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, Dev Ops, 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 No

SQL 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, Open Telemetry)

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…