Client: Walmart
Location: Sunnyvale, CA (On-site / Hybrid)
Engagement Type: Contract
About the Role
Walmart's Global Tech hub in Sunnyvale, CA is looking for a talented Java Backend Developer to design and build robust, scalable backend systems that power one of the world's largest retail ecosystems. You will work alongside world-class engineers to architect and deliver high-throughput, fault-tolerant services that handle massive transaction volumes across Walmart's digital and in-store platforms.
Key Responsibilities
- Design, develop, and maintain high-performance Java-based backend services and microservices for enterprise-scale applications.
- Architect and implement RESTful APIs consumed by web, mobile, and internal service clients.
- Apply strong knowledge of data structures and algorithms to solve complex engineering problems efficiently.
- Lead and participate in system design discussions, translating business requirements into scalable, maintainable technical solutions.
- Build and manage microservices architectures using frameworks such as Spring Boot and Spring Cloud.
- Ensure high availability, fault tolerance, and performance optimization across distributed systems.
- Conduct thorough code reviews, mentor junior developers, and uphold engineering best practices.
- Collaborate with frontend teams, data engineers, DevOps, and product managers in an Agile environment.
- Contribute to CI/CD pipeline improvements, automated testing, and deployment strategies.
- Monitor system health, diagnose bottlenecks, and implement proactive performance tuning.
Required Skills & Experience
- 9 years of professional backend development experience with strong expertise in Java (Java 11+).
- Deep understanding of Data Structures and Algorithms ability to design and analyze solutions for time and space complexity.
- Strong System Design skills experience designing large-scale distributed systems, including caching strategies, load balancing, database sharding, and message queuing.
- Hands-on experience building and deploying Microservices service discovery, circuit breakers, API gateways, and event-driven communication.
- Proficiency designing and consuming REST APIs versioning, authentication (OAuth2/JWT), rate limiting, and documentation (Swagger/OpenAPI).
- Experience with Spring Boot, Spring MVC, Spring Security, and related frameworks.
- Strong working knowledge of relational databases (MySQL, PostgreSQL) and NoSQL databases (Cassandra, MongoDB, or Redis).
- Familiarity with messaging platforms such as Kafka or RabbitMQ.
- Proficiency with Git, Maven/Gradle, and standard SDLC tooling.
- Experience with containerization using Docker and orchestration via Kubernetes.
Preferred / Nice-to-Have Skills
- Experience working with cloud platforms AWS, GCP, or Azure in a production environment.
- Familiarity with GraphQL or gRPC as alternatives to REST.
- Exposure to large-scale retail, e-commerce, or fintech backend systems.
- Knowledge of observability tooling Prometheus, Grafana, Splunk, or Datadog.
- Experience with infrastructure-as-code tools such as Terraform or Helm.
- Understanding of security best practices in distributed systems.
Educational Qualifications
Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field, or equivalent hands-on experience.