Senior Software Engineer

Walmart

. Design, build, and evolve high-scale distributed services that power the Marketplace API Gateway supporting critical seller and partner traffic.

Posted 5/23/2026full-timeSunnyvale • California • 🇺🇸 United StatesSenior💰 $117,000 - $234,000 per yearWebsite

Tech Stack

Tools & technologies

Distributed SystemsGraphQLJavaJavaScriptNode.jsReactRustTypeScript

About the role

Key responsibilities & impact

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 versioning, schema governance, security standards, and public integration patterns to elevate developer experience.
Contribute to the architectural roadmap for agentic systems, supporting autonomous workflows, intelligent routing, and context-aware data flows.
Influence platform-wide patterns, protocols, and standards to ensure long-term scalability, maintainability, and evolution.
Develop performant UI surfaces and internal tools using modern front-end frameworks (React/TypeScript preferred).

Requirements

What you’ll need

Bachelor's degree in computer science, computer engineering, computer information systems, software engineering, or related area and 3 years’ experience in software engineering or related area.
5 years’ experience in software engineering or related area.
Strong experience designing and operating large-scale distributed systems and API gateway platforms.
Deep expertise in GraphQL, including schema design, federation, and performance optimization.
Solid understanding of backend service design, reliability engineering, observability, and fault-tolerant architectures.
Experience building developer platforms, public APIs, and tooling with a strong focus on developer experience (DX).
Working knowledge of modern protocols, API contracts, and platform governance practices.
Familiarity with agentic systems, autonomous workflows, or emerging middleware patterns is a plus.
Proficiency in one or more backend languages such as Node.js, Java, or Rust.
Hands-on experience with modern front-end frameworks (React/TypeScript preferred).

Benefits

Comp & perks

401(k) match
stock purchase plan
paid maternity and parental leave
PTO
multiple health plans
and much more

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

GraphQLNode.jsJavaRustReactTypeScriptdistributed systemsAPI gatewayreliability engineeringobservability

Soft Skills

leadershipcollaborationcommunicationproblem-solvinginfluence

Certifications

Bachelor's degree in computer scienceBachelor's degree in computer engineeringBachelor's degree in computer information systemsBachelor's degree in software engineering