
Yosef M.
Web Developer and AI Engineer
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Portfolio
Werkervaring
Web Developing and AI Engineering
Upwork • Freelance
Jul 2026 - Present • 0 mos
Full-Stack Developer & AI Engineer Build production web applications and AI-powered tools end-to-end—from UI to backend to the AI layer itself. Comfortable owning a project from spec to deployment rather than just one slice of the stack. What I've built: • Designed and shipped full-stack apps using React.js, Next.js, Python/FastAPI, and MongoDB, handling everything from data modeling to responsive Tailwind CSS interfaces. • Built memory-enabled chatbots using Claude/GPT APIs combined with mem0 and LangChain so conversations retain context across sessions instead of resetting each time. • Developed Document AI pipelines with RAG (LlamaIndex, Haystack, Pinecone/FAISS) that let users query large document sets in plain language and get accurate, sourced answers. • Architected a multi-agent research and outreach automation system (LangGraph/CrewAI) that autonomously finds leads, researches them, and drafts personalized outreach—cutting manual research time significantly. • Set up no-code/low-code automation flows (n8n, Zapier) for clients who needed AI capability without a full dev team. Approach: I test ideas by building working prototypes first, then refine based on what actually holds up—not just what looks good on paper. Clients get something they can click through and evaluate, not just a proposal.