Cecilia Ziniti, who spent two decades as an in‑house lawyer at Amazon, Cruise, Anki and Replit, left Replit on 1 November 2023 to launch GC AI, a San Mateo‑based startup that applies generative artificial intelligence to corporate legal work. Early exposure to OpenAI’s GPT models while at Replit prompted Ziniti to identify gaps in the technology’s ability to meet the precision, citation and tone requirements of legal professionals.
Ziniti partnered with engineer Bardia Pourvakil, a former Replit colleague with a background in both law and software development, to build a suite of AI tools tailored for in‑house legal teams. The initial product was an AI assistant for corporate legal departments, later expanded to include contract‑analysis software priced by document volume and a platform for handling internal legal requests.
According to Ziniti, GC AI’s customer base grew from roughly 900 companies in early 2023 to about 2,100 a year later, a 400 % year‑over‑year increase. Clients span large enterprises and startups, including Lockheed Martin, Time, Eventbrite, Vercel and Gusto. Approximately 30 % of seats are used by non‑legal staff such as HR and finance executives.
The company emphasizes data security and trust, employing SOC 2 compliance, data‑isolation safeguards and a policy of not training its models on confidential client information. About one‑third of GC AI’s 125 employees are lawyers, and the firm reports that trust is the primary factor influencing corporate legal departments’ adoption of AI tools.
GC AI’s financing totals nearly $72 million across three rounds. The most recent round, a $60 million Series B closed in 2024, was co‑led by Scale Venture Partners and Northzone and valued the company at $555 million. Earlier investors include Sound Ventures, Aglaé Ventures, SilverCircle Partners, News Corp, The Council and a special‑purpose vehicle comprising roughly 45 general counsels.
Ziniti’s transition from corporate counsel to founder illustrates a growing trend of domain experts leveraging generative AI to create niche software solutions, pairing industry insight with technical partners to address specific enterprise needs.
