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Ruby Labs

Junior AI Engineer

Ruby Labs

. Implement AI-powered product features and workflows based on specifications from senior engineers.

Posted 4/20/2026full-timeRemote • 🇹🇷 TurkeyJuniorWebsite

Tech Stack

Tools & technologies
JavaScriptNext.jsNode.jsTypeScript

About the role

Key responsibilities & impact
  • Implement AI-powered product features and workflows based on specifications from senior engineers.
  • Write, iterate on, and manage production prompt templates, following established patterns for dynamic prompting and context injection.
  • Integrate structured output schemas (JSON mode, function calling, Zod/JSON schemas) to ensure AI responses are predictable and application-ready.
  • Build and maintain output enforcement mechanisms such as validators and repair loops under senior guidance.
  • Participate in prompt experimentation workflows — drafting variants, running A/B tests across models via OpenRouter, and documenting results.
  • Contribute to evaluation pipelines and help score prompt/model quality using Langfuse.
  • Write clean, maintainable TypeScript code within the Next.js / Node.js stack.
  • Participate in code reviews and incorporate feedback.
  • Document technical decisions and system behaviour to support knowledge sharing.
  • Collaborate with product, growth, data, and billing teams to deliver features on time.

Requirements

What you’ll need
  • Working knowledge of Node.js, Next.js, and TypeScript.
  • Basic understanding of how LLMs work and hands-on experience using LLM APIs (OpenAI, Anthropic, or similar).
  • Experience writing prompts that go beyond simple instructions — e.g., using variables, templates, or conditional logic.
  • Familiarity with structured outputs (JSON mode, function calling, or schema validation).
  • Understanding of basic web application architecture and RESTful APIs.
  • Curiosity and willingness to learn quickly in a fast-moving AI product environment.
  • Strong communication skills and a collaborative mindset.

Benefits

Comp & perks
  • Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
  • Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
  • Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.
  • Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
  • Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
TypeScriptNode.jsNext.jsJSONfunction callingZodprompt engineeringA/B testingLLM APIsRESTful APIs
Soft Skills
communicationcollaborationcuriositywillingness to learn