Principal, Software Engineer

Position Summary...

Want to build the measurement backbone of a multi-billion-dollar advertising business — at Walmart scale? We're looking for a seasoned technical leader to lead 10+ engineers in designing and delivering a next-generation suite of measurement solutions from 0 to 1, spanning incrementality, attribution, data cleanroom measurement, partner integrations, and GenAI-powered reporting. You'll define technical direction, conduct design reviews, and partner with data scientists, ML engineers, and product managers to solve world-class AdTech problems using ML, statistical methods, and cutting-edge GenAI techniques — all while ensuring the absolute stability and correctness that our business demands. The ideal candidate brings 5+ years of experience in ML and data-intensive platform development, 2+ years as a staff-level technical lead, and deep familiarity with distributed systems (Spark, Flink, Kafka, BigQuery, and beyond). Experience in AdTech measurement, real-time streaming, and emerging GenAI patterns (RAG, agents, MCP, fine-tuning) will set you apart — and if you happen to have a PhD, publications, or patents, even better. If you're energized by high-impact, high-scale problems and want to shape the future of advertising measurement alongside a team of talented engineers with doctoral degrees and top-tier industry experience, we'd love to hear from you.

What you'll do...

• Be the technical leader of 10+ engineers.
• Solve world class scale AdTech problems using ML and statistical methods together with a group talented engineers with doctoral degrees and industry experience in top-tier tech companies.
• Lead platform development for a suite of measurement solutions from 0 to 1— including incrementality, attribution, data cleanroom measurement, partner integrations, and GenAI-powered reporting — supporting both real-time optimization and offline reporting with the absolute stability and correctness demanded by Walmart's multi-billion-dollar digital advertising business.
• Define technical direction and conduct design reviews for engineering teams while partnering with engineering leadership and cross-functional stakeholders to align technical strategy with business goals.
• Troubleshoot business and production issues by gathering information (issue, impact, criticality, possible root cause), engage support teams to assist in resolution of issues, formulate an action plan, performing actions as designated in plan, interpret the results to determine further action, and complete online documentation.

What you'll bring:

• 5+ years of experience in ML and data intensive platform development.
• 2+ years of experience as staff+ level technical lead.
• Familiar with distributed data processing tools and databases, e.g., Spark streaming, Flink, Kafka, RAY, BigQuery, Druid, Casandra, etc.
• Skilled at leveraging AI to enhance productivity and drive innovation.
• Familiar with GenAI skills and techniques e.g., MCP, RAG, Re-ranking, Agent Skill, Progressive disclosure, Context engineering, Agent-to-agent protocol, fine-tuning, etc.
• Familiar with prevailing ML libraries e.g., pyspark, pytorch, etc.
• Experience implementing statistical and machine learning methods for data classification, regression, ranking, and/or recommendation.
• Experience working cross-functionally with data scientists, machine learning engineers, and product managers.
• Experience working in AdTech with demonstrated knowledge of the AdTech business.
• PhD in data mining, data management, machine learning, operation research, GenAI, or statistics is a plus.
• Publications in top-tier academic conferences or journals is a plus.
• Experience with ad-tech targeting, measurement, identity mapping, bidding, and optimization related domains is a plus.
• Extensive experience with real-time data streaming applications is a plus.
• Patents in data or machine learning related domains is a plus.
• Having foundation knowledge in LLM (e.g., LoRA, transformer) is a plus.
• A good understanding of query optimization and distributed systems is a plus.
• A good understanding of industry trends in AdTech, ML, and GenAI is a plus.

About Walmart Global Tech
Imagine working in an environment where one line of code can make life easier for hundreds of millions of people. That's what we do at Walmart Global Tech. Were a team of software engineers, data scientists, cybersecurity experts and service professionals within the worlds leading retailer who make an epic impact and are at the forefront of the next retail disruption. People are why we innovate, and people power our innovations. We are people-led and tech-empowered. We train our team in the skillsets of the future and bring in experts like you to help us grow. We have roles for those chasing their first opportunity as well as those looking for the opportunity that will define their career. Here, you can kickstart a great career in tech, gain new skills and experience for virtually every industry, or leverage your expertise to innovate at scale, impact millions and reimagine the future of retail.

Walmarts culture is a competitive advantage, and its fostered by being together. Working together in person allows us to collaborate, align quickly and innovate with greater speed. We use our campuses to create purposeful connection rooted in deepening understanding and investing in the development of our associates. 

Our hubs: Walmart is a global company with offices across the United States and around the world. Our global headquarters is in Bentonville, Arkansas, with primary hubs in the San Francisco Bay area and New York/New Jersey.

Benefits:
Benefits: Beyond our great compensation package, you can receive incentive awards for your performance. Other great perks include 401(k) match, stock purchase plan, paid maternity and parental leave, PTO, multiple health plans, and much more.

Equal Opportunity Employer:
Walmart, Inc. is an Equal Opportunity Employer By Choice. We believe we are best equipped to help our associates, customers and the communities we serve live better when we really know them. That means understanding, respecting, and valuing unique styles, experiences, identities, ideas and opinions while being welcoming of all people.

The above information has been designed to indicate the general nature and level of work performed in the role. It is not designed to contain or be interpreted as a comprehensive inventory of all responsibilities and qualifications required of employees assigned to this job. The full Job Description can be made available as part of the hiring process.
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-11657: The annual salary range for this position is $143,000.00 - $286,000.00

Hoboken, New Jersey US-10279: The annual salary range for this position is $132,000.00 - $264,000.00
Additional compensation includes annual or quarterly performance bonuses.
Additional compensation for certain positions may also include :
- Stock

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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 or related area.
Option 2: 7 years’ experience in software engineering or related area.

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 or related area., We value candidates with a background 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. The ideal candidate would have knowledge of accessibility best practices and join us as we continue to create accessible products and services following Walmart’s accessibility standards and guidelines for supporting an inclusive culture.

Primary Location...

1345 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.

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