Sr. Staff Machine Learning Engineer, Agentic Ads

About Pinterest: Millions of people around the world come to our platform to find creative ideas, dream about new possibilities and plan for memories that will last a lifetime. At Pinterest, we’re on a mission to bring everyone the inspiration to create a life they love, and that starts with the people behind the product. Discover a career where you ignite innovation for millions, transform passion into growth opportunities, celebrate each other’s unique experiences and embrace the flexibility to do your best work. Creating a career you love? It’s Possible. At Pinterest, AI isn't just a feature, it's a powerful partner that augments our creativity and amplifies our impact, and we’re looking for candidates who are excited to be a part of that. To get a complete picture of your experience and abilities, we’ll explore your foundational skills and how you collaborate with AI. Through our interview process, what matters most is that you can always explain your approach, showing us not just what you know, but how you think. You can read more about our AI interview philosophy and how we use AI in our recruiting process here . This is a rare opportunity to lead frontier machine learning work at Pinterest on one of the company’s highest-leverage surfaces: Ads ranking and auctions. In this Sr. Staff MLE role, the right candidate will define the technical strategy for next-generation ranking systems, applying AI- and agentic-driven development loops to accelerate modeling innovation, experimentation, and automation at massive scale. They’ll partner closely with senior leaders across product, applied science, and infrastructure to shape outcomes that directly impact advertiser performance, Pinner experience, and company revenue, while also setting modeling standards, influencing architecture across the ads ML stack, and mentoring top-tier technical talent. For someone excited by deep technical ownership, broad organizational influence, and the chance to build ambitious systems using rich multimodal data and a modern ML platform, this is an exceptionally high-impact leadership opportunity. What you’ll do: Lead the technical strategy for advancing ads ranking and bidding models using large scale ML and agentic development loops. Design, build and launch production models and signals that improve ads quality, relevance and long term value. Build and refine training, evaluation and feedback pipelines that continuously learn from online behavior, experimentation results and advertiser outcomes. Use AI to accelerate analysis and iteration while applying judgment and verification to ensure correctness and quality. Own the technical strategy for advancing ads ranking models, with a focus on AI/agentic development loops and automation. Build and refine agentic training and evaluation pipelines that continuously learn from feedback signals, offline and production behavior. Partner closely with product, applied science, and infra teams to translate business objectives into modeling roadmaps and success metrics. Ensure models meet the bar for reliability, safety, fairness, and compliance with privacy and policy constraints. Drive technical design reviews, set modeling best practices, and make high-impact architectural decisions across the ads ML stack. Mentor and uplevel other MLEs and scientists in advanced modeling techniques, tooling, and agentic workflows. Lead frontier work applying AI- and agentic-driven development loops to one of Pinterest’s highest-leverage systems: ads ranking and auctions. Shape product outcomes at massive scale, with direct impact on advertiser value, Pinner experience, and company revenue. Partner with senior leaders across product, research, and infra, gaining broad visibility and influence on ads strategy. Grow as a technical leader by setting modeling standards, mentoring senior talent, and driving multi-quarter roadmaps across teams. Access Pinterest’s rich multimodal data and modern ML/infra stack to experiment quic