Senior AI Engineer

Stack

Responsibilities

• ▹Deliver major AI features end-to-end and own production stability of AI systems
• ▹Own AI output quality, structure, and predictability across user-facing interactions
• ▹Integrate and orchestrate multiple LLM providers via OpenRouter, managing model selection and fallback strategies
• ▹Design agentic, tool-using AI workflows, defining clean tool contracts including MCP-based tools
• ▹Build multi-step LLM workflows using orchestration frameworks such as LangChain or LlamaIndex
• ▹Design and manage production prompt systems with dynamic prompting and context injection
• ▹Run Langfuse-based evaluation pipelines and A/B tests across models
• ▹Monitor AI system metrics, quality signals, latency, and release health
• ▹Write clean, scalable TypeScript across the Next.js/Node.js stack with strong error handling

Requirements

• ▹Experience owning production AI systems end-to-end
• ▹Experience integrating and orchestrating multiple LLM providers
• ▹Experience designing agentic, tool-using AI workflows
• ▹Experience with LangChain or similar orchestration frameworks
• ▹Strong TypeScript and Node.js skills
• ▹Experience with prompt engineering and experimentation

Soft skills

About the company

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.