Role description

AI/ML Engineer

ML Engineer II

UST is searching for an AI/ML Engineer to design and develop an intelligent chatbot AI Agent that empowers merchants to analyze sales performance and make data-driven decisions.

The opportunity:
• Architect, develop, and deploy a chatbot AI Agent to support merchants in analyzing sales performance and decision-making.
• Apply prompt engineering techniques to improve query handling, ensure accurate responses, and optimize LLM interactions.
• Build AI agent workflows leveraging LangChain, LangGraph, and FastMCP for tool integration and orchestration.
• Integrate MCP tools for dynamic data access, retrieval, and analysis.
• Fine-tune and optimize LLMs to handle merchant-specific queries with precision and efficiency.
• Design and implement testing strategies for AI Agents and LLM-based workflows, including evaluation of accuracy, reliability, and bias.
• Build APIs and microservices (using FastAPI) to support chatbot functionality and data pipelines.
• Deploy scalable solutions with Docker and Kubernetes, ensuring reliability and performance.
• Collaborate with product managers, data scientists, and business stakeholders to align AI solutions with merchant needs.

This position description identifies the responsibilities and tasks typically associated with the performance of the position. Other relevant essential functions may be required.

What you need:
• Hands-on experience with LLMs, AI Agents, Chatbots, and prompt engineering.
• Strong understanding of testing and evaluation methods for LLM-powered agents, including prompt validation, output reliability, and user feedback loops.
• Proficiency in LangChain and LangGraph for agentic workflows and orchestration. Familiarity with FastMCP and MCP (Model Context Protocol) for tool integration.
• Proficiency in Python for AI/ML development.
• Experience building services with FastAPI.
• Proficiency with Docker and Kubernetes for scalable deployments.
• Strong problem-solving and communication skills to bridge technical solutions with merchant use cases.
• Ability to adapt quickly, learn complex systems, and contribute effectively in a fast-paced environment.
• FastAPI, LangGraph, LangChain, Python
• Bachelor's Degree in computer science or equivalent experience

Compensation can differ depending on factors including but not limited to the specific office location, role, skill set, education, and level of experience. UST provides a reasonable range of compensation for roles that may be hired in various U.S. markets as set forth below.

Role Location: Arkansas

Compensation Range: $82,000-$123,000

Benefits

Full-time, regular employees accrue a minimum of 10 days of paid vacation per year, receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year), 10 paid holidays, and are eligible for paid bereavement leave and jury duty. They are eligible to participate in the Company's 401(k) Retirement Plan with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance, as well as the following Company-paid Employee Only benefits: basic life insurance, accidental death and disability insurance, and short- and long-term disability benefits. Regular employees may purchase additional voluntary short-term disability benefits, and participate in a Health Savings Account (HSA) as well as a Flexible Spending Account (FSA) for healthcare, dependent child care, and/or commuting expenses as allowable under IRS guidelines. Benefits offerings vary in Puerto Rico.

Part-time employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company's 401(k) Retirement Plan with employer matching.

Full-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company's 401(k) program with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance.

Part-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year).

All US employees who work in a state or locality with more generous paid sick leave benefits than specified here will receive the benefit of those sick leave laws.

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