Overview
Census built software that moved customer data from a company's warehouse into the applications employees used every day. A sales team, for example, could see a customer's product usage in its customer relationship management system instead of looking for it in a separate analytics report. This practice became known as reverse ETL: sending prepared data out of the warehouse rather than only loading data into it. Fivetran
Fivetran agreed to acquire Census in May 2025. The companies had worked on complementary parts of data movement: Fivetran loaded information into warehouses, and Census sent it back to business tools. The Census product continued within Fivetran as Activations. Fivetran
Image 1 / 1
Founding Story
Boris Jabes, Brad Buda, Anton Vaynshtok, and Sean Lynch began building Census in 2018. Buda later recalled the team asking whether they could do “Fivetran, but in reverse.” Jabes described seeing sales and marketing teams lack useful information about what customers were doing in their product. Buda · Mixpanel
The idea depended on an emerging ecosystem of cloud data warehouses and tools that loaded and transformed data. In a 2021 interview, Lynch said that early conversations could be difficult because the category had no widely understood name. His shorthand for Census was “Fivetran in reverse.” That explanation later became unusually literal when Fivetran bought the company. Sacra
Timeline
- 2018: The founders began with a reverse data movement prototype. Jabes
- February 2021: Census announced a Series A led by Sequoia; existing investor Andreessen Horowitz participated. a16z
- February 2022: Axios reported a $60 million round led by Tiger Global at a $630 million valuation, and annual recurring revenue above $2 million at that time. Axios
- May 2025: Fivetran announced an agreement to acquire Census for undisclosed terms, subject to closing conditions. Fivetran
- 2026: Fivetran's documentation described Census as integrated into Activations and announced a unified product experience. It set January 15, 2027 as the retirement date for the old API and workspaces. Fivetran migration FAQ
What They Built
Companies collect information in many products: a billing service knows payments, an application records feature usage, and a customer support system holds tickets. A data warehouse brings those records together for analysis. Census connected that prepared warehouse data to operating tools, such as a customer relationship management system or a marketing platform.
A data team selected a warehouse dataset, chose an application destination, mapped fields, and configured a synchronization. A sales representative could then see a product-usage signal beside the account they were already handling. The value was not merely copying a row: the company could reuse the definitions its data team maintained instead of rebuilding a separate customer view inside every application. Lynch interview · Fivetran Activations
The two directions of movement were related but not identical. Fivetran CEO George Fraser told TechCrunch that moving data into a warehouse and writing it back into applications involved different technical problems. Fivetran said it had built a prototype before deciding an acquisition was a better use of resources. TechCrunch
Market Position
Census sold to data teams whose warehouse was becoming the shared source for customer information. Its direct competitors included Hightouch and RudderStack, while customer-data platforms and in-house connectors addressed adjacent needs. The company was both complementary to Fivetran and exposed to a platform with the customer relationships and incentive to offer both directions of data movement. Sacra
Lynch noted that competitors helped establish reverse ETL as a category rather than just one company's product. The acquisition later combined an established ingestion platform with that reverse direction. This does not establish that Census could not have continued independently, or that any particular competitive pressure forced the sale.
Business Model
Census sold software subscriptions. Axios reported that it had just over $2 million in annual recurring revenue when it raised its 2022 round. Fivetran announced in 2025 that Census served hundreds of customers; both figures are time-specific and should not be treated as current results. Deal consideration and the return to investors were not disclosed. Axios · Fivetran
Outcome and evolution
Fivetran's May 2025 announcement was an agreement, not proof of closing on that date. Its later migration documentation states that Census joined Fivetran in 2025 and that Census capabilities became Fivetran Activations. The exact closing date is not established here. Fivetran announcement · Migration FAQ
The combined product now has common access controls and source-based navigation. The migration also has costs: Fivetran plans to retire the earlier Activations API and workspaces in January 2027, requiring affected customers to change integrations. The acquisition preserved the core capability while changing the surrounding operating model. Migration FAQ
Key Lessons
Census found a specific use for data that was already expensive to collect: put a modeled signal where a sales or marketing employee makes a decision. Its trajectory also shows how adjacent tools can become parts of one platform. The surviving Activations product and the migration requirements matter more to a prospective builder than treating the acquisition as an empty market.
Sources
Sources include a16z's investment account, Lynch's 2021 interview, Fivetran's announcement, and its migration FAQ.