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Senior Prompt Engineer

Welocalize· Welo Data - AI Services
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Hybrid (Spain)Freelance / Part-TimePosted 7mo ago

About the role

Seeking a Prompt Engineer responsible for the technical migration workflow, prompt engineering techniques, and model performance optimization using client’s internal tools.

Responsibilities

  • Utilize Automatic Prompt Generation (APG) tools to create baseline prompts for complex template clusters.
  • Run and supervise Automated Prompt Optimization (APO) tool, review outputs, and flag issues.
  • Manually draft, test, and refine prompts for complex templates, anti-patterns, and edge cases.
  • Monitor shadowbot runs to ensure disagreements are registered and tracked.
  • Run prompt versions against gold data to measure autorater quality, calculating accuracy metrics such as F1 scores, precision, and recall.
  • Draft technical launch readiness justifications, including Launch Certification Documentation.

Qualifications

  • Native fluency in Spanish and fluent in English.
  • Must be based in Spain.
  • Bachelor’s, Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction (HCI), Cognitive Science, or related fields.
  • At least 4 years' experience as Prompt Engineer with proven experience tuning Large Language Models (LLMs).
  • Strong proficiency in data analysis, error pattern identification, and model performance analysis using SQL or similar tools.
  • Ability to quickly learn and master proprietary tools with minimal supervision.
  • Excellent verbal and written communication skills.

Skills

Required:Prompt EngineeringData AnalysisEnglish FluencySpanish Fluency
Last updated Apr 1, 2026. Interested? Apply on the company site.

About Welocalize

Bridging language & AI to power global success.

Bridging language & AI to power global success. Our expertise in localization & AI data ensures scalable solutions for businesses worldwide.

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