Rust Contract Jobs in California (NOW HIRING)

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
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• 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.

• 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).
• 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.

About Walmart Global Tech:
Imagine working in an environment where one line of code can make life easier for hundreds of millions of people. That's what we do at Walmart Global Tech. Were a team of software engineers, data scientists, cybersecurity experts and service professionals within the world's leading retailer who make an epic impact and are at the forefront of the next retail disruption. People are why we innovate, and people power our innovations. We are people-led and tech-empowered. We train our team in the skillsets of the future and bring in experts like you to help us grow. We have roles for those chasing their first opportunity as well as those looking for the opportunity that will define their career. Here, you can kickstart a great career in tech, gain new skills and experience for virtually every industry, or leverage your expertise to innovate at scale, impact millions and reimagine the future of retail.
Flexible, hybrid work:
We use a hybrid way of working that is primarily in office coupled with virtual when not onsite. Our campuses serve as a hub to enhance collaboration, bring us together for purpose and deliver on business needs. This approach helps us make quicker decisions, remove location barriers across our global team and be more flexible in our personal lives.
Benefits:
Benefits: Beyond our great compensation package, you can receive incentive awards for your performance. Other great perks include 401(k) match, stock purchase plan, paid maternity and parental leave, PTO, multiple health plans, and much more.
Equal Opportunity Employer:

Walmart, Inc. is an Equal Opportunity Employer – “By Choice. We believe we are best equipped to help our associates, customers and the communities we serve live better when we really know them. That means understanding, respecting, and valuing unique styles, experiences, identities, ideas and opinions while being inclusive of all people.
The above information has been designed to indicate the general nature and level of work performed in the role. It is not designed to contain or be interpreted as a comprehensive inventory of all responsibilities and qualifications required of employees assigned to this job. The full Job Description can be made available as part of the hiring process.
At Walmart, we offer competitive pay as well as performance-based bonus awards and other great benefits for a happier mind, body, and wallet. 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. Other benefits include short-term and long-term disability, company discounts, Military Leave Pay, adoption and surrogacy expense reimbursement, and more.
You will also receive PTO and/or PPTO that can be used for vacation, sick leave, holidays, or other purposes. The amount you receive depends on your job classification and length of employment. It will meet or exceed the requirements of paid sick leave laws, where applicable.
For information about PTO, see https://one.walmart.com/notices.
Live Better U is a 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.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to a specific plan or program terms.
For information about benefits and eligibility, see One.Walmart.