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

3 weeks ago
Netherlands
Freelance
Senior
Prompt Engineer
Data Science and Analytics
SQL
Apply Now
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
View All Jobs 378

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?

Apply directly on the company website

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