G2

G2 operates the world's largest B2B software marketplace, a platform built on peer reviews and user-generated ratings that help businesses discover, compare, and purchase software. Founded in 2012 and headquartered in Chicago, with offices in London and Bengaluru, the company has accumulated more than 1.3 million user reviews across categories spanning CRM, ERP, HR, CAD, PDM, and marketing software. It has raised more than $250 million in funding and is valued at over $1 billion.

The engineering work behind the marketplace spans several distinct problem areas: online marketplace infrastructure, review and ratings systems, software category management, and data aggregation and insight generation. Two products anchor the platform: the G2 Marketplace, where buyers browse and compare software solutions, and the G2 Reviews Platform, which collects and surfaces authentic reviews from verified users.

Scale is central to the data challenges the company faces. Alongside sister properties Capterra, SoftwareAdvice, and GetApp, G2's combined properties hold 6 million verified reviews and draw more than 200 million annual visitors. Ranking, aggregation, and quality signals across that volume of unstructured user input form the technical core of the business.