’re hiring our first dedicated Growth Engineer to help define and lead how growth engineering works here.You’ll collaborate closely with PMs and key stakeholders to ideate, develop and bring ideas to life. You’ll own the full learning loop that drives features into real business outcomes. Your work spans customer facing product surfaces that carry into the data, experimentation, and operational systems behind them.This is a high-ownership role for someone who wants to help build a function, not simply join one. You might be an exceptional product-minded generalist with a high ceiling, or an experienced growth engineer who brings a craft we do not yet have. We care more about judgment, creativity, agency, and demonstrated impact than a specific number of years.We work in person from our San Francisco office and are big believers in face-to-face collaboration.# **What you’ll do*** Help build Ello’s growth-engineering strategy, operating model, tooling, and standards.* Develop and own growth features end to end across mobile, web, backend, and lifecycle channels—from idea through launch and iteration.* Identify high-leverage opportunities across acquisition, activation, engagement, retention, and referral.* Design and run small, fast experiments; define success metrics; instrument the experience; and turn results into clear next steps.* Improve critical journeys such as onboarding, signup, parent experiences, referrals, notifications, and other growth loops.* Build or evolve experimentation, analytics, and data systems that increase the team’s velocity of learning.* Connect quantitative signals with qualitative insight into children’s and parents’ motivations and behavior.* Partner closely with product, design, engineering, marketing, and company leadership while independently driving work forward.* Bring a distinctive strength to the team and help us raise the bar for growth engineering as the function develops.# **What we’re looking for**The strongest candidates will be excellent in at least two of the following areas and solid in the third:* **Engineering:** You can independently ship high-quality, full-stack product work and build for rapid iteration.* **Growth and product judgment:** You understand funnels, growth loops, user motivation, and how product or incentive changes affect behavior.* **Experimentation and data:** You can define metrics, design and interpret experiments, and use data to make product decisions without waiting for a data scientist.* **Creativity & innovation:** You bring new ideas to the table, derived from first principles of what resonates with our users and their needs.### **You’ll also bring:*** A track record of shipping product or growth initiatives that produced measurable user or business impact.* Strong ownership and a bias to action: you can create something from nothing, turn ambiguity into a plan, and follow through.* Comfort working across the stack. Experience with Flutter, native iOS or Android, React, Python, or comparable technologies is useful; we care most about your ability to learn and deliver.* Hands-on experience with analytics and experimentation tools, such as SQL, Mixpanel, Amplitude, Segment, or equivalent systems.* Strong product sense, including empathy for user motivations and an ability to connect data trends to underlying human behavior.* A collaborative, direct communication style and the ability to work effectively across engineering, product, design, marketing, and business.* The judgment to balance speed with quality and the confidence to ship partial solutions when that is the fastest way to learn.# **Nice to have*** Experience building beautiful & delightful products features or experiences for children and parents.* Experience with consumer growth,sharing, subscriptions, lifecycle systems, or referral products.* Experience integrating third-party systems such as Stripe, Twilio, SendGrid, or CRMs.* Experience using AI tools to increase development velocity or working with AI products and evaluation pipelines.* Experience setting the foundations for or have spun up new function, practice, or team.# **We look for candidates who*** Want to build, experiment, and bring something new to the table.* Have something to teach us and are eager to learn from an excellent team.* Take initiative and full ownership of their work.* Care deeply about craft while valuing the velocity of learning.* Want to make a meaningful impact on child development at scale.* Prefer open, direct communication grounded in empathy.* Act with integrity and want to build meaningful relationships at work.# **Why join Ello*** Build a new growth-engineering function with unusual ownership and room to grow.* Work at the frontier of AI and interactive learning.* See your work reach thousands of families around the world, helping children engage with their learning journey.* Join an exceptional, mission-driven team with a culture of engineering excellence.