TheirStack is a critical data provider for the burgeoning AI agent ecosystem, specifically for sales and market research agents. Because AI agents require high-quality, structured inputs to generate relevant content or take autonomous actions, TheirStack's API provides the 'eyes' that these agents need. An AI agent tasked with lead generation can use TheirStack to monitor job postings for specific tech stack changes, providing the context necessary for the agent to draft a hyper-personalized email or technical proposal.
By sitting at the data layer of the agent stack, TheirStack enables 'signal-based' autonomy. Rather than a human telling an agent to 'find leads,' a developer can set up a trigger where the agent activates only when TheirStack detects a specific hiring event or technology adoption. This makes it an essential tool for companies building automated B2B workflows where the goal is to match software solutions to companies that have just signaled an internal need.
B2B sales has historically relied on firmographics—static data like industry codes and employee counts—to segment markets. TheirStack operates on the premise that these markers are too blunt for modern software sales. Instead, the company focuses on what businesses are actually doing: who they are hiring and what tools they are asking those new hires to use. By aggregating millions of job postings across 195 countries, they turn the unstructured text of a job description into structured technographic data.
Based in A Coruña, Spain, TheirStack was founded in 2022 by Xoel Barata and Christian Palou. The founders recognized that job boards represent one of the few places where companies are explicitly honest about their internal operations and future plans. A job post for a 'Snowflake Data Engineer' is a high-confidence signal that a company is an active Snowflake user, while a post looking for an 'Invoice Management Specialist' signals a specific business process that might be ripe for automation. This is a level of detail that traditional web scraping of a homepage rarely provides.
The platform's primary value is its ability to bypass the manual effort of maintaining web scrapers. Their marketing—'Don’t bother scraping, we’ve done it for you'—targets developers and sales ops teams who have grown tired of managing fragile scrapers for Greenhouse, Lever, or LinkedIn. By providing a clean API for job posting data and technographic lookups, they allow teams to build automated workflows that trigger when a target account starts hiring for a relevant role. The service tracks over 32,000 technologies, ranging from common CRMs to niche database frameworks.
In the competitive market of sales intelligence, TheirStack differentiates itself by focus. While platforms like ZoomInfo or Apollo provide broad contact databases, TheirStack specializes in the intent layer. They have found a specific niche within the 'Modern Sales Stack,' primarily through a deep integration with Clay. Users often use TheirStack to pull a list of companies using a specific technology and then use Clay to find the specific decision-makers at those firms. This combination allows for highly personalized outreach that references the prospect's actual tech stack.
The shift toward signal-based selling represents a departure from the 'spray and pray' methods of the last decade. In that era, the goal was volume; today, the goal is timing. TheirStack is built for the latter. By indexing 5.3k specific technologies as filters, they allow a company selling a security tool for Kubernetes to find exactly when a prospect starts building out a DevOps team. This is not just about knowing a company uses a tool; it is about knowing the exact moment their needs are changing. The company remains small, with a team of fewer than ten people, yet they track 168 million jobs, demonstrating how specialized data providers can compete with legacy giants through focus and API accessibility.
Access millions of global job postings through a single API for market and technographic analysis.
TheirStack is hiring.