Principal Software Engineer - Marketplace Platforms

Reference: R-2387537Posted: 2026-01-07Location: SUNNYVALE, CA, United StatesSalary: $143000 - $286000/yearType: Regular/PermanentCompany: WalmartRole 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 flowsDesign event-driven and streaming architectures using Apache Kafka for real-time marketplace signalsDevelop and optimize Java-based microservices using Spring / Spring BootBuild high-volume data pipelines using Big Data frameworks (Spark, Hadoop, Flink) for analytics and MLEnable AI/ML use cases such as fraud detection, pricing optimization, seller scoring, and recommendationsLead system design reviews, performance tuning, and scalability planningDefine engineering standards for resiliency, observability, CI/CD, and operational excellenceMentor senior engineers and influence platform-wide architectural decisionsPartner with product, data science, infrastructure, and security teamsWhat you'll bring:Required Qualifications10+ years of software engineering experience in large-scale systemsExpert proficiency in Java with strong knowledge of concurrency and multithreadingDeep experience building distributed, highly available systemsHands-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 enginesStrong experience with microservices, REST/gRPC APIsProficiency with SQL and NoSQL databases (MySQL, PostgreSQL, Cassandra, MongoDB, etc.)Strong system design, troubleshooting, and performance-optimization skillsPreferred QualificationsMarketplace, e-commerce, payments, or supply-chain platform experienceCloud-native development on AWS, GCP, or AzureExperience with Kubernetes, Docker, and service meshExperience handling millions of sellers, SKUs, and transactionsFamiliarity with ML platforms, feature stores, or real-time inferenceExperience with observability tools (Prometheus, Grafana, ELK, OpenTelemetry)Strong understanding of security, data governance, and complianceWhat Success Looks LikePlatforms process millions of marketplace events per minuteSystems are fault-tolerant, scalable, and operationally matureMarketplace data enables real-time insights and AI-driven decisionsEngineering standards align with enterprise-scale best practicesAbout Walmart Global TechImagine 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 . 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 : - StockMinimum 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["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."]Additional information(empty)