AI Engineer

AI EngineerMachine Learning EngineerFull TimeRemoteSeniorTeam 11-50Since 2018H1B No SponsorCompany SiteLinkedIn

Location

Spain

Posted

38 days ago

Salary

0

Seniority

Senior

Bachelor DegreeEnglishJavaScriptNext.jsNode.js

Job Description

AI Engineer

Ruby Labs

• Advanced Prompt Engineering: Designing complex, dynamic prompt templates with conditional logic and efficiently reusing information and context within prompts to maximize generation quality and reasoning. • Structured Outputs & Schemas: Implementing various response schemes (JSON mode, function calling, Zod/JSON schemas) to ensure AI outputs are predictable and ready for seamless integration into application logic. • Prompt Engineering & Evaluations: Building robust evaluation pipelines and using Langfuse to collect feedback and score the quality of responses in real time. • Tracing & Debugging: Performing deep debugging of complex LLM chains using Langfuse traces to identify bottlenecks and optimize for cost, latency, and context window usage. • AI A/B Testing: Running systematic experiments across different models via OpenRouter (e.g., comparing Claude 3.5 Sonnet vs. GPT-4o) and analyzing results based on quantitative metrics. • Data-Driven Decisions: Making deployment decisions for new prompts or models strictly based on quantitative benchmarks and trace data, rather than intuition. • Output Scoring & Analysis: Developing scoring systems to analyze the “Problem → Solution” chain and identify root causes of hallucinations or logic errors using Langfuse analytics. • Model Performance & Fine-Tuning: Regularly re-evaluating model performance as new architectures emerge and performing fine-tuning when necessary to meet specific domain requirements.

Job Requirements

  • Node.js & Next.js: Deep knowledge of the stack to build reliable services and handle complex LLM-generated data.
  • Dynamic Prompting Skills: Proven experience in building prompts where content is highly dependent on input variables and context injection.
  • OpenRouter Experience: Experience working with unified APIs, managing rate limits, and selecting the most cost-effective models for specific tasks.
  • Langfuse (or similar): Understanding of LLM observability principles — setting up tracing, creating test datasets, and integrating scoring systems.
  • Evaluation Methodology: Experience with frameworks like RAGAS or building custom “LLM-as-a-judge” systems.
  • Analytical Mindset: Ability to transform raw generation logs into actionable business metrics and technical insights.
  • Iterative Mindset: Focus on continuous product improvement through constant feedback loops.

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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