Walmart

Principal, Software Engineer

Walmart
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6 days ago
Sunnyvale, CA, USAStaff+
H1B sponsor

Base Salary

$143k - $286k/yr

Responsibilities

  • Lead the technical execution and development of a 30+ engineer organization.
  • Build scalable measurement platforms covering incrementality, attribution, data cleanroom measurement, partner integrations, and GenAI-powered reporting.
  • Solve large-scale AdTech problems using machine learning, transformer models, and statistical methods.
  • Define technical direction, conduct design reviews, and align engineering strategy with business objectives.
  • Develop stable and correct real-time optimization and offline reporting capabilities.
  • Troubleshoot production and business issues, coordinate support teams, execute resolution plans, and document outcomes.
  • Mentor engineers and promote knowledge sharing, innovation, and continuous improvement.

Requirements

  • 8+ years of experience in ML and data-intensive platform development.
  • 4+ years of experience as a staff-plus technical lead.
  • Bachelor’s degree in a relevant field and 5 years of software engineering experience, or 7 years of software engineering experience.
  • Experience with distributed data processing tools and databases such as Spark Streaming, Flink, Kafka, Ray, BigQuery, Druid, and Cassandra.
  • Experience applying statistical and machine learning methods for classification, regression, ranking, or recommendation.
  • Experience training transformer-based models and implementing real-time inference on GPU-backed infrastructure.
  • Familiarity with PySpark, PyTorch, CUDA, Triton, and GenAI techniques including MCP, RAG, re-ranking, agent skills, context engineering, and fine-tuning.
  • Experience collaborating with data scientists, machine learning engineers, and product managers.
  • Experience in AdTech measurement and knowledge of targeting, measurement, identity mapping, bidding, or optimization.
  • Preferred qualifications include a master’s degree or PhD, academic publications or patents, real-time streaming experience, ads auction retrieval and ranking, bid optimization, query optimization, distributed systems, and WCAG 2.2 AA accessibility knowledge.

Benefits

  • Medical, vision, and dental coverage.
  • 401(k), stock purchase, company-paid life insurance, and performance-based bonuses.
  • Paid time off and/or PPTO, including sick leave, holidays, parental leave, family care leave, bereavement, jury duty, and voting leave.
  • Short-term and long-term disability, company discounts, military leave pay, and adoption and surrogacy expense reimbursement.
  • Walmart-paid education benefits covering eligible programs, tuition, books, and fees.
  • The position is located in Sunnyvale, California; benefits vary by job classification and length of employment.

Tech Stack

Apache CassandraApache FlinkApache KafkaApache SparkGoogle BigQueryPyTorch
Walmart

About Walmart

10,000+ employees

Walmart is a global omnichannel retailer that sells groceries, general merchandise, and services through Walmart and Sam's Club stores and online marketplaces for consumers and small businesses. Its model spans physical retail, e-commerce, advertising, and a vast supply chain, plus pharmacy, health, and financial services. Founded in 1962 and headquartered in Bentonville, Arkansas, Walmart Inc. is a public company on the NYSE (WMT) operating in the U.S. and multiple international markets.

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