Senior, Software Engineer; Backend

Immigration sponsorship is not available for this role. Applicants must be authorized to work for any employer in the United States without current or future visa sponsorship.

This is a full-time onsite role based in Sunnyvale, CA; remote and hybrid options are not available.

About the Team:
Every time a customer opens a Walmart product page, in any of our markets, a decision engine works behind the scenes to choose the right seller, the right price, and the right delivery promise, shaped by what that customer cares about. That’s us.

The Buybox team owns the offer-selection that powers Search, the Product Details Page, and Recommendations. These systems serve high-volume traffic on a tight latency budget, so every millisecond and every design decision counts. Getting it right matters to customers, to sellers, and to Walmart’s business.

We’re a small team that works like a startup inside one of the world’s largest retailers. Ideas move quickly from whiteboard to production. Engineers own systems end to end, and AI agents are part of how we build every day. We like hard problems, honest debate about design, and helping each other get better.

What You’ll Do:

• Design and build high-throughput, low-latency services that power offer selection and pricing at scale.
• Build and evolve the streaming and batch pipelines (Kafka, Flink, Big Query, Airflow) that feed our algorithms and AI/ML models.
• Partner with data scientists to take ML models from experiment to production, and measure real customer impact through A/B tests.
• Build with AI agents and AI-assisted development, and help shape how the team uses them.
• Lead design and code reviews, and help us move faster, from PR to build to canary deploy.
• Build the tooling that keeps our decisions trustworthy: flip analysis, parity testing, and experiment dashboards.
• Drive technical discussions with product, science, and partner teams across Search, Item Page, and Recommendations.

What You’ll Bring:

• 5+ years building production software, including 3+ years in Java and/or Python.
• A strong foundation in distributed systems, data structures, and algorithms.
• Experience building and operating microservices (REST/GraphQL) that are highly available, fault tolerant, and scalable.
• Hands-on experience with streaming systems such as Kafka or Flink.
• Experience with a public cloud (GCP or AWS).
• Comfort owning ambiguous problems end to end and driving design decisions across teams.
• The ability to explain complex technical ideas clearly to engineers and non‑engineers alike.

Preferred

Skills and Experience:

• Experience building production‑grade AI/ML systems.
• Experience with experimentation platforms and A/B testing at scale.
• Familiarity with Big Query, Airflow, or ML pipeline tooling [e.g., Tensor Flow/Kubeflow].
• Background in pricing, marketplaces, offer ranking, or e‑commerce.
• Node.js or React, for internal tooling.

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. We’re 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…