# Project Lion - Senior Prompt Engineer - France (Remote, Part-Time) at Welo Global

Project Lion - Senior Prompt Engineer - France (Remote, Part-Time) at Welo Global in France. Remote, contract. Posted March 16, 2026.

- Company: Welo Global
- Location: France
- Workplace: Remote
- Job type: Contract
- Posted: 2026-03-16
- Apply: https://jobs.lever.co/weloglobal/bd62b741-47cc-4363-9bb5-170253f53187/apply
- Source: https://jobmagic.ai/jobs/project-lion-senior-prompt-engineer-france-remote-part-time-welo-global-pnjh92

## 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 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.