Seif Eddine S.

With 5+ years of full-stack experience and 20+ shipped products, I specialize in building AI-powered SaaS applications from zero to launch. Whether you're starting with a rough idea or need an experienced hand to take a prototype to production, I own the entire build. What I build? -LLM-powered SaaS products, Custom AI applications built on OpenAI, Claude, or Gemini, with streaming, memory, and tool use. -AI agents & multi-agent workflows, Autonomous systems that browse, reason, retrieve, and take action using LangChain, LlamaIndex, or raw APIs. -RAG & knowledge systems, Document Q&A, semantic search, and internal knowledge bases powered by vector databases. -AI-enhanced backends, Real-time streaming APIs, webhook pipelines, and scalable infrastructure that won't buckle under load. -High-converting landing pages, Fast, pixel-perfect pages built with Next.js, optimized for Core Web Vitals, SEO, and conversion. Ideal for SaaS launches, product waitlists, and marketing campaigns. -Full-stack web apps & MVPs, Classic products built fast, clean, and ready to grow. Tech stack? -AI / LLM: OpenAI API, Anthropic Claude, LangChain, LlamaIndex, Pinecone, pgvector, Gemini. -Landing pages & frontend: Next.js, Framer Motion, Wix, Wordpress, Tailwind CSS, Core Web Vitals, React, Angular. -Backend: NestJS, Node.js, Express. -Database & cloud: PostgreSQL, MongoDB, Supabase, Firebase, AWS, Vercel, Shopify.