# Project Lion - Senior Prompt Engineer - France (Remote, Part-Time) Source: https://realanalystjobs.com/job/project-lion-senior-prompt-engineer-france-remote-part-time-welo-global-719788f1 Project Lion - Senior Prompt Engineer - France (Remote, Part-Time) at Welo Global, an on-site role based in France. Experience level: 4 Years. Posted on 16 March 2026, read from Welo Global's own careers page (Lever), which RealAnalystJobs re-checks daily and removes the role when it closes. Updated 15 November 2026. ## Key facts - Company: [Welo Global](https://realanalystjobs.com/companies/welo-global) - Location: France - Work mode: On-site - Posted: Mar 16, 2026 - Employment type: Part time - Experience level: 4 Years - Source: Welo Global's careers page (Lever), re-checked daily Skills: [SQL](https://realanalystjobs.com/skills/sql) ## About this role 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. Description from Welo Global's public careers feed, reproduced so you can read the role here. Apply on the company's own site; Real Analyst Jobs never submits anything for you. ## How to apply Open [this role on Real Analyst Jobs](https://realanalystjobs.com/job/project-lion-senior-prompt-engineer-france-remote-part-time-welo-global-719788f1) and use Apply now there to reach the employer's application. The listing is re-checked against Welo Global's careers page daily and removed when it closes. ## Welo Global 23 open analyst roles on Real Analyst Jobs. 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