Senior, Software Engineer (Fullstack, Backend Heavy)

Position Summary...

What you'll do...

Senior Software Engineer – ModFlex, Locations & Digital Shelf Labels

Walmart Global Tech | Store Systems & Infrastructure
 

About the Team

The ModFlex, Locations & Digital Shelf Labels team builds and maintains the core systems that power real-time store operations at Walmart scale. We are the Single Source of Truth (SSOT) for merchandise locations — managing over 600 million merchandise location records across thousands of Walmart stores. As Digital Shelf Labels (DSL) expands to Sam’s Club and beyond, we’re scaling to support a comparable footprint of electronically labeled items across the entire chain. Our platforms are mission-critical — downstream consumers depend on our systems at peak throughputs exceeding 10,000 transactions per second, making reliability, consistency, and performance non-negotiable. We operate at the intersection of physical retail and distributed systems engineering, where every architectural decision has real consequences on store shelves worldwide.
 

What You’ll Do

As a Senior Software Engineer, you’ll own the design and delivery of scalable backend services and data pipelines that power store operations, merchandise location management, and electronic shelf label infrastructure at this scale. You’ll also contribute to the React Native mobile surfaces that associates use on the floor every day.
  Backend Engineering (Primary Focus ~70%)

• Design and build high-throughput, event-driven microservices using Java and Spring Boot that serve as the backbone for the SSOT of merchandise locations — a dataset of 600M+ records growing with every new DSL rollout
• Architect and maintain Kafka-based event streaming pipelines handling item location changes, replenishment updates, and ESL tag events at >10K TPS peaks across thousands of stores
• Own the full data lifecycle — from schema design and migrations (MySQL) to JPA/Hibernate access patterns through shared data access layers — optimized for read/write performance at massive scale
• Build resilient service integrations using Resilience4j (circuit breakers, retry policies, rate limiting) ensuring downstream consumers — operating at peak TPS — experience consistent, low-latency responses
• Implement and maintain multi-module Maven builds across a 12+ module microservice architecture
• Write production-ready code with strong observability — structured logging to OpenObserve/Splunk, meaningful metrics, and alerting that matters at scale
• Contribute to CI/CD pipelines via Looper (Jenkins) for automated build, test, and deployment workflows
• Deploy and operate services on Kubernetes (KITT), understanding pod lifecycle, scaling strategies, and deployment configurations for high-availability systems
   

Frontend Engineering (Secondary Focus ~30%)

• Build and maintain features in the mod-flex React Native mini-app running inside the Me@Walmart (Allspark) container
• Work with TypeScript, Redux, and React Navigation to deliver associate-facing experiences that surface real-time location and DSL data
• Consume REST APIs from backend services with proper error handling and state management
• Maintain 95%+ Jest test coverage standards for all frontend contributions
• Collaborate with designers and product managers to ship intuitive, performant mobile experiences
   

What You’ll Create With

• Backend: Java, Spring Boot, Maven, Kafka (Avro), MySQL, Spring Data JPA, Resilience4j
• Frontend: TypeScript, Re