Sr. Machine Learning Engineer, Responsible AI– Applied Research Science

Pinterest is seeking a Senior Machine Learning Engineer to join the Responsible AI team within the Advanced Technologies Group (ATG). ATG is Pinterest's advanced machine learning team, focused on keeping Pinterest at the forefront of ML across recommendations, ranking, content understanding, and more. The Responsible AI team works horizontally across the company on initiatives including Generative AI alignment, evaluation, and mitigations, ML Fairness, and user-facing features like skin tone, hair pattern, and body type refinements.

• Design and drive projects in the responsible AI frontier to identify, avoid, and mitigate bias across a wide range of ML applications, including Gen AI product evaluations, foundation model safety fine-tuning and alignment, and Red Teaming.
• Collaborate with engineering teams (trust and safety, ML Platform, Content Understanding, Search, Homefeed) to leverage platforms and signals and drive adoption of Responsible AI practices and ML Fairness tooling.
• Mentor junior engineers on the Responsible AI team and across the company on the R-AI space.
• Work with the team and senior leaders to define and drive technical strategy in this area.

• Extensive, real-world experience applying advanced ML methods to production systems, with a strong track record in responsible technology (fairness, ethics, societal considerations).
• Deep familiarity with cutting-edge ML architectures (e.g., transformer-based models, 2-tower architectures, LLMs, VLMs) and their applications in large-scale Search and Recommender Systems.
• Proven ability to measure, deploy, and refine fairness interventions and broader Responsible AI solutions at scale.
• 4+ years working experience in engineering teams building large-scale ML-driven user-facing products.
• 1+ years experience leading cross-team engineering efforts.
• Masters or PhD in Computer Science or related fields.

• Publications at top ML conferences.
• Experience using Cursor, Copilot, Codex, or similar AI coding assistants.
• Familiarity with LLM-powered productivity tools for documentation search, experiment analysis, SQL/data exploration, and engineering workflow acceleration.
• Expertise in scalable realtime systems that process stream data.
• Passion for applied research and the Pinterest product.

Base salary range: $189,721—$332,012 USD. The position is also eligible for equity. Final salary based on location, travel, relevant prior experience, or particular skills and expertise. Benefits information available on Pinterest careers site.

This role is remote-friendly and can be situated anywhere in the United States. The role will need to be in the office for in-person collaboration 1-2 times per quarter. This position is not eligible for relocation assistance.

Apply via the Pinterest careers job posting.