Senior, Software Engineer

Job Description

Position Summary... We are seeking a Senior Full Stack Software Engineer with strong experience in building high‑scale distributed systems using Java, Rust, and NodeJS, along with modern Front‑End development skills. In this role, you will contribute to evolving and operating the Marketplace API Gateway, which handles high‑volume traffic from sellers and solution partners, and help design and build the new Marketplace GraphQL (mGQL) experience‑centric gateway. You will also work on enhancing developer.walmart.com to deliver intuitive, end‑to‑end developer experiences across our Marketplace API ecosystem, and extend the MCP (Modal Context Protocol) gateway to enable agentic integrations within the Marketplace domain. The ideal candidate is comfortable working across backend services, federated GraphQL patterns, and developer‑focused platform capabilities. What you'll do... About the team: We are seeking a Senior Full Stack Software Engineer with strong experience in building high‑scale distributed systems using Java, Rust, and NodeJS, along with modern Front‑End development skills. In this role, you will contribute to evolving and operating the Marketplace API Gateway, which handles high‑volume traffic from sellers and solution partners, and help design and build the new Marketplace GraphQL experience‑centric api gateway (Apollo GQL Federation Framework). You will also work on enhancing developer.walmart.com to deliver intuitive, end‑to‑end developer experiences across our Marketplace API ecosystem and extend the MCP (Modal Context Protocol) gateway to enable agentic integrations within the Marketplace domain. The ideal candidate is comfortable working across backend services, federated GraphQL patterns, and developer‑focused platform capabilities. *****Immigration Sponsorship support will NOT be available for this position***** What You’ll Do Design, build, and evolve high‑scale distributed services that power the Marketplace API Gateway supporting critical seller and partner traffic. Lead the development of the mGQL (Marketplace GraphQL) gateway, including schema design, routing logic, federation strategy, and performance optimization. Extend and enhance the MCP (Modal Context Protocol) gateway to enable agentic workflows and context‑aware integrations across Marketplace domain systems. Own the end‑to‑end lifecycle of backend services, from design and implementation through testing, deployment, monitoring, and ongoing reliability. Implement and drive best practices for resiliency, observability, rate limiting, quotas, latency reduction, SLAs, and fault isolation across gateway platforms. Build seamless, intuitive developer experiences through developer.walmart.com, including onboarding flows, documentation pipelines, SDK integrations, and developer tooling. Partner closely with product, content, and platform teams to ensure Marketplace APIs are discoverable, consistent, secure, and easy to integrate. Champion and drive improvements in API versio

Required Skills