Instacart is seeking a Senior Staff Machine Learning Engineer to lead the technical vision for AI in search and discovery. This role involves architecting and building large-scale ML systems that combine generative AI, LLM reasoning, retrieval, ranking, and personalization to create next-generation shopping experiences. The engineer will also build and operate production ML systems serving millions of users in real-time and mentor other engineers.

Instacart is seeking a Senior Machine Learning Engineer II for their Search & Recommendations Ranking team. This role focuses on building and optimizing the foundational ranking backbone that powers the entire shopping journey, aiming to improve metrics beyond clicks, such as GTV, basket lift, and retention. The position involves architecting multi-task/multi-objective models, designing value-aware optimization systems, and enhancing retrieval with LLMs, while also owning the inference layer and advancing evaluation practices. Experience with production ML, multi-objective optimization, and online testing is required, with a preference for expertise in multi-task learning, causal modeling, and low-latency ranking services.

Senior Staff Machine Learning Engineer, Ads Quality at Instacart. This role focuses on designing and building innovative AI-powered systems for digital advertising quality, including optimizing ads pacing/bidding, retrieval, and auction processes. It involves identifying and building generative AI solutions, recommendation frameworks, and advanced systems to improve advertiser experience and campaign efficacy. The role also requires defining technical strategy, mentoring engineers, and collaborating across teams. It's a hands-on IC/TL role at the Director+ level.

Staff Software Engineer for Instacart's Home & Cross-Retailer Search team, focusing on building and scaling the infrastructure for customer discovery, search, ranking, indexing, and personalization. The role involves defining technical vision, owning architecture, partnering with ML teams, and improving developer velocity. Requires strong backend systems experience, particularly in search, recommendations, or feed-ranking systems.

Senior Software Engineer II on the ML/AI Platform team responsible for building and owning the internal platform that supports training (fine-tuning) and deploying (batch inference) AI models across the organization. This includes defining the platform, building SDKs, and supporting the necessary infrastructure. The role requires high ownership and leadership in a complex, distributed systems environment.

Senior Data Scientist on the Shopping Experience team at Instacart, focusing on Search. This role owns the analytics and experimentation strategy for search relevance, ranking quality, and latency, partnering with Product, Engineering, and ML. Responsibilities include defining metrics, designing and analyzing A/B tests, building diagnostic analyses, connecting offline model evaluation with online metrics, and improving data quality for search. The role requires strong analytical skills, product sense, and communication, with experience in A/B testing, SQL, Python/R, and modern AI tooling. Preferred qualifications include experience in search relevance, recommendations, NLP, embeddings, and bridging offline/online evaluation.

Senior Machine Learning Engineer with Operations Research background to join the Service Availability & Routing team. Focuses on designing, developing, and deploying ML solutions for marketplace challenges like order batching, shopper routing, service availability prediction, and real-time assignment, directly impacting profitability and shopper experience at scale. Collaborates with product, data science, and backend engineers.

Senior Data Scientist role focused on designing, developing, and optimizing auction and bidding systems for Instacart's advertising marketplace. This involves building ML models for forecasting and optimization, running experiments, and applying expertise in causal inference and mechanism design to ensure a fair and efficient marketplace that benefits advertisers and consumers.

Instacart is hiring a Senior Machine Learning Engineer II for their Growth Modeling team. This role will focus on developing and deploying ML/AI solutions for incentive optimization to drive business growth. Responsibilities include identifying opportunities, defining roadmaps, mentoring team members, and partnering with cross-functional teams. Experience in causal modeling, LLMs, and reinforcement learning is preferred.