Dutch Senior Prompt Engineer: LLM Migration & Optimization

Welo Data is seeking a highly technical Senior Prompt Engineer based in the Netherlands to lead the end-to-end migration of templates into high-performance LLM autoraters.

## The Mission: Automated Quality at Scale

Architectural Migration: Take full ownership of the end-to-end technical migration of templates to LLM autoraters.

Optimization Leadership: Utilize Automatic Prompt Generation (APG) and supervise Automated Prompt Optimization (APO) tools to push model performance past plateaus and logic deadlocks.

Metrics-Driven Excellence: Continuously measure quality against "gold data" baselines, tracking precision, recall, and F1 scores to justify launch readiness.

Edge-Case Engineering: Manually draft and refine complex prompts to overcome anti-patterns and architecture gaps that automated tools cannot solve.

## Requirements

• Educational Foundation: Bachelor's, Master's, or PhD in Computer Science, Data Science, Computational Linguistics, or a related analytical field
• Prompt Engineering Mastery: 4+ years of experience tuning LLMs for strict, structured outputs, complex classification, and few-shot learning
• Analytical Power: High proficiency in identifying error patterns and using SQL or data analytics tools to monitor performance
• Technical Agility: Fast learner capable of mastering proprietary internal tools and "Goose API" style interfaces with minimal oversight
• Native fluency in Dutch and professional fluency in English
• Must be currently based in the Netherlands

## Preferred Skills

• Familiarity with shadowbot monitoring and disagreement tracking between human and LLM ratings
• Hands-on experience with Chain-of-Thought (CoT) prompting and APO systems
• Deep linguistic expertise, including a strong understanding of semantics and formal logic
• Proven ability to draft high-level Launch Certification Documentation