Senior Staff Machine Learning Systems Engineer, Indexing & Retrieval Search

Reddit, Inc. is a community-driven platform known for its diverse conversations and vast user engagement. They are seeking a Senior Staff Machine Learning Systems Engineer to lead the development of ML Indexing & Retrieval systems, focusing on building scalable and reliable platforms that enhance machine learning capabilities.

Responsibilities:

• Lead the technical strategy, architecture, and implementation of Reddit’s next-generation ML Indexing & Retrieval engine, integrating capabilities across lexical and vector indexing, low-latency retrieval, and emerging GenAI applications
• Partner closely with product engineers across Content Understanding, Search, Feeds, Ads, Growth, and Safety to deliver high-quality experiences
• Define best practices for observability, reliability, and operational excellence in large-scale distributed systems
• Mentor and guide engineers in designing scalable infrastructure and adopting robust DevOps and SRE principles
• Collaborate with infrastructure, and ML teams to ensure the platform evolves to meet the needs of Reddit’s growing user base and diverse content ecosystem

Requirements:

• 10+ years of experience in software engineering, specializing in Indexing and Retrieval systems
• 3+ years in technical leadership, architecting and scaling distributed systems in production environments
• Deep expertise in large-scale data platforms, including batch indexing and stream processing
• Proven experience designing and operating large-scale, low-latency retrieval services
• Expertise in lexical and vector search retrieval technologies, such as Milvus, Vespa, or Elasticsearch
• Skilled in designing cloud-native architectures and managing containerized workloads using Kubernetes and AWS/GCP
• Adept at translating complex technical challenges into clear, actionable strategies
• Strong communicator and mentor who leads through collaboration, influence, and technical excellence