A solo founder from Ethiopia has secured a swift exit for his developer tools start-up after Vercel, the US-based cloud platform, acquired Better Auth, an open-source authentication library that has become a cornerstone for artificial intelligence start-ups.
The deal, announced on Monday, comes barely a year after Better Auth raised a $5m seed round from investors including Peak XV Partners, Y Combinator, P1 Ventures and Chapter One. Financial terms of the acquisition were not disclosed.
Better Auth was built and scaled almost single-handedly by Bereket Engida, a self-taught programmer who began coding at 18 in his bedroom in Addis Ababa. The TypeScript library, which lets developers embed sign-in, role management and password resets directly into their applications without relying on external services, has grown rapidly since its 2024 launch. Weekly downloads on the npm registry have climbed from about 150,000 at the time of its fundraising to 4.7m today, and the project counts more than 850 open-source contributors.
Mr Engida and his small core team will join Vercel to continue leading Better Auth’s development, with a particular focus on “agent identity” — an emerging protocol for assigning separate, revocable digital credentials to autonomous AI agents that act on a user’s behalf. The library will remain free and open-source under the MIT licence, with community governance unchanged.
“When an agent acts on your behalf, it runs under your identity and access, so every service it touches sees you, not the agent,” Guillermo Rauch, Vercel’s chief executive, wrote in a blog post. “Agent identity is foundational to agentic infrastructure.” The technology will be integrated into Vercel Connect and eve, the company’s platform for managing AI workflows.
The acquisition underscores how rapidly the infrastructure needs of AI developers are reshaping the market for authentication tools. Established services such as Auth0, Firebase and NextAuth have faced criticism for rigidity and cost at a time when companies building AI applications want full control over user data and the flexibility to self-host. Better Auth answered that demand by enabling organisations to keep authentication logic and sensitive information inside their own databases, a feature that resonated especially with AI start-ups handling proprietary tokens and compliance-heavy workflows.
The speed of the exit is notable for a company led by a founder from outside the traditional hubs of venture-backed software. Mr Engida taught himself programming after a friend declined to help him build an e-commerce app. He later identified the gaps in authentication while working on freelance projects, and built the initial version of Better Auth from Ethiopia long before relocating to the US for Y Combinator’s spring 2025 batch. The accelerator has a history of backing solo technical founders, but Mr Engida became only the third Ethiopian entrepreneur to pass through its programme.
Investors who backed the $5m seed round had pointed to the grassroots adoption of Better Auth among start-ups in Peak XV’s own network as evidence of product-market fit. “Several start-ups we knew were already using the library organically — that is a strong signal,” Arnav Sahu of Peak XV said at the time. The decision to bet on a rare solo African founder in deep tech was both a commercial wager on a critical layer of the developer toolchain and a symbolic endorsement of globally distributed technical talent.
For Vercel, the acquisition adds a fast-growing authentication layer to a product suite built around the Next.js framework, which now powers millions of web applications. By bringing agent identity in-house, the company is positioning itself as a platform not just for traditional software, but for a coming wave of semi-autonomous AI agents that will need fine-grained permissions and the ability to be shut down individually without cutting off a user’s entire digital presence.
Mr Engida, who has remained heavily involved in coding and project direction said joining Vercel would allow the team to “accelerate the agent identity work without compromising the open-source principles that got us here.” The library’s community and documentation will continue to be maintained in the open.
The deal is among the most prominent exits for an African solo founder in infrastructure software, a segment long dominated by teams in Silicon Valley and Europe. It follows a broader trend of global investors scouring markets beyond the traditional venture centres for high-potential developer tools, a hunt fuelled by the conviction that the next generation of critical software may increasingly be written far from the established hubs.