Project Lion - Senior Prompt Engineer - United States (Remote, Part-Time)
Posted 13 days ago|Apply before June 18, 2026
About the position
We are seeking a Prompt Engineer to be responsible for the end-to-end technical migration workflow for transitioning templates to LLM autoraters. The role is required to use client's internal tools to leverage prompt engineering techniques to maximize model performance.
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.
Requirements
- Language Skills: Native fluency in English.
- Location: Must be based in United States.
- Education: Bachelor's, 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 2 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.
Nice-to-haves
- 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.
Benefits
- Employee Assistance Program
- Paid Sick Time
- Medical Insurance
- Dental Insurance
- Vision Insurance
- HSA
- Voluntary Life Insurance
- Accident, Critical Illness, Hospital Indemnity Insurance
- 401(k) Retirement Plan
- Verify identity and eligibility to work in the United States
- Complete a required employment eligibility verification form
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