Overview About FullStack: FullStack is the most transparent IT talent network, connecting highly skilled individuals with top general companies and Silicon Valley startups for remote, on-demand projects. We focus on building a trusted, high-performance network where talent can thrive in a positive, respectful, and supportive environment. By prioritizing transparency, fair opportunities, and professional growth, we empower our engineers to deliver their best work while collaborating with innovative teams worldwide. - Offering life-changing opportunities for talented software professionals across the Americas. - Enhancing highly-skilled software development teams of hundreds of the world’s greatest companies. - Our 4.2-star rating on GlassDoor. - Our client Net Promoter Score of 68, twice the industry average. The Opportunity Join our talent network and connect with U.S. clients for flexible, project-based development work as a Senior AI Agent Engineer. - You will integrate directly into our client/'s team and work alongside their existing designers and engineers on a daily basis. What We/'re Looking For - 5+ years of professional software development experience. - 3+ years of experience building production-ready AI applications, with a proven track record of deploying LLM-based agents and conversational systems. - Advanced English is required. - Successful completion of a four-year college degree is required. - Proven experience deploying production-grade systems using OpenAI, Claude, or Gemini, with a deep understanding of prompt engineering and model behavior. - Hands-on experience building autonomous agents or complex chatbots using frameworks like LangChain, OpenAI Assistants API, or CrewAI. - Practical experience with AI voice platforms such as Vapi, Retell, or Twilio to build real-time conversational systems. - Strong mastery of Python (FastAPI/Flask) for building scalable APIs and handling asynchronous processes. - Solid experience with data