Data Analyst / ML Engineer

Location: Hybrid in Belgrade, Berlin, or London

Company

Perplexity develops search and answer systems supported by a multi-stage web crawling and storage infrastructure.

What you will do

• Find and diagnose quality issues across URL discovery, crawling, parsing, and indexing pipelines.
• Train small machine learning models to optimize pipeline components such as parsing quality.
• Build model-training datasets, including LLM-as-a-judge labeling pipelines.
• Improve page selection algorithms used for indexing.
• Design and analyze experiments to validate system improvements.

Requirements

• 4+ years of experience as a data analyst, ML engineer, or in a related role.
• Strong coding skills and the ability to write production-grade code at a mid-level backend engineering standard.
• Experience designing metrics from scratch.
• Experience training machine learning models that shipped to production and produced measurable metric improvements.

Nice to have

• Direct experience with web crawling or indexing pipelines.