Senior Full-Stack Developer | Short Contract (4 weeks, remote) AI-native B2B SaaS

Senior Full-Stack Developer | Short Contract (4 weeks, remote) We're building an AI-native B2B SaaS platform and need an experienced full-stack developer to connect existing mock UIs to real data. The frontend is built, the designs are done. This is about wiring everything up properly. This is an AI-native codebase. Claude Code is the primary development tool, not an afterthought. We're looking for someone who already works this way: using AI to write, scaffold, and review code as a matter of course, not as a novelty. If that's not how you work, this isn't the right contract. The work: Connect mock UIs to live API calls across multiple user dashboards Integrate Clerk authentication with correct role-based access (5+ distinct user personas) Work within an established Next.js 16 / TypeScript monorepo (Turborepo) Query and shape data from MongoDB Maintain existing component library (shadcn/ui, Radix UI) You must have: 3+ years writing strict TypeScript, naturally, not reluctantly Next.js App Router fluency: RSC, Server Actions, middleware MongoDB: schema design, aggregation pipelines, indexing Auth: JWT, session management, claims-based access control Genuine hands-on AI development experience, Claude Code specifically preferred Self-directed: you will be working closely with a solo founder, not a dev team Strong plus: Vercel AI SDK v4, streaming, tool use Recharts or similar Railway deployment Important: You will do a short live technical screen before engagement. Applications from agencies or teams will not be considered. We need the person doing the work to be the person we speak to.