Overview Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: About The Role At Ruby Labs, we’re seeking a senior AI Engineer (Node.js / Next.js / Type Script) to shape our AI infrastructure and drive production-ready LLM experiences. You’ll work in a modern stack, making data-driven decisions around model performance, reliability, and cost. You’ll own advanced prompt systems, structured outputs, and complex LLM workflows using Lang Chain or Llama Index. Observability, debugging, and evaluation are core to the role, leveraging Langfuse and AI gateways like Open Router to continuously improve model quality and operational efficiency. You’ll take full ownership of key AI features from ex...