David Hayashi

Senior Full-Stack Engineer with 9+ years of professional experience designing, developing, and deploying scalable web applications, AI-powered products, and enterprise software solutions. Strong expertise across modern frontend and backend ecosystems, with deep hands-on experience in React, Next.js, TypeScript, JavaScript, Node.js, Python, Django, MongoDB, Redux, and Tailwind CSS.
Experienced in Generative AI and Large Language Model (LLM) development, including designing AI-powered applications, building e-commerce chatbots, preparing and
processing large datasets, developing training pipelines, integrating language models into production applications, and creating conversational AI experiences.
Strong background in full software development lifecycle, including system architecture, technical design, API development, database architecture, frontend engineering, AI
integration, testing, performance optimization, deployment, and production support.