Junior AI Engineer

📋 Description

• • As a Junior AI Engineer at Ruby Labs, you will contribute to building production-ready LLM experiences for a Direct-to-Consumer AI product, working within a modern tech stack to implement AI-powered features that drive innovation in health, education, and entertainment.
• • Day to day, you will implement AI-powered product features, write and manage production prompt templates, integrate structured output schemas, build output enforcement mechanisms, participate in prompt experimentation and A/B testing via OpenRouter, contribute to evaluation pipelines using Langfuse, write clean TypeScript code in Next.js/Node.js, engage in code reviews, document technical decisions, and collaborate with product, growth, data, and billing teams.
• • Ruby Labs is a leading tech company creating innovative consumer products across health, education, and entertainment, with a focus on building the future of consumer-led AI products through a passionate, fast-moving engineering team.
• • In this role, you will grow rapidly by shipping real AI features to production under senior guidance, gain hands-on experience with LLM observability and evaluation tooling, deepen your expertise in prompt engineering and structured outputs, and develop full-stack AI engineering skills in a collaborative, high-impact environment.