Project Lion - Senior Prompt Engineer - Spain (Remote, Part-Time)

Stack

Responsibilities

• ▹Use Automatic Prompt Generation (APG) tools to create baseline prompts for complex parent-child template clusters
• ▹Run and supervise the Automated Prompt Optimization (APO) tool, review outputs, flag deadlocks or plateaus
• ▹Manually draft, test and refine prompts to navigate complex template architectures and handle edge cases where tooling is lacking
• ▹Monitor shadowbot runs to ensure sufficient human-LLM disagreements are registered and tracked
• ▹Run prompt versions against gold data to measure autorater quality (F1 score, precision, recall)
• ▹Draft technical Launch Certification Documentation

Requirements

• ▹Native fluency in Spanish and fluent English
• ▹Must be based in Spain
• ▹Bachelor's, Master's or Doctorate degree in Computer Science, Data Science, Computational Linguistics, HCI, Cognitive Science or a related field
• ▹At least 4 years of experience as a Prompt Engineer
• ▹Experience tuning LLMs for structured outputs and complex classification tasks, familiarity with chain-of-thought and few-shot learning
• ▹Strong SQL and data analysis skills for identifying error patterns

Nice to have

• ▹Familiarity with enterprise-grade LLM interfaces such as the Goose API
• ▹Experience in AI model evaluation, data science, computational linguistics or software engineering
• ▹Hands-on experience with Automated Prompt Optimization systems
• ▹Linguistic expertise, including semantics and logic

Soft skills