Senior Machine Learning Engineer, Search & Recommendations

Instacart

Posted 3mo ago

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Architect the ranking backbone unifying query understanding, personalization, multi-objective ranking, ads, and merchandising
Design and build a search autosuggest system optimized for personalization and value-based relevance
Design long-horizon objective functions and build uplift/causal value models
Develop production-grade Multi-Task Learning models
Own the inference layer: goal-aware re-rankers, diversity and quality constraints, safe exploration, and latency optimization
Advance evaluation practices: online experiments, long-horizon cohort metrics, counterfactual evaluations, and attribution pipelines
Partner across teams to translate business goals into ranking policies and measurable ROI
Mentor ML engineers to build expertise in ranking, causal inference, and scalable serving systems

Expertise in multi-task learning architectures (e.g., MMOE/PLE, shared encoders)
Expertise in calibration, counterfactual evaluation, uplift/causal modeling
Expertise in contextual bandits for exploration
Experience building low-latency ranking services
Experience with feature stores, caching, vector + lexical retrieval, re-ranking, and A/B testing infrastructure
Expertise in constraint-aware inference
Hands-on experience with LLMs as feature/recall enhancers (e.g., embeddings, adapter tuning)

Skills