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

Remote; San Francisco (CA); Remote; USD 140,000 - 210,000; Full time

Job summary

Logoslabs is seeking a Prompt Engineer in the United States to own end-to-end template migration for LLM autoraters. You will leverage internal APG/APO tools to maximize model performance and draft refined prompts for complex architectures.

The role requires 4+ years of Prompt Engineering experience, strong SQL/data analytics skills, and excellent communication. Based in the United States, this position emphasizes rigorous testing, leadership in launch readiness, and adherence to policies.

Qualifications

• Bachelor’s, Master’s or Doctorate in Computer Science, Data Science, Computational Linguistics, HCI, Cognitive Science, or related analytical field.
• 4+ years’ experience as Prompt Engineer with LLM tuning for structured outputs.
• Experience with chain-of-thought and few-shot learning.
• Strong SQL or data analytics tool usage.
• Excellent verbal and written communication skills.

Responsibilities

• End-to-end migration workflow for templates to LLM autoraters.
• Utilize APG tools to create baseline prompts for template clusters.
• Run and supervise APO tool, flag deadlocks/plateaus.
• Monitor shadowbot runs and track disagreements.
• Measure autorater quality against gold data with F1, precision, recall.

Skills

Native English

Prompt engineering

LLM tuning

SQL

Data analytics

Communication

Technical agility

Education

Bachelor’s in CS/DS/HCI/CL

Master’s in CS/DS/HCI/CL

PhD in related field

Tools

None

Job description

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.

Requirement:

• 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 4 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.

Federal Law ComplianceIn 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.