Sitefire is an AI agent-specific marketing suite solution launched in March 2026 through the Y Combinator (YC W26) batch. Co-founders Jochen Madler and Vincent Jeltsch, leveraging their background in reinforcement learning and optimization research at the Technical University of Munich (TUM) and Stanford University, established the company. It supports the automation and analysis of Generative Engine Optimization (GEO), a key paradigm in the era of AI-powered search. This platform goes beyond traditional text-matching-based search engine optimization and helps monitor, in real-time, the context and frequency with which a specific brand is recommended in major large language models (LLMs) and AI search services such as ChatGPT Search, Gemini, Claude, and Perplexity, and secures citations. Traditional SEO methods, which rely on Google's PageRank algorithm or simple keyword density to improve search rankings, have limitations in conversational search environments where AI agents combine and summarize information to provide answers. To overcome these limitations, Sitefire adopts a unique architecture that analyzes the internal multi-query expansion process of AI in response to user-entered natural language questions and traces back the source pages cited in the actual answers. Just as companies in the past tried to list their information as reliable references in encyclopedias during the printing era, Sitefire is a precision-guided digital marketing system designed to ensure that large generative AI models prioritize a company's digital assets as top URLs when constructing reliable answers. As information exploration through AI agents becomes mainstream in the fields of biotechnology research and digital healthcare, the value of this tool is increasing. For example, when a biotech company providing gene analysis technology or new drug development solutions targets academic researchers and decision-makers in the medical field, it can analyze the high-engagement technical keywords entered into AI search engines and optimize its academic materials to be directly cited in the answers provided by Perplexity or Gemini. Furthermore, by identifying specific threads in community-oriented user-generated content (UGC) such as Reddit or YouTube that AI frequently references for summarization and automatically recommending optimal agentic actions, Sitefire helps companies build the best off-page paths to establish themselves in the AI's trusted domain, rather than engaging in meaningless keyword advertising competition.

Sitefire is an AI-powered Marketing Suite solution, launched in March 2026 as part of the Y Combinator (YC W26) batch. It was founded by co-founders Jochen Madler and Vincent Jeltsch, who leveraged their research background in reinforcement learning and optimization from the Technical University of Munich (TUM) and Stanford University. Sitefire supports the automation and analysis of Generative Engine Optimization (GEO), a key paradigm in the era of AI-powered search.