Principal Software Engineer – Marketplace Platforms

Position Summary...
What you'll do... Role Overview: We are seeking a Principal Software Engineer to lead the design and development of enterprise-scale Marketplace platforms supporting sellers, listings, pricing, orders, and real-time transactions. This role requires deep expertise in Java, distributed systems, event-driven architectures, Kafka, and Big Data ecosystems, with exposure to AI/ML-driven marketplace intelligence.
About Team: Building the right technology foundation for Infrastructure & platforms is vital to success at the scale of Walmart. Our team builds and maintains the foundational technologies that support the tech organization. Included in this are data platforms, enterprise architecture, DevOps, cloud computing, and infrastructure. All of these products and services are supported by scalable and powerful infrastructure, ensuring a secure and seamless employee and customer experience across stores, digital channels, and distribution centers.
What you'll do:
You will serve as a technical authority responsible for building high-throughput, low-latency systems that power marketplace growth at massive scale.
Architect and build distributed marketplace services for seller onboarding, catalog, pricing, inventory, and order flows
Design event-driven and streaming architectures using Apache Kafka for real-time marketplace signals
Develop and optimize Java-based microservices using Spring / Spring Boot
Build high-volume data pipelines using Big Data frameworks (Spark, Hadoop, Flink) for analytics and ML
Enable AI/ML use cases such as fraud detection, pricing optimization, seller scoring, and recommendations
Lead system design reviews, performance tuning, and scalability planning
Define engineering standards for resiliency, observability, CI/CD, and operational excellence
Mentor senior engineers and influence platform-wide architectural decisions
Partner with product, data science, infrastructure, and security teams
What you'll bring:
Required Qualifications
10+ years of software engineering experience in large-scale systems
Expert proficiency in Java with strong knowledge of concurrency and multithreading
Deep experience building distributed, highly available systems
Hands-on experience with Apache Kafka (topics, partitions, offsets, schema evolution, exactly-once semantics)
Experience with Big Data technologies:
Spark (batch & structured streaming)
Hadoop ecosystem (HDFS, Hive, YARN)
Flink or equivalent stream-processing engines
Strong experience with microservices, REST/gRPC APIs
Proficiency with SQL and NoSQL databases (MySQL, PostgreSQL, Cassandra, MongoDB, etc.)
Strong system design, troubleshooting, and performance-optimization skills
Preferred Qualifications
Marketplace, e-commerce, payments, or supply-chain platform experience
Cloud-native development on AWS, GCP, or Azure
Experience with Kubernetes, Docker, and service mesh
Experience handling millions of sellers, SKUs, and transactions
Familiarity with ML platforms, feature stores, or real-time inference
Experience with observability tools (Prometheus, Grafana, ELK, OpenTelemetry)
Strong understanding of security, data governance, and compliance
What Success Looks Like
Platforms process millions of marketplace events per minute
Systems are fault-tolerant, scalable, and operationally mature
Marketplace data enables real-time insights and AI-driven decisions
Engineering standards align with enterprise-scale best practices
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. We’re a team of software engineers, data scientists, cybersecurity expert's and service professionals within the world’s 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. Walmart’s culture is a competitive advantage, and it’s 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 inclusive 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.
The annual salary range for this position is $143,000.00 - $286,000.00 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 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...
640 W California Avenue, Sunnyvale, CA 94086-4828, United States of America
Walmart 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.