Welo Global

Project Lion - Lead Prompt Engineer - United States (Remote, Part-Time)

USA, United States remote Mid Salary not listed
remote Mid level Technology & IT Curated
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About the role

We are looking for an experienced Lead Prompt Engineer to guide and manage a team through the full technical migration process, transitioning templates to LLM autoraters. In this role, you will leverage advanced prompt engineering techniques and the client’s internal tools to optimize model performance, ensuring the successful integration and ongoing enhancement of AI systems. As the team lead, you will drive the strategy, mentor junior engineers, and play a key role in shaping the future of our AI-driven solutions.

Responsibilities:

Utilize Automatic Prompt Generation (APG) tools to create baseline prompts for complex parent-child template clusters.

Run and supervise Automated Prompt Optimization (APO) tool, review the outputs, and flag when the APO reaches deadlocks or plateaus.  

Manually draft, test, and refine prompts to navigate complex template architectures, overcome anti-patterns, and handle edge cases where tooling is lacking or broken. Solve edge-case scenarios by designing and refining manual prompts.

Monitor shadowbot runs to ensure sufficient disagreements (between human and LLM ratings) are registered, generated, and tracked.  

Run prompt versions against established gold data to continuously measure autorater quality against the human crowd baseline, calculating accuracy metrics such as F1 scores, precision, and recall.  

Draft technical launch readiness justifications (Launch Certification Documentation) for final.

Requirement:

Language Skills: Native fluency in English.

Location: Must be based in United States.

Education: Master’s, or Doctorate degree in Computer Science, Data Science, Computational Linguistics, Human-Computer Interaction (HCI), Cognitive Science, or a related analytical field. 

Prompt Engineering & AI Expertise: At least 7 years' experience as Prompt Engineer. Proven experience tuning Large Language Models (LLMs) for strict, structured outputs, complex classification tasks, and familiarity with chain-of-thought and few-shot learning. 

Data Analysis: Strong proficiency in identifying error patterns, analyzing model performance, and using SQL or other data analytics tools. 

Technical Agility: Ability to quickly learn and master proprietary tools with minimal supervision. 

Communication: Excellent verbal and written communication skills. 

Optional / Preferred Skills: 

Familiarity with enterprise-grade LLM interfaces like the Goose API. 

Experience in AI model evaluation, data science, computational linguistics, or software engineering. 

Hands-on experience with Automated Prompt Optimization (APO) systems or tuning workflows. 

Linguistic expertise, including an understanding of semantics and logic. 

Compensation

Additional Information

Federal Law Compliance 

In compliance with federal law, all persons hired will be required to: 

- Verify identity and eligibility to work in the United States; and 

- Complete a required employment eligibility verification form.

Please note that in order to verify work authorization as is required by Federal law (I-9 process), all new employees must complete a live video verification with their selected IDs and provide photos of these selected IDs within their first 3 days of employment.

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Interview prep

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Mid
Technology & IT API integration Data Analysis MySQL Remote Collaboration SQL Mid level

Likely questions

  1. Tell us about work you have done that is close to the Project Lion - Lead Prompt Engineer - United States (Remote, Part-Time) role.
  2. How would you approach your first 30 days at Welo Global?
  3. Which of API integration, Data Analysis and MySQL have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you stay organised and communicate clearly when working remotely?

Prepare before the call

  • A recent example that proves your experience with API integration, Data Analysis and MySQL.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Project Lion - Lead Prompt Engineer - United States (Remote, Part-Time) role because I can bring practical experience in API integration, Data Analysis and MySQL, learn the team quickly, and contribute to the outcomes Welo Global needs from this hire.

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