AI Prompt Engineer-Voice Agents (Local Hero)

Local Hero Holdings Company•Boulder, CO

3d•$100,000 - $120,000•Remote

About The Position

We are seeking a Prompt Engineer to design, test, and optimize prompts for our next-generation Voice AI agents. This role sits at the intersection of conversational design, AI, and real-time call operations. You will work closely with our Manager of Performance Call Systems to translate proven human conversation strategies into high-performing AI prompts that drive better caller experience, higher engagement, and improved conversion outcomes. This is a highly impactful role where your work will directly influence how thousands of real-time conversations are handled daily. If you are looking to work in a fun start-up culture where you can take your skills to the next level, keep on reading! This position is remote (hybrid available if within commuting distance to Boulder, CO) and open to candidates living in the following locations: Colorado, Florida, Illinois, New Hampshire, New York, North Carolina, Ohio, Texas, Utah, Virginia, Washington DC, and Puerto Rico Relocation assistance is not provided. Do not apply if you do not reside in one of the above locations unless you are already planning to relocate at your own and share those details in a cover letter.

Requirements

2+ years experience in an AI Engineering role working with LLMs / AI systems (e.g., GPT-based models, voice AI platforms, or similar)
A minimum of 1 year experience in prompt engineering with voice AI platforms (Ultravox, Twilio, VAPI, etc.)
Bachelor’s degree (minimum) in a related field of study
Excellent written communication skills with strong attention to tone, clarity, and intent
Strong ability to translate business requirements into structured logic or instructions
Experience with conversation design, scripting, or chatbot/voice agent development
Analytical mindset with the ability to interpret data and iterate quickly
Highly analytical, systems-oriented thinker
Comfortable working closely with product, data, and engineering teams

Nice To Haves

Background in call center operations, sales scripting, or lead generation
Familiarity with A/B testing frameworksand experimentation
Basic understanding of APIs, JSON structures, or prompt templating systems
Experience working with transcript analysis or conversational analytics

Responsibilities

Prompt Design & Development
Translate call scripts, business rules, and conversational strategies into structured prompts for voice AI agents
Design prompts that guide natural, human-like conversations while maintaining control, compliance, and business objectives
Collaboration with Manager of Performance Call Systems
Partner with Manager of Performance Call Systems to understand intent, tone, objection handling, and conversion tactics
Convert qualitative guidance into precise, testable prompt logic
Testing & Iteration
Continuously test prompts in real-world call scenarios
Analyze call transcripts, outcomes, and performance metrics to refine prompts
Iterate quickly to improve performance (e.g., connection rates, transfer rates, call duration, caller satisfaction)
Conversation Optimization
Improve how agents:
Ask qualifying questions
Handle objections
Transition between conversation stages
Manage edge cases and unexpected responses
Cross-Functional Collaboration with Product & Engineering
Identify limitations where desired agent behavior cannot be achieved through prompt design alone
Work closely with Product and Engineering teams to:
Define requirements for system-level enhancements (e.g., memory, state handling, integrations, orchestration logic)
Improve agent capabilities beyond prompt-layer control
Ensure alignment between prompt logic and underlying platform behavior
Act as a key stakeholder in shaping the evolution of the voice AI platform based on real-world conversational gaps
Documentation & Prompt Frameworks
Maintain clear documentation of prompt structures, patterns, and best practices
Help build a scalable prompt library for different use cases, verticals, and states

Benefits

Remote work available with the possibility of onsite or hybrid if in commuting distance of our Boulder, CO office
Time off is as important as hard work! Salaried employees are on a Flex PTO plan
Generous holidays including a reduced schedule between Christmas and New Year’s
We make sure our team is well cared for with strong health plans - We even cover our employees' dental and vision premiums
Access to Flexible Spending Accounts Plan
Matching traditional and Roth 401k
Employee Assistance Program
Supplemental tenure-based leave: self-care and family first
Life Insurance
Legal Assistance plan
Pet Insurance discount through the ASPCA
A killer culture with team members who have your back!
In-person and virtual connection points for culture building and team members who have your back!
Compensation: $100,000-$120,000 DOE