Senior Full Stack Developer (Vinci AI)

Company: Spendbase

Vinci AI is building AI agents for customer support that act, not just answer.
We're launching from inside a hundred-million-dollar scale-up with a clear ambition: build the next unicorn in customer support. Most AI support tools reply to tickets. Vinci acts - resolves them, escalates with full context when needed, learns from every interaction, and turns support from a queue into an automated operating layer.
We're looking for a Senior Full-Stack Engineer who wants ownership from day one and the chance to shape a category-defining product from the ground up.
What You'll Do
* Own meaningful parts of our full-stack architecture - from idea to shipped product
* Make sharp technical and product decisions, working closely with the founders
* Build and improve our AI/LLM integrations at the product layer
* Move fast, iterate often, and take real responsibility for what you ship
What We're Looking For
* Senior full-stack experience with strong ownership mentality
* Strong TypeScript experience across the stack: React/Next.js, Node.js/Fastify, PostgreSQL, Redis, and background job systems such as BullMQ
* Strong product mindset - you care about outcomes, not just code
* Genuine passion for AI and building products people actually use
Nice To Have
* Experience with Drizzle ORM, pgvector, or vector/RAG-based systems
* Experience building auth, permissions, and multi-tenant SaaS systems
* Experience with support, helpdesk, CRM, or ticketing integrations such as Zendesk, Intercom, Freshdesk, Salesforce, or HubSpot
* Experience shipping LLM-powered product features: tool calling, evaluations, observability, prompt/version management, or AI agent workflows
What We Offer
* Competitive salary based on experience and results, plus meaningful stock options for exceptional candidates
* 24 paid vacation days + paid sick leave
* Fully remote work with flexible hours
* A culture of real ownership - your ideas get heard, your impact gets seen
* The opportunity to build something meaningful at an early-stage company with big ambitions
Ready to build something category-defining? Join Vinci AI 🚀

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