Perplexity is seeking an experienced Software Engineer focusing on building the next-gen AI Foundation & Platform to help revolutionize the way people search and interact online. In this role, you'll help build Perplexity’s end-to-end AI data, evaluation and personalization infrastructure and flywheel which powers almost all agent products.Tech Stack: Spark | AWS Data Stack (S3, RDS, DynamoDB, Docker, EKS, Kinesis) | Pytorch | DynamoDB | Databricks | Snowflake | LLM APIsPerplexity is rapidly scaling both in number of use cases and number of users. Perplexity’s data stack powers scalable, personalized and fast answers for millions of people worldwide.ResponsibilitiesCollaborate closely with AI Product, Applied ML, Post-Training, and Data Science teams to design, build, and maintain scalable data pipelines and data lakesDevelop high-performance infrastructure that powers personalization features including memory, discover, and agentic productsCreate a scalable, multi-modal evaluation platform for all Perplexity AI products, including personalization, pro search, labs, deep research, and CometDesign tools and abstractions on foundational infrastructure to enhance personalization, analytics, recommendations, AI products, and post-training capabilitiesHolistically improve engineering foundation to support rapid growth of Perplexity products and international user base.QualificationsStrong programming and data engineering skills, with proficiency in open source & distributed framework(AWS, Spark, Flink, Iceberg, DynamoDB)Familiarity with cloud-based data services (e.g., AWS, RDS, DynamoDB), containerized infrastructure (e.g., EKS, Docker), and data streaming (Flink, Spark streaming, CDC)Strong quantitative and engineering skills with experience in estimating performance at high scaleExperience supporting various ML/AI engineering teams to build scalable frameworks to accelerate R&D for frontier models and AI productsExperience iterating on improving LLM responses and set up proper evaluation framework or Judges to analysis performance holistically.Self-motivated with a strong sense of ownership of systems and designs5+ years of industry experience in distributed systems or AI infrastructure