Second (second.dev) is an AI-native enterprise codebase maintenance platform founded by YC W23 alumni. The company initially targeted commodity web application feature creation but pivoted after extensive customer discovery to focus exclusively on automating codebase migrations and upgrades, a problem that consumes roughly 50% of engineering time at large companies. The platform works by connecting an AI agent to a GitHub repository. Users select a migration module (each hand-built for a specific transformation), run it, and receive a pull request with the completed changes. Under the hood, the agents combine AI, codemods, proprietary codebase scanners, and dependency resolvers to perform directory restructuring and code changes at scale. Supported migration types include: AngularJS v1 to React 18, Angular to newer Angular versions, Enzyme tests to React Testing Library, JavaScript to TypeScript, Next.js version upgrades, and similar framework or tooling transitions. Each module is purpose-built rather than generic, which gives the agent more reliable output on the specific transformation pattern. Second targets enterprise engineering teams dealing with legacy codebase debt. The company had raised $1.9M and was working with multiple large enterprises as of its YC launch period. Repository access starts free for codebases up to 1MB, with paid tiers for larger projects. The co-founder/CTO subsequently moved to a new YC company (Wayline, S25), which introduces some uncertainty about current team composition and product trajectory. Key features: - GitHub integration: connects agent directly to your repository and opens a PR with migration changes - Hand-built migration modules for specific transformations (AngularJS to React, JS to TypeScript, Enzyme to RTL, Next.js upgrades) - Proprietary codebase scanners and dependency resolvers built into each module - Combines AI with traditional codemods for reliable, deterministic output on known migration patterns - Free tier for repositories up to 1MB; paid tiers for larger enterprise codebases - Focuses exclusively on codebase maintenance and upgrades, not general-purpose feature development
Free for repositories up to 1MB; Pro/enterprise plans available (exact pricing not public)