Senior AI Engineer - Remote + Unlimited PTO, High-Impact

Ruby Labs Ltd; Turkey; Remote; TRY 5,994,000 - 8,991,000; Full time

Benefits offered by this job

Remote Work Environment

Unlimited PTO

Paid National Holidays

Company-provided MacBook

Flexible Independent Contractor

Job summary

Ruby Labs Ltd is seeking a Senior AI Engineer to own and scale the AI layer of a core D2C subscription product. You will be responsible for production LLM features and the browser automation surrounding them, from first experiments to live releases, emphasizing quality, reliability, and cost as core metrics.

You will work in a modern TypeScript stack (Next.js, Cloudflare Workers, containers) with Browserbase, Playwright, LangChain, and AI gateways.

Qualifications

• 5+ years of software engineering with Node.js, TypeScript, Next.js, and Postgres, including edge or serverless runtimes such as Cloudflare Workers
• Production browser automation with Playwright (Browserbase or similar): resilient selectors, retries, failure handling at scale
• Production experience with dynamic prompting — content that depends on input variables and injected context
• Structured outputs in production: JSON mode, function calling, Zod/JSON schemas
• Experience with unified LLM APIs or AI gateways (OpenRouter, Cloudflare AI Gateway): rate limits, fallbacks, cost-effective model selection
• LLM observability with Langfuse or similar: tracing, test datasets, scoring integration
• Evaluation methodology: RAGAS or custom LLM-as-a-judge systems

Responsibilities

• Design dynamic prompt templates with conditional logic and context injection that maximise generation quality
• Enforce predictable outputs with JSON mode, function calling, Zod/JSON schemas, validators, and repair loops
• Own complex LLM workflows (LangChain, LlamaIndex, or custom) that integrate cleanly into application logic
• Build and maintain browser automation on Browserbase Functions and Playwright that traverses web flows reliably
• Classify screens with a model inside each traversal, and decide what the model handles versus deterministic code
• Ship automations as frozen, published workers — versioned, reproducible, and safe to roll back
• Orchestrate runs through Hatchet with retries, timeouts, and failure traces that explain every broken run
• Build evaluation pipelines — test datasets, LLM-as-a-judge, RAGAS-style metrics — and score responses and screen classifications in Langfuse
• Trace complex LLM chains to find bottlenecks in cost, latency, and context-window usage
• Run A/B experiments across models and prompts through an AI gateway (OpenRouter, Cloudflare AI Gateway); release only on quantitative benchmarks
• Re-evaluate models as new architectures emerge; fine-tune when domain requirements demand it
• Take AI features from experiment to live production on Cloudflare Workers and Containers, and stay accountable after release
• Manage rate limits, fallbacks, and model cost so features stay reliable at scale
• Resolve production incidents in owned AI and automation systems with documented root-cause analysis
• Decides on benchmarks and trace data, not intuition
• Analytical — converts generation logs into metrics a business can act on
• Iterative — builds feedback loops and improves continuously
• Owns the outcome from experiment to production, and after
• Verifies before trusting — treats LLM output as unproven until validated

Skills

Node.js

TypeScript

Next.js

PostgreSQL

Playwright

Browser automation

JSON schemas

LLM prompts

Langfuse observability

AI gateways

Tools

Browserbase

Hono

Hatchet

Drizzle

Supabase

Vercel

LangChain

LlamaIndex

OpenRouter

Cloudflare Workers

Containers

Job description

Ruby Labs Ltd is seeking a Senior AI Engineer to own and scale the AI layer of a core D2C subscription product. You will be responsible for production LLM features and the browser automation surrounding them, from first experiments to live releases, emphasizing quality, reliability, and cost as core metrics.

You will work in a modern TypeScript stack (Next.js, Cloudflare Workers, containers) with Browserbase, Playwright, LangChain, and AI gateways.