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

23 hours, 41 minutes ago
Part-time
Senior
Software Development
Welo Global

Welo Global

Welo Global specializes in providing enterprise localization, AI training data, and multilingual content solutions, leveraging a portfolio of specialized global brands to meet diverse customer needs in the AI and language services industry.

Professional Services
Founded 1997

Description

  • Create baseline prompts for complex parent-child template clusters using Automatic Prompt Generation (APG) tools.
  • Run and oversee Automated Prompt Optimization (APO), reviewing outputs and identifying deadlocks or performance plateaus.
  • Manually draft, test, and refine prompts for complex architectures, anti-patterns, and edge cases where tooling is insufficient.
  • Monitor shadowbot runs to ensure human-versus-LLM rating disagreements are generated and tracked.
  • Evaluate prompt versions against gold data and human-crowd baselines using F1, precision, and recall metrics.
  • Prepare technical launch-readiness justifications and launch certification documentation.

Requirements

  • Native Portuguese fluency and fluent English proficiency.
  • Must be based in Portugal.
  • 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 prompting and few-shot learning.
  • Proficiency in identifying error patterns, analyzing model performance, and using SQL or similar analytics tools.
  • Ability to quickly learn and use proprietary tools with minimal supervision.
  • Excellent written and verbal communication skills.
  • Familiarity with enterprise LLM interfaces such as Goose API, APO workflows, AI model evaluation, data science, computational linguistics, software engineering, or semantics and logic is preferred.

Interested in this position?

Apply directly on the company website

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