Senior Staff ML Engineer, Search & Recommendation

11h•Remote

About The Position

Reddit is a community of communities built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. With over 100,000 active communities and approximately 121 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. The Search Recommendations & Relevance team at Reddit is building the next generation of search, one that goes beyond “10 blue links” to deliver real answers, perspectives and conversation from the world's largest corpus of human conversation. This role powers both Reddit Search and its AI-native Search experience. Redditors produce amazing content about every niche topic, and this underleveraged data coupled with modern advances in AI systems presents a unique opportunity to quickly build a new kind of search engine. As a Senior Staff ML Engineer, you will design and build a large-scale system that powers end-to-end search relevance at scale. You’ll work across multiple areas of the stack, including query understanding, retrieval, ranking, features, measurement, LLM-based answers, RAG etc, partnering deeply with product, org leads, and other cross-functional teams to deliver reliable, high quality systems that can help Reddit Search scale to billions of users.

Requirements

10+ years of industry experience with deep expertise in large-scale search and recommendation systems.
Proven ability to identify key opportunities, define roadmaps and drive scalable improvement in search relevance.
Strong experience in building and deploying large-scale ML models using frameworks such as PyTorch or Tensorflow.
Experience working with LLM in production, including evaluation, tuning and deployment.
In-depth knowledge and experience working with lexical and semantic retrieval systems.
Proficiency in object-oriented programming (Python, Golang).

Nice To Haves

Experience building production Agentic AI frameworks.

Responsibilities

Contribute to advancing Reddit's Search and Recommendations products by designing AI-driven Search experience prioritizing seamless and delightful user experience.
Deeply understand the Reddit search product and drive the vision for the search relevance team.
Enhance core search retrieval and ranking, design and implement new search engine features, build and scale search indexes, develop and test new pipeline components. You will also deploy ML models, integrate LLMs, and ensure robust monitoring and smooth product integration throughout the process.
Collaborate across disciplines and with ML, Product, Infrastructure, and DS teams at Reddit to find technical solutions to complex challenges.
Mentor and guide senior and staff engineers in the team.
Influence org-wide technical direction and partner closely with senior leadership to shape the long-term roadmap

Benefits

Comprehensive Healthcare Benefits and Income Replacement Programs
401k with Employer Match
Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support
Family Planning Support
Gender-Affirming Care
Mental Health & Coaching Benefits
Flexible Vacation & Paid Volunteer Time Off
Generous Paid Parental Leave
Equity in the form of restricted stock units
Commission (depending on the position offered)
Medical, dental, and vision insurance