Senior AI Engineer - Remote LLM Systems & Automation

Ruby Labs Ltd; Atlanta (GA); Remote; USD 140,000 - 230,000; Full time

Benefits offered by this job

Paid National Holidays

Independent Contractor Agreement

Work from anywhere

Job summary

Ruby Labs is seeking a Senior AI Engineer to own and scale the AI layer of a core D2C subscription product. You’ll be responsible for production LLM features, browser automation, prompt systems, evaluation, observability, and model selection from experiment to live release.

You’ll work in a modern TypeScript stack—Next.js, Cloudflare Workers, and containers—driving reliable, cost-aware AI features with measurable impact and strong ownership.

Qualifications

• 5+ years of software engineering with Node.js, TypeScript, Next.js, and Postgres, including edge or serverless runtimes such as Cloudflare Workers.
• Production experience with dynamic prompting and structured outputs in live systems.
• Experience with unified LLM APIs or AI gateways (OpenRouter, Cloudflare AI Gateway) for reliable prompts and cost control.
• Decision-making based on benchmarks and trace data, not intuition.

Responsibilities

• Own and scale the AI layer for a core D2C subscription product.
• Design and maintain prompt systems with conditional context and robust evaluation pipelines.
• Build and manage browser automation for reliable end-to-end flows.
• Publish and version automations as reusable, safe-to-roll-back workers.
• Conduct A/B tests across models/prompts and monitor results with a gateway.

Skills

Node.js

TypeScript

Next.js

Postgres

LLM workflows

LangChain

A/B testing

Observability

Tools

Playwright

Browserbase Functions

Cloudflare Workers

Hono

Hatchet

Langfuse

LlamaIndex

Vercel

Supabase/Drizzle

Job description

Ruby Labs is seeking a Senior AI Engineer to own and scale the AI layer of a core D2C subscription product. You’ll be responsible for production LLM features, browser automation, prompt systems, evaluation, observability, and model selection from experiment to live release.

You’ll work in a modern TypeScript stack—Next.js, Cloudflare Workers, and containers—driving reliable, cost-aware AI features with measurable impact and strong ownership.