Principal Software Engineer - Marketplace Platforms

Principal Software Engineer – Marketplace Platforms

640 W California Ave Sunnyvale, CA 94086-4828 R-2387537 $143,000 - $286,000/yr Regular/ Permanent Salaried

Position Summary: 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.

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

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.

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.