Senior, Software Engineer

Walmart•Sunnyvale, CA

20h•Hybrid

About The Position

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. Immigration Sponsorship support will NOT be available for this position.

Requirements

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.
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).
Ability to collaborate cross‑functionally and influence architectural decisions across multiple teams.
A developer‑first mindset, with a passion for designing intuitive, scalable, and future‑ready platforms.
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.
OR 5 years’ experience in software engineering or related area.

Nice To Haves

Familiarity with agentic systems, autonomous workflows, or emerging middleware patterns is a plus.
Master’s degree in Computer Science, Computer Engineering, Computer Information Systems, Software Engineering, or related area and 1 year's experience in software engineering or related area.
Background in creating inclusive digital experiences, demonstrating knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly.
Knowledge of accessibility best practices and joining us as we continue to create accessible products and services following Walmart’s accessibility standards and guidelines for supporting an inclusive culture.

Responsibilities

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).
Build and optimize Node.js, Java, or Rust‑based services supporting developer platforms and orchestration layers.
Integrate UI, API, and backend systems to deliver cohesive, experience‑centric platform capabilities.

Benefits

Incentive awards for your performance.
401(k) match
Stock purchase plan
Paid maternity and parental leave
PTO
Multiple health plans
Competitive pay
Performance-based bonus awards
Health benefits include medical, vision and dental coverage.
Financial benefits include 401(k), stock purchase and company-paid life insurance.
Paid time off benefits include PTO (including sick leave), parental leave, family care leave, bereavement, jury duty, and voting.
Short-term and long-term disability
Company discounts
Military Leave Pay
Adoption and surrogacy expense reimbursement
PTO and/or PPTO that can be used for vacation, sick leave, holidays, or other purposes.
Walmart-paid education benefit program for full-time and part-time associates in Walmart and Sam's Club facilities. Programs range from high school completion to bachelor's degrees, including English Language Learning and short-form certificates. Tuition, books, and fees are completely paid for by Walmart.