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

3 weeks ago
Freelance
Senior
Data Science and Analytics
Welocalize

Welocalize

Welocalize provides translation and localization services to help businesses reach global audiences with precision and efficiency.

Professional Services
1K-5K
Founded 1997
$34M raised

Description

  • Manage the end-to-end technical migration workflow for transitioning templates to LLM autoraters.
  • Use internal tools to create and optimize prompts for complex template structures.
  • Run and supervise automated prompt optimization workflows and identify when they stall or plateau.
  • Manually draft, test, and refine prompts for edge cases, anti-patterns, and broken tooling scenarios.
  • Solve difficult template and prompt edge cases through iterative manual prompt design.
  • Monitor shadowbot runs to ensure disagreements between human and LLM ratings are captured and tracked.
  • Run prompt versions against gold data to measure autorater quality against the human crowd baseline.
  • Calculate evaluation metrics such as F1 score, precision, and recall.
  • Draft technical launch readiness documentation to support final certification decisions.

Requirements

  • Native fluency in Dutch and fluent English.
  • Must be based in the Netherlands.
  • Bachelor’s, Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction, Cognitive Science, or a related analytical field.
  • At least 4 years of experience as a Prompt Engineer.
  • Proven experience tuning LLMs for strict, structured outputs and complex classification tasks.
  • Familiarity with chain-of-thought prompting and few-shot learning.
  • Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools.
  • Ability to quickly learn and master proprietary tools with minimal supervision.
  • Excellent verbal and written communication skills.
  • Preferred: familiarity with enterprise-grade LLM interfaces such as the Goose API.
  • Preferred: experience in AI model evaluation, data science, computational linguistics, or software engineering.
  • Preferred: hands-on experience with Automated Prompt Optimization systems or tuning workflows.
  • Preferred: linguistic expertise, including semantics and logic.

Interested in this position?

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