Dutch Senior Prompt Engineer: LLM Migration & Optimization

## Senior Prompt Engineer - LLM Architecture Migration

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

This is a specialized role for a technical architect who understands that "perfecting a prompt" is a rigorous engineering discipline. You will leverage advanced APG/APO tools and manual refinement to ensure our automated systems meet—and exceed—human accuracy baselines in both German and English contexts.

### 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.

Language Requirements: Native fluency in Dutch and professional fluency in English.