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Project Lion - Senior Prompt Engineer - Remote - Part-Time

Welocalize · France · France

Remote Part time Posted Open until 19 Oct 2026
  • Remote Project Lion - Senior Prompt Engineer - Remote - Part-Time — job title

The job, in the employer's words

 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 French and fluent in English. 

    • Location: Must be based in France.

    • 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.  

No Mondays shows this listing as the employer published it. Check the details on the employer's site before you apply.

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