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

3 months, 1 week ago
Japan
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 plateaus.
  • Manually draft, test, and refine prompts for complex template architectures and edge cases where tooling is insufficient.
  • Design and refine manual prompts to solve difficult edge-case scenarios.
  • Monitor shadowbot runs to ensure disagreements between human and LLM ratings are generated 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 launch readiness justifications and certification documentation for release approval.
  • Use client internal tools to support the end-to-end technical migration workflow.

Requirements

  • Native fluency in Japanese and fluent English.
  • Must be based in Japan.
  • Bachelor’s, Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, HCI, Cognitive Science, or a related analytical field.
  • At least 4 years of experience as a Prompt Engineer.
  • Experience tuning LLMs for strict, structured outputs and complex classification tasks.
  • Familiarity with chain-of-thought and few-shot learning approaches.
  • Strong ability to identify error patterns, analyze model performance, and use 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, AI model evaluation, data science, computational linguistics, or software engineering experience, hands-on experience with APO systems or tuning workflows, and linguistic expertise including semantics and logic.

Interested in this position?

Apply directly on the company website

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