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

We are seeking a Senior Machine Learning Engineer to join our Responsible AI team. As part of Pinterest’s Advanced Technologies Group, you will design forward-thinking projects that ensure fairness and ethical AI across a range of products, from Gen AI to large-scale recommendation systems.

What You'll Do

• Design and drive projects in the responsible AI frontier to identify, avoid, and mitigate bias across a wide range of ML applications at Pinterest, including Gen AI product evaluations, foundation model safety fine‑tuning, alignment, and Red Teaming.
• Collaborate with cross‑functional engineering teams (trust & safety, ML Platform, Content Understanding, Search, Homefeed) to adopt Responsible AI practices and fairness tooling.
• Mentor junior engineers on the Responsible AI team and across the company.
• Work with senior leaders to define and drive the technical strategy for responsible AI.

What We're Looking For

• Extensive real‑world experience applying advanced ML methods to production systems with a strong record in responsible technology (fairness, ethics, societal impact).
• Deep familiarity with cutting‑edge ML architectures (transformer‑based models, 2‑tower architectures, LLMs, VLMS) in large‑scale search and recommender systems.
• Proven ability to measure, deploy, and refine fairness interventions at scale, bridging research with product impact.
• 4+ years of engineering experience building large‑scale ML‑driven, user‑facing products.
• 1+ year of experience leading cross‑team engineering efforts.
• Masters or PhD in Computer Science or related fields.

Nice to Have

• Publications at top ML conferences.
• Experience using AI coding assistants (Cursor, Copilot, Codex) for development and debugging.
• Familiarity with LLM‑powered productivity tools for documentation, experiment analysis, and data exploration.
• Expertise in scalable real‑time stream processing systems.
• Passion for applied research and Pinterest products.

Relocation Statement

• This position is not eligible for relocation assistance.

In‑Office Requirement

• Remote work is allowed, but the role requires in‑office collaboration 1‑2 times per quarter anywhere in the United States.

Base salary range: $189,721—$332,012 USD. The position is also eligible for equity. Final salary depends on location, experience, and skills.

Our Commitment To Inclusion:
Pinterest is an equal‑opportunity employer. All qualified applicants will receive consideration without regard to race, color, ancestry, national origin, religion, gender, sexual orientation, age, marital status, veteran status, disability, or other protected characteristics. Please let us know if you require accommodations during the application process.