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

3 months, 1 week ago
Spain
Freelance
Senior
Prompt Engineer
Data Science and Analytics
LLM SQL
Apply Now
Welocalize

Welocalize

Welocalize provides translation and localization services to help businesses reach global audiences with precision and efficiency.

Professional Services
1K-5K
Founded 1997
$34M raised
View All Jobs 336

Description

  • Create baseline prompts for complex parent-child template clusters using Automatic Prompt Generation (APG) tools.
  • Run and supervise Automated Prompt Optimization (APO) workflows, review outputs, and identify deadlocks or plateaus.
  • Manually draft, test, and refine prompts for complex template architectures, anti-patterns, and edge cases.
  • Design and refine manual prompts to solve scenarios where tooling is lacking or broken.
  • Monitor shadowbot runs to ensure disagreements between human and LLM ratings are generated and tracked.
  • Run prompt versions against gold data to measure autorater quality against the human crowd baseline.
  • Calculate evaluation metrics such as F1 score, precision, and recall.
  • Draft launch readiness and certification documentation for final technical release decisions.

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, Human-Computer Interaction, Cognitive Science, or a related analytical field.
  • At least 4 years of experience as a Prompt Engineer.
  • Proven experience tuning LLMs for strict, structured outputs and complex classification tasks.
  • Familiarity with chain-of-thought prompting and few-shot learning.
  • Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools.
  • Ability to quickly learn and master proprietary tools with minimal supervision.
  • Excellent verbal and written communication skills.
  • Preferred: 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 APO systems or tuning workflows, and linguistic expertise in semantics and logic.

Interested in this position?

Apply directly on the company website

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