Junior AI Engineer
Location
Europe
Posted
1 day ago
Salary
0
Seniority
Junior
Job Description
Junior AI Engineer
Ruby Labs
• 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. • Participate in prompt experimentation workflows by drafting variants, running A/B tests across models via OpenRouter, and documenting results. • 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. • Help implement tool calling and function calling integrations so AI features can fetch data or trigger actions, following patterns established by senior engineers. • Contribute to evaluation pipelines and help assess prompt and model quality using Langfuse. • Write clean, maintainable TypeScript code within the Next.js and 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.
Job Requirements
- 0–2 years of software engineering experience — recent graduates, bootcamp graduates, and early-career engineers are welcome.
- 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, such as using variables, templates, or conditional logic.
- Familiarity with structured outputs (JSON mode, function calling, or schema validation).
- Understanding of basic web application architecture, RESTful APIs, and backend fundamentals, including request validation, error handling, and logging.
- Curiosity and willingness to learn quickly in a fast-moving AI product environment.
- Strong communication skills and a collaborative mindset.
Benefits
- 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.
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