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

3 months, 1 week ago
Germany
Freelance
Senior
Prompt Engineer
Data Science and Analytics
LLM 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 336

Description

  • Use Automatic Prompt Generation (APG) tools to create baseline prompts for complex parent-child template clusters.
  • Run and supervise Automated Prompt Optimization (APO) workflows, review outputs, and identify deadlocks or performance plateaus.
  • Manually draft, test, and refine prompts for complex template architectures and edge cases where tooling is unavailable or broken.
  • Design and refine prompts to solve edge-case scenarios and overcome anti-patterns.
  • Monitor shadowbot runs to ensure sufficient human-versus-LLM rating disagreements are generated and tracked.
  • Run prompt versions against gold data to measure autorater quality against the human crowd baseline.
  • Calculate model quality metrics such as F1 score, precision, and recall.
  • Draft technical launch readiness justifications and Launch Certification Documentation for final approval.
  • Work with proprietary internal tools and adapt quickly to new workflows as needed.

Requirements

  • Native fluency in German and fluent English.
  • Must be based in Germany.
  • 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, experience in AI model evaluation, data science, computational linguistics, or software engineering, hands-on experience with APO systems or tuning workflows, and linguistic expertise in semantics and logic.

Interested in this position?

Apply directly on the company website

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