Software Engineer III - Agentic AI, Prompt engineering

Position Summary

Cortex Team is Walmart’s core A.I. conversational platform, powering the vision of delivering the world’s best personal assistants to Walmart’s customers, accessible via natural voice commands, text messages, rich UI interactions, and a mix of all of the above via multi-modal experiences. We are building and designing the next generation of Natural Language Understanding (NLU) services that other teams can easily integrate and leverage, and build rich experiences: from pure voice and text shopping assistants to customer care channels, to mobile apps with multi-modal interaction modes.

We need passionate and seasoned NLP data-scientists to help us improve and evolve our capabilities, taking into account the full conversational context, multi-modal interactions, and an ever increasing list of use cases. You will have an opportunity to contribute to the design, architecture, and implementation of an innovative, mission-critical product, driven by data science, used daily by people and loved by customers. As part of the emerging tech group, you will also have the opportunity to build demos, proofs of concept, white papers, and blogs.

What youinally do

Answer not provided in a structured way in the input; the essence is to contribute as an NLP data scientist to improve conversational AI capabilities for Walmart by analyzing data, building models, and delivering results that impact product experiences.

Minimum Qualifications

• Experience with Python; solid knowledge of SQL.
• At least five years of hands-on experience with classical ML models, test/train/evaluation metrics, key parameters/techniques that affect model performance, and agentic flow systems.
• Understanding of relevant statistical measures such as confidence intervals, significance of error measurements, and development and evaluation data sets.
• Familiarity and ideally experience with NLU/NLP, more recent deep ML models (e.g., Transformers, BERT, Llama, GPTs, Gemini) and safe fine-tuning of these.
• A business analytical mind; ability to communicate with consumers of the model and present results in intuitive ways.
• Experience analyzing data to identify patterns and conducting error/deviation analysis; passion for fixing issues in the data and finding the optimal representation.
• Ability to take a project from scoping requirements through actual launch.
• A continuous drive to explore, improve, enhance, automate, and optimize models and products.
• Excellent oral and written communication skills.
• Bachelor’s degree or certification in Machine Learning, Computer Science, Engineering, Mathematics, Statistics or related field.

Preferred Qualifications

• Exposure to real-world, production-grade agentic systems.
• Familiarity with LLM serving optimizations and multi-LoRa.
• Ability to develop experimental and analytic plans for data modeling processes, use of strong baselines, and accurately determine cause-and-effect relationships.
• Strong attention to detail and exceptional level of organization.
• Proven ability to achieve results in a fast-paced, highly collaborative, dynamic work environment.
• Hands-on expertise across the full model lifecycle, including data pipelines, data extraction, model training, model serving, labeling tools, ML-ops, and related tooling.
• PhD in Machine Learning, Computer Science, Engineering, Mathematics, Physics, Statistics or related field.

About Walmart Global Tech

Imagine one line of code making life easier for hundreds of millions of people. Walmart Global Tech is a team of software engineers, data scientists, cybersecurity experts and service professionals within Walmart that innovates at scale and drives the next retail disruption. We are people-led and tech-empowered, with roles from entry opportunities to defining career milestones.

Walmart’s culture is a competitive advantage, fostered by collaboration, alignment, and speed. We use our campuses to create purposeful connection and invest in our associates. Our hubs include Bentonville, AR; with primary hubs in the San Francisco Bay Area and New York/New Jersey.

Benefits

Beyond competitive compensation, Walmart offers incentive awards, 401(k) match, stock purchase plan, paid maternity and parental leave, PTO, health plans, and more.

Equal Opportunity Employer

Walmart, Inc. is an Equal Opportunity Employer. We value belonging, diverse styles, experiences, identities, ideas and opinions, and welcome all people.

The information herein is intended to indicate the general nature and level of work performed in the role and is not a comprehensive inventory of all responsibilities and qualifications. The full Job Description can be made available during the hiring process.

Primary Location

1395 Crossman Ave, Sunnyvale, CA , United States of America