Staff Software Engineer – Machine Learning

PayPal

full-time

Posted on: 9/25/2025

Origin: • 🇺🇸 United States • California

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💰 $152,500 - $262,350 per year

Lead

AWSAzureCloudGoogle Cloud PlatformPythonPyTorchScalaScikit-LearnSparkTensorflow

About the role

Build the next generation of product discovery for millions of global shoppers
Own backend and data infrastructure powering search, recommendations, and catalog knowledge at global scale
Contribute to product search stack including indexing pipelines and query-time services
Collaborate closely with backend engineers and catalog data teams to integrate models and data
Work on query and document understanding, product entity modeling and enrichment, and taxonomy structuring
Design and implement retrieval and ranking algorithms and evaluate search quality
Lead development and optimization of advanced machine learning models
Oversee preprocessing and analysis of large datasets
Deploy, maintain, monitor, and iterate on ML solutions in production environments
Integrate ML models into products and services and evaluate model performance

5+ years relevant experience (or any equivalent combination of education and experience)
Bachelor's degree OR equivalent combination of education and experience
Preferred: 8+ years industry experience with deep learning architectures and production ML models
Extensive experience with ML frameworks like TensorFlow, PyTorch, or scikit-learn
Expertise in cloud platforms (AWS, Azure, GCP) and tools for data processing and model deployment
Strong proficiency in Python, Scala, or other programming languages
Experience working with large datasets and data processing pipelines (e.g., Dataflow, Spark, Flink)
Experience with scalable architectures
Experience working on search or recommendation systems at scale
Familiarity with A/B testing and experimentation methodologies for search relevance improvement
Strong communication and collaboration skills
Experience taking projects from research and prototyping to production deployment