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Founded in 2012, Instacart offers on-demand food and grocery delivery across the United States. Named the #1 Most Promising Company in America by Forbes magazine, flexible Instacar
Senior Machine Learning Engineer
Location
California + 18 moreAll locations: California | Colorado | Connecticut | District Of Columbia | Hawaii | Illinois | Maine | New Hampshire | New Jersey | New York | Oregon | Maryland | Massachusetts | Pennsylvania | Rhode Island | Texas | Vermont | Virginia | Washington
Posted
62 days ago
Salary
$201K - $253.5K / year
Seniority
Senior
Job Description
Senior Machine Learning Engineer
Instacart
• Lead research and development of pCTR and conversion prediction models, with a focus on improving calibration, reducing training data biases (selection bias, position bias, optimizer’s curse), and advancing model accuracy across Instacart’s ads surfaces. • Design and implement debiasing techniques such as Mixed Negative Sampling (MNS), Inverse Propensity Weighting (IPW), counterfactual risk minimization, and calibration methods (Platt scaling, isotonic regression) to address systematic prediction biases. • Contribute to the next-generation Multi-Domain Multi-Task (MDMT) model architecture, incorporating innovations like Mixture-of-Experts (MoE), Transformer layers for sequential user behavior, and LoRA adaptors for scalable domain fine-tuning. • Drive sequence modeling initiatives including the TIGER generative retrieval system and Semantic ID representation learning, expanding their application across ads surfaces such as Product Details, Search and other placements. • Collaborate with the broader ML community in the company on the path toward Foundation Models using autoregressive user behavior prediction. • Formulate and scope ambiguous modeling problems from first principles. Translate business observations (e.g., overcalibration patterns, cold-start underperformance) into well-defined ML research directions with clear evaluation criteria. • Publish and present findings internally. Contribute to the team’s culture of technical rigor through design reviews, paper sharing, and experiment retrospectives.
Job Requirements
- PhD/Master in machine learning, statistics, computer science, information retrieval, or a closely related quantitative field.
- 6+ years of combined academic and industry experience (including PhD research) applying ML to ranking, recommendation, or prediction problems at scale.
- Deep understanding of CTR/conversion prediction modeling, including familiarity with architectures such as Deep & Wide, DeepFM, DCN, and multi-task learning formulations.
- Strong foundation in causal inference, counterfactual reasoning, and training data bias mitigation. Ability to reason about selection bias, position bias, and propensity-based correction methods.
- Proficiency in Python and deep learning frameworks (PyTorch, Tensorflow, JAX). Fluency in data manipulation tools (SQL, Spark, Pandas).
- Track record of formulating ambiguous problems into well-scoped ML research directions and delivering results through rigorous experimentation.
- Strong written and verbal communication skills. Ability to explain complex modeling decisions to cross-functional stakeholders including product managers and data scientists.
Benefits
- Instacart provides highly market-competitive compensation and benefits in each location where our employees work.
- Eligible for a new hire equity grant as well as annual refresh grants.
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