AI - Fullstack Developer

Senior AI Full Stack Engineer | LLMs & Agentic Systems AI Startup · Tel Aviv District, Israel (Hybrid) We're looking for a Senior AI Full Stack Engineer to join a fast-growing AI startup revolutionizing how global enterprises manage knowledge, train employees, and improve performance through intelligent, AI-powered experiences. The company recently completed a significant Series A funding round and already serves 300+ paying customers , including leading Fortune 50 and Fortune 500 companies. Founded by a successful serial entrepreneur with over 20 years of experience building and leading companies, the startup combines strong business traction with cutting-edge AI innovation. The engineering team is building sophisticated AI Agents, Multi-Agent Systems, advanced RAG architectures, LLM-powered applications, and intelligent workflows , with plans to explore Supervised Fine-Tuning (SFT). We're looking for a strong, product-oriented engineer with proven hands-on experience building AI Agents in production , who can take full ownership of complex AI-native features, from architecture and development to real-world deployment. This is an opportunity to shape the next generation of AI-native products while taking real ownership over architecture, engineering, and product development. What You'll Do Build complex, AI-native Full Stack applications from architecture to production. Design, develop, and deploy production-grade AI Agents, Multi-Agent workflows, and LLM-powered features . Develop scalable backend services using Node.js and interactive frontend experiences using React . Solve advanced challenges involving Agent orchestration, tool calling, RAG, context management, and AI reliability . Lead features end to end, from technical design through deployment and continuous improvement. Influence key architectural and product decisions in a small, highly technical team. Requirements 5+ years of hands-on software engineering experience. Strong hands-on Backend development experience with Node.js - mandatory. Strong hands-on Frontend development experience with React - mandatory. Proven personal experience building and deploying AI Agents in production environments - mandatory. Strong understanding of Agentic Workflows, tool calling, orchestration, and integrations. Experience designing and developing complex, production-grade software systems. Strong system design skills and deep software engineering fundamentals. Proven ability to own and deliver features end to end. Strong product mindset, independence, and high ownership. Strong Advantages Experience building complex LLM-powered systems and advanced RAG architectures. Familiarity with MCPs, Agent Evaluation, observability, state management, and failure handling. Experience developing B2B SaaS products. Background in early-stage startups or building products from scratch. Experience working closely with Product and Design teams. 📍 Tel Aviv | Hybrid Only relevant applications will be considered.