Senior Fullstack Developer (Next js, Supabase) - Full-time - LATAM/EMEA

We're looking to hire a senior full-stack engineer to take our B2B SaaS platform from a completed frontend prototype to a fully functional product. This is an immediate hire - we're ready to start this week.

What We've Built

A fully designed, production-quality frontend (10 pages) for an AI-powered automation platform serving DTC e-commerce brands. The UI is complete — we need someone to build the entire backend, AI systems, and integrations behind it.

What We Need Built

This is not a simple CRUD app. We're building an agentic AI platform with 7 core systems:

• AI-powered discovery engine — autonomous agents that find, score, and select prospects using web scraping + LLM evaluation
• Email infrastructure & warmup — multi-account sending, domain warmup, deliverability monitoring
• AI outreach sequences — LLM-generated personalized messaging adapted to recipient profiles
• AI reply processing — classify incoming replies, auto-route, generate context-aware responses with human approval
• E-commerce shipping integration — address collection, order creation, carrier tracking
• Analytics & reporting API — live metrics, ROI dashboards, data export, REST API for clients
• Learning database — system that improves recommendations and messaging from every interaction

Tech Stack

• Frontend (done): Next.js 16, React 19, TypeScript, Tailwind CSS
• Backend (to build): Next.js API Routes / Server Actions
• Database: Supabase (PostgreSQL + Auth + Storage + Realtime)
• AI: Claude API (Anthropic) for agentic workflows
• Integrations: Shopify API, email providers (Resend/SendGrid), Apify, carrier APIs, Stripe
• Infra: Vercel, background job processing (Inngest or Trigger.dev)

Candidate Requirements

Must-have:

• Expert in Next.js 14+ (App Router) + TypeScript
• Expert in Supabase/PostgreSQL with multi-tenant B2B architecture
• Strong experience with Claude/OpenAI API and agentic AI patterns
• Proven email infrastructure experience (warmup, deliverability, SMTP at scale)
• Background job pipelines (not just cron jobs)
• Shipped at least 1 AI-integrated SaaS product to production
• Stripe subscription billing

Nice-to-have:

• Shopify API / Shopify app development
• Web scraping (Apify, Playwright)
• Meta / Tiktok APIs
• Social media data APIs