Machine Learning Engineer II, Responsible AI

Pinterest•San Francisco, CA

1d•Hybrid

About The Position

Pinterest is seeking a Machine Learning Engineer II for the Responsible AI team within the Advanced Technologies Group (ATG). ATG focuses on keeping Pinterest at the forefront of machine learning technology across various applications like recommendations, ranking, and content understanding. The Responsible AI team specifically works on ensuring AI models are safe, bias-free, and aligned with Pinterest's vision and policies. This includes championing ML Fairness and developing user-facing features that enhance the product for all users, such as user-controllable skin tone, hair pattern search refinements, and body type features. The role involves executing projects in the responsible AI frontier, identifying and mitigating bias in ML applications including generative AI, and collaborating with other engineering teams to adopt and evaluate Responsible AI practices and tooling. The engineer will also mentor junior team members and contribute to defining the technical strategy in this area.

Requirements

Extensive, real-world experience applying advanced ML methods to production systems, with a strong track record in responsible technology - spanning fairness, ethics, and broader societal considerations.
Deep familiarity with cutting-edge ML architectures (e.g., transformer-based models, 2-tower architectures, LLMs) 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, bridging state-of-the-art research with tangible product impact.
2+ years working experience in the engineering teams that build large-scale ML-driven user-facing products
Masters or PhD in Comp Sci or related fields

Nice To Haves

Publications at top ML conferences
Experience using Cursor, Copilot, Codex, or similar AI coding assistants for development, debugging, testing, and refactoring
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

Responsibilities

Execute on projects in the responsible AI frontier, to identify, avoid, and mitigate bias across a wide range of ML applications at Pinterest including generative AI.
Collaborate with other engineering teams (trust and safety, user modeling, content understanding,) to leverage their platforms and signals and work with them to collaborate on the adoption and evaluation of Responsible AI practices and ML Fairness tooling across Pinterest.
Mentor junior engineers on the Responsible AI team and across the company on the R-AI space.
Work with the team and senior leaders at the company to define and drive technical strategy in this area.