Principal AI Engineer Job at Mastercard (Arlington)

Principal AI Engineer

Mastercard

Location:
United States of America , Arlington

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

179000.00 - 305000.00 USD / Year

Save Job

Apply Position

Job Description:

At Mastercard, we are building the next generation of AI-powered platforms that drive innovation, efficiency, and impact. As a Senior AI Engineer, you will work hands-on with cutting-edge AI tools, large language models (LLMs), and emerging frameworks to develop intelligent systems that power our platform. You’ll collaborate closely with senior engineers, data scientists, and product teams—learning from experts while contributing to real-world AI applications. You will be responsible for implementing Agentic AI systems, developing backend services to support them, and experimenting with new AI capabilities. You will also focus on prompt engineering, guardrail design, and running experiments to ensure safe, effective, and scalable AI solutions.

Job Responsibility:

Agentic AI Development – Build and enhance AI agents and backend systems that power Mastercard’s AI platform
Experimentation & Evaluation – Test and evaluate new LLMs, emerging AI technologies, and frameworks to identify opportunities for innovation
Prompt Engineering – Design, refine, and optimize prompts for LLMs to achieve desired outputs
Guardrail Development – Implement safeguards to ensure AI responses are accurate, secure, and aligned with ethical guidelines
Backend Engineering – Contribute to the development of APIs, microservices, and data integrations for AI-powered features
Best Practices in Software Development – Write clean, maintainable, and well-documented code following industry standards
Continuous Learning – Stay current with the latest developments in AI, LLMs, and software engineering best practices

Requirements:

Strong hands-on experience with AI/ML concepts, with a passion for working with LLMs and generative AI
Professional hands-on experience with Python and backend development frameworks (e.g., FastAPI, Flask, Node.js)
Understanding of REST APIs and cloud environments (AWS, Azure, or GCP)
Strong problem-solving and analytical skills, with curiosity for exploring new AI capabilities
Comfortable working in a collaborative environment and open to feedback and mentorship
Eagerness to learn prompt engineering, AI safety/guardrail development, and large-scale AI deployment

What we offer:

insurance (including medical, prescription drug, dental, vision, disability, life insurance)
flexible spending account and health savings account
paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave)
80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire
10 annual paid U.S. observed holidays
401k with a best-in-class company match
deferred compensation for eligible roles
fitness reimbursement or on-site fitness facilities
eligibility for tuition reimbursement

Additional Information:

Job Posted:
January 02, 2026

Employment Type:

Fulltime

Mastercard - All Job Offers

Job Link Share:

Looking for more opportunities? Search for other job offers that match your skills and interests.

Welcome to CrawlJobs.com –
Your Global Job Discovery Platform

At CrawlJobs.com, we simplify finding your next career opportunity by bringing job listings directly to you from all corners of the web. Using cutting-edge AI and web-crawling technologies, we gather and curate job offers from various sources across the globe, ensuring you have access to the most up-to-date job listings in one place.