(USA) Principal, Machine Learning Engineer

Position Summary...The Principal, Machine Learning Engineer will lead the design and development of scalable, production-grade ML systems that address complex business challenges. This role involves architecting end-to-end ML pipelines, driving innovation in advanced modeling techniques, and ensuring robust deployment and monitoring practices. The position requires collaboration with cross-functional teams to align ML solutions with strategic objectives while mentoring technical staff and promoting engineering excellence. The successful candidate will apply sound technical judgment, foster continuous improvement, and contribute to Walmart’s reputation through thought leadership and technical communication.
About the team:
The Personalization team at Walmart is committed to enhancing customer experiences by delivering seamless, tailored journeys across all engagement channels. Operating at the nexus of vast product assortments, millions of customers, and thousands of stores, the team develops advanced AI-driven solutions that empower both customers and associates. Comprising data scientists, engineers, and product experts, the team designs and builds innovative machine learning models and systems using cutting-edge techniques such as deep learning, reinforcement learning, and natural language processing. Their work shapes the future of e-commerce by enabling personalized, efficient, and trusted interactions.

What you'll do...

• Architect and lead the development of scalable, production-grade ML systems powering customer-facing personalization and recommendation experiences.
• Own technical direction across the end-to-end ML lifecycle, including data and feature pipelines, model training, evaluation, deployment, serving, monitoring, and continuous improvement.
• Design high-performance batch and real-time ML architectures capable of operating reliably at large scale.
• Partner with Data Scientists and other ML practitioners to translate model prototypes and experimentation into scalable, maintainable production systems.
• Establish engineering patterns and best practices for model deployment, feature management, reproducibility, automated testing, observability, retraining, and model lifecycle management.
• Develop and optimize ML solutions using techniques such as recommendation and ranking, deep learning, representation learning, NLP, and other advanced machine learning approaches.
• Design systems that balance model quality with production requirements such as latency, throughput, scalability, reliability, maintainability, and cost.
• Build reusable ML capabilities, services, and infrastructure that accelerate development and adoption across teams.
• Define technical strategies and architecture for complex and ambiguous ML problems and influence engineering decisions across multiple teams.
• Partner cross-functionally with ML, Software Engineering, Data Science, Product, and Platform teams to align ML capabilities with customer and business objectives.
• Mentor senior technical talent, raise engineering standards, and provide technical leadership across the broader ML engineering community.

What You'll Bring

• Extensive experience designing, building, deploying, and operating large-scale machine learning systems in production.
• Strong software engineering fundamentals and proficiency in Python and production software development practices.
• Deep understanding of the end-to-end ML lifecycle, including data preparation, feature engineering, model development, training, evaluation, deployment, inference, monitoring, and retraining.
• Experience building production ML systems using frameworks such as PyTorch, TensorFlow, Scikit-learn, XGBoost, or comparable technologies.
• Expertise in one or more relevant ML domains such as recommendation and ranking, deep learning, representation learning, NLP, reinforcement learning, or related advanced ML techniques.
• Experience designing scalable batch and/or real-time model training, inference, and feature-serving architectures.
• Strong understanding of distributed systems, APIs and services, cloud-native architectures, and scalable data processing.
• Experience with production ML engineering practices including automated pipelines, CI/CD, model and data versioning, testing, observability, model performance monitoring, and drift detection.
• Experience designing ML systems for performance, reliability, scalability, latency, and cost efficiency.
• Experience building and deploying production ML systems on cloud platforms such as GCP, Azure, or comparable environments, including scalable training, inference, and ML pipelines.
• Demonstrated ability to establish technical direction, influence architecture across teams, and drive complex initiatives from concept through production.
• Proven ability to mentor engineers, establish engineering best practices, and raise technical standards across an organization.
• Strong technical communication skills with the ability to communicate complex ML and engineering concepts clearly to technical and non-technical stakeholders.

At Walmart, we offer competitive pay as well as performance-based bonus awards and other great benefits for a happier mind, body, and wallet. Health benefits include medical, vision and dental coverage. Financial benefits include 401(k), stock purchase and company-paid life insurance. Paid time off benefits include PTO (including sick leave), parental leave, family care leave, bereavement, jury duty, and voting. Other benefits include short-term and long-term disability, company discounts, Military Leave Pay, adoption and surrogacy expense reimbursement, and more. You will also receive PTO and/or PPTO that can be used for vacation, sick leave, holidays, or other purposes. The amount you receive depends on your job classification and length of employment. It will meet or exceed the requirements of paid sick leave laws, where applicable. For information about PTO, see https://one.walmart.com/notices. Live Better U is a Walmart-paid education benefit program for full-time and part-time associates in Walmart and Sam's Club facilities. Programs range from high school completion to bachelor's degrees, including English Language Learning and short-form certificates. Tuition, books, and fees are completely paid for by Walmart.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to a specific plan or program terms.
For information about benefits and eligibility, see One.Walmart.
Sunnyvale, California US-11349: The annual salary range for this position is $169,000.00 - $338,000.00
Bellevue, Washington US-11663: The annual salary range for this position is $156,000.00 - $312,000.00 Additional compensation includes annual or quarterly performance bonuses. Additional compensation for certain positions may also include :
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Minimum Qualifications...

Outlined below are the required minimum qualifications for this position. If none are listed, there are no minimum qualifications.

Option 1: Bachelor's degree in computer science, computer engineering, computer information systems, software engineering, or related area and 5 years’ experience in software engineering, machine learning engineering, AI systems or related area.
Option 2: 7 years’ experience in software engineering, machine learning engineering, AI systems or related area.
2 years’ supervisory experience.

Preferred Qualifications...

Outlined below are the optional preferred qualifications for this position. If none are listed, there are no preferred qualifications.

Master’s degree in computer science, computer engineering, computer information systems, software engineering, or related area and 3 years' experience in software engineering, machine learning engineering, AI systems or related area., Prior work experience in accessibility best practices., Prior work experience in creating inclusive digital experiences, demonstrating knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly.

Primary Location...

1395 Crossman Ave, Sunnyvale, CA 94089-1114, United States of AmericaWalmart and its subsidiaries are committed to maintaining a drug-free workplace and has a no tolerance policy regarding the use of illegal drugs and alcohol on the job. This policy applies to all employees and aims to create a safe and productive work environment.