Drool Rule Engine Developer Jobs (NOW HIRING)

Position Summary...Join Walmart’s Derivator Platform team within the Catalog organization. Derivator is a high-scale, domain-agnostic rule derivation platform that processes hundreds of thousands of events per second with 99.99% availability, powering critical business decisions across inventory, fulfillment, seller eligibility, shipping restrictions, and customer experiences at Walmart scale.
As a Senior Software Engineer, you will architect, build, and operate the microservices and data pipelines at the heart of Walmart’s supply chain intelligence. We are looking for engineers who are highly motivated to leverage AI-assisted development tools to accelerate design, coding, testing, and code review — treating AI as a core part of their engineering workflow, not just an occasional aid. What you'll do...About the Team

• This is a platform engineering role — the Derivator platform is a shared service powering 15+ business domains across Walmart (inventory exception, replenishment, fulfillment path eligibility, one-day shipping, seller eligibility, gifting, cross-border shipping restrictions, customer subscriptions, and more). Your work directly influences the shopping experience for millions of Walmart customers every day.
• We are building an AI-forward engineering culture — engineers who proactively integrate AI tools into design discussions, sprint planning, code reviews, and architecture decisions will have a direct impact on team velocity and platform quality.
• The team operates at the intersection of real-time event processing and complex rule evaluation — engineers who thrive on making large-scale systems observable, resilient, and developer-friendly will find this role deeply rewarding.
• The platform is actively growing — current investment areas include multi-domain rule sequencing, configuration UI tooling to reduce operational overhead, cloud infrastructure migrations, batch integration improvements, and tenant-level cost metering.
• You will work across the full engineering lifecycle — from design and development to deployment, monitoring, and incident response — in a fast-paced, high-impact environment.

What You’ll Do

• Design and build distributed microservices across the full derivation lifecycle — inbound data processing, core rule evaluation, outbound distribution, scheduling, simulation, auditing, and notification — deployed on Walmart’s private cloud infrastructure
• Own high-throughput Kafka event streaming pipelines processing hundreds of thousands of events per pipeline; design for fault isolation, multi-region routing, and horizontal auto-scaling
• Develop and evolve a domain-agnostic rule execution engine, enabling configurable business rule evaluation across supply chain domains such as inventory management, fulfillment eligibility, seller performance, geo-shipping restrictions, customer experiences, and more
• Build and optimize data persistence and indexing layers across Cassandra, BigQuery, and search indexes — supporting real-time derivation, sweep processing, and audit/monitoring workflows
• Drive large-scale Apache Spark batch processing jobs on cloud infrastructure to identify and fan out impacted entities across millions of records following rule changes
• Implement simulation and sweep capabilities — real-time and offline rule evaluation to assess business impact before deployment, enabling data-driven decision-making with downloadable reports
• Actively use AI-assisted development tools (e.g., GitHub Copilot, Wibey, or equivalent) for code generation, design brainstorming, test authoring, documentation, and code review — and champion their adoption within the team
• Ensure platform reliability and observability through metrics, distributed tracing, lag-based alerting, and enforcing 99.99% SLA commitments
• Contribute to platform evolution: infrastructure migrations, batch processing integration, multi-domain rule sequencing, UI tooling for configuration management, and cost metering
• Collaborate with product managers, domain teams, and rule engine engineers to onboard new derivation domains and attributes with minimal friction
• Drive technical roadmap priorities and mentor engineers across the team

What You’ll Bring Required:

• 5+ years of software engineering experience building production-grade, high-throughput distributed systems
• Strong proficiency in Java and Spring Boot — RESTful microservices, dependency injection, async processing, and performance tuning
• Hands-on experience with Apache Kafka — producer/consumer patterns, consumer group management, lag monitoring, partition-level design, and exactly-once semantics
• Experience with Cassandra — data modeling, partition key design, tuning for high write/read throughput
• Experience with BigQuery — large-scale analytical queries, table partitioning, and integration with batch pipelines
• Experience with Apache Spark — large-scale distributed batch processing, job optimization, and GCP Dataproc or equivalent
• Familiarity with container orchestration (Kubernetes or equivalent) — deployment, scaling, health checks, and namespace management
• Experience building event-driven microservices architectures with strong understanding of fault isolation, idempotency, retry patterns, and eventual consistency
• Demonstrated use of AI-assisted development tools (Copilot, Cursor, or similar) as part of daily engineering workflow — for coding, testing, debugging, and documentation
• Strong debugging and root-cause analysis skills in distributed systems environments

Preferred:

• Experience with rule engines or business rule frameworks — applying configurable rules to data at scale
• Exposure to observability and distributed tracing tools for event-driven systems
• Understanding of supply chain, fulfillment, or e-commerce domain concepts (inventory management, fulfillment paths, seller operations, shipping logistics)
• Experience with multi-region event routing and consistency patterns
• Experience with GCP for cloud-native workloads
• Passion for exploring and evaluating emerging AI coding tools and sharing best practices with the team

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.
  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 expert's 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. Walmart’s culture is a competitive advantage, and it’s fostered by being together. Working together in person allows us to collaborate, align quickly and innovate with greater speed.  We use our campuses to create purposeful connection rooted in deepening understanding and investing in the development of our associates.  
Our hubs: Walmart is a global company with offices across the United States and around the world. Our global headquarters is in Bentonville, Arkansas, with primary hubs in the San Francisco Bay area and New York/New Jersey. 
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.
  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.
The annual salary range for this position is $117,000.00 - $234,000.00 Additional compensation includes annual or quarterly performance bonuses. Additional compensation for certain positions may also include :
- Stock

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Minimum Qualifications...

Outlined below are the required minimum qualifications for this position. If none are listed, there are no minimum qualifications.

Option 1: 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.
Option 2: 5 years’ experience in software engineering or related area. Preferred Qualifications...

Outlined below are the optional preferred qualifications for this position. If none are listed, there are no preferred qualifications.

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., We value candidates with a 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. The ideal candidate would have knowledge of accessibility best practices and join us as we continue to create accessible products and services following Walmart’s accessibility standards and guidelines for supporting an inclusive culture. Primary Location... 1375 Crossman Ave, Sunnyvale, CA 94089-1114, United States of America Walmart and its subsidiaries are committed to maintaining a drug-free workplace and has a no tolerance policy regarding the use of illegal drugs and alcohol on the job. This policy applies to all employees and aims to create a safe and productive work environment.