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

📅 Mar 16
📍 🇪🇸 Spain - Remote🎸 Senior📨 Prompt Engineer📢 🇪🇸 Spanish Required📢 🇬🇧 English Required⚖️ Part-Time
Prompt EngineeringLarge Language Models (llms)Automatic Prompt Generation (apg)Automated Prompt Optimization (apo)
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📜 Description

  • Use Automatic Prompt Generation tools to create baseline prompts for complex template clusters.
  • Run Automated Prompt Optimization, review results, and identify deadlocks or plateaus.
  • Draft, test, and refine prompts for complex templates, anti-patterns, and edge cases.
  • Monitor shadowbot runs and track disagreements between human and LLM ratings.
  • Evaluate autorater quality against gold data and human baselines using F1, precision, and recall.
  • Prepare launch-readiness justifications and certification documentation.

🛠️ Requirements

  • Language Skills: Native fluency in Spanish and fluent in English.
  • Education: Bachelor’s, Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction (HCI), Cognitive Science, or a related analytical field.
  • Prompt Engineering & AI Expertise: At least 4 years' experience as Prompt Engineer. Proven experience tuning Large Language Models (LLMs) for strict, structured outputs, complex classification tasks, and familiarity with chain-of-thought and few-shot learning.
  • Data Analysis: Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools.
  • Technical Agility: Ability to quickly learn and master proprietary tools with minimal supervision.
  • Communication: Excellent verbal and written communication skills.
  • Familiarity with enterprise-grade LLM interfaces like the Goose API.
  • Experience in AI model evaluation, data science, computational linguistics, or software engineering.
  • Hands-on experience with Automated Prompt Optimization (APO) systems or tuning workflows.
  • Linguistic expertise, including an understanding of semantics and logic.
Full job description

 We are seeking a Prompt Engineer to be responsible for the end-to-end technical migration workflow for transitioning templates to LLM autoraters. The role is required to use client’s internal tools to leverage prompt engineering techniques to maximize model performance.

Responsibilities:

  • Utilize Automatic Prompt Generation (APG) tools to create baseline prompts for complex parent-child template clusters.

  • Run and supervise Automated Prompt Optimization (APO) tool, review the outputs, and flag when the APO reaches deadlocks or plateaus.  

  • Manually draft, test, and refine prompts to navigate complex template architectures, overcome anti-patterns, and handle edge cases where tooling is lacking or broken. Solve edge-case scenarios by designing and refining manual prompts.

  • Monitor shadowbot runs to ensure sufficient disagreements (between human and LLM ratings) are registered, generated, and tracked.  

  • Run prompt versions against established gold data to continuously measure autorater quality against the human crowd baseline, calculating accuracy metrics such as F1 scores, precision, and recall.  

  • Draft technical launch readiness justifications (Launch Certification Documentation) for final.

Requirement:

  • Language Skills: Native fluency in Spanish and fluent in English.

  • Location: Must be based in Spain.

  • Education: Bachelor’s, Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction (HCI), Cognitive Science, or a related analytical field. 

  • Prompt Engineering & AI Expertise: At least 4 years' experience as Prompt Engineer. Proven experience tuning Large Language Models (LLMs) for strict, structured outputs, complex classification tasks, and familiarity with chain-of-thought and few-shot learning. 

  • Data Analysis: Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools. 

  • Technical Agility: Ability to quickly learn and master proprietary tools with minimal supervision. 

  • Communication: Excellent verbal and written communication skills. 

Optional / Preferred Skills:

  • Familiarity with enterprise-grade LLM interfaces like the Goose API. 

  • Experience in AI model evaluation, data science, computational linguistics, or software engineering. 

  • Hands-on experience with Automated Prompt Optimization (APO) systems or tuning workflows. 

  • Linguistic expertise, including an understanding of semantics and logic. 

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

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📍 🇳🇱 Netherlands - Remote⚖️ Part-Time🎸 Senior📨 Prompt Engineer📢 🇳🇱 Dutch Required📢 🇬🇧 English Required
Prompt EngineeringLarge Language Models (llms)Automatic Prompt Generation (apg)Automated Prompt Optimization (apo)
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Project Lion - Senior Prompt Engineer - Japan (Remote, Part-Time)

📅 Mar 16
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Own the technical migration of templates to LLM autoraters by generating, optimizing, and refining prompts, monitoring evaluation runs, measuring model quality, and preparing launch-readiness documentation.

📍 🇯🇵 Japan - Remote⚖️ Part-Time🎸 Senior📨 Prompt Engineer📢 🇯🇵 Japanese Required📢 🇬🇧 English Required
Prompt EngineeringLarge Language Models (llms)Automatic Prompt Generation (apg)Automated Prompt Optimization (apo)

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