Principal Software Engineer - Real-Time Marketplace Scale

Walmart; Sunnyvale (CA); On-site; USD 143,000 - 286,000; Full time

Benefits offered by this job

Stock

Annual/quarterly bonuses

Tuition/Live Better U

Employee discount card

Job summary

Walmart Global Tech in Sunnyvale, CA seeks a Principal Software Engineer to lead design and development of enterprise-scale Marketplace platforms powering sellers, listings, pricing, orders, and real-time transactions.

You will architect high-throughput, low-latency systems, guide microservices in Java with Spring Boot, and implement Kafka-based event streams, big data pipelines, and AI/ML-driven insights at scale.

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.).

Responsibilities

• 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 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

Skills

Java

Distributed systems

Kafka

Big Data

Microservices

REST/gRPC APIs

SQL/NoSQL

Tools

Spring / Spring Boot

Spark

Hadoop

Flink

Job description

Walmart Global Tech in Sunnyvale, CA seeks a Principal Software Engineer to lead design and development of enterprise-scale Marketplace platforms powering sellers, listings, pricing, orders, and real-time transactions.

You will architect high-throughput, low-latency systems, guide microservices in Java with Spring Boot, and implement Kafka-based event streams, big data pipelines, and AI/ML-driven insights at scale.