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

Freelance · onsite · Posted 15 Jun 2026

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01

What you will do

About this role

We are seeking a Prompt Engineer responsible for the end-to-end technical migration workflow for transitioning templates to LLM autoraters. The role requires the use of the 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 outputs, and flag when APO stagnates or reaches a plateau.
  • Manually draft, test, and refine prompts to navigate complex template architectures, overcome anti-patterns, and address edge cases where tooling is insufficient 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 approval.

Skills & experience

SeniorPrompt EngineeringLarge Language Models (LLMs)Automatic Prompt Generation (APG)Automated Prompt Optimization (APO)Chain-of-thought learningFew-shot learningSQLData analysisModel evaluationGoose API
02

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