AI Engineer

📋 Description

• • As a senior AI Engineer at Ruby Labs Ltd., you will shape the company's AI infrastructure and drive production-ready LLM experiences, playing a critical role in advancing consumer-led products across health, education, and entertainment industries.
• • Day to day, you will design advanced prompt systems, implement structured outputs using JSON schemas and function calling, build evaluation pipelines with Langfuse, debug LLM chains via tracing, conduct AI A/B testing across models like Claude 3.5 Sonnet and GPT-4o via OpenRouter, and make data-driven deployment decisions based on quantitative benchmarks and trace analytics.
• • Ruby Labs is a fast-growing tech company creating innovative consumer products, with a modern stack focused on Node.js, Next.js, and TypeScript, and a culture that values ambition, impact, and continuous improvement through data and experimentation.
• • In this role, you will deepen your expertise in LLM observability, prompt engineering, model evaluation, and AI system optimization, while gaining ownership over key AI features from experimentation to live production in a remote-first, high-impact environment.