HUMAN Security is looking for a seasoned, strategic Senior Fullstack Engineer to help shape the future of our work in Agentic AI. This critical role involves end-to-end development of advanced client and server features, handling large-scale data, aggregations, and cutting-edge UI/UX design. You will work on mission-critical technologies, collaborating with engineering, design, and data science teams to deliver impactful solutions. Responsibilities: * Design and implement scalable fullstack architectures using React and Node.js. * Develop and maintain high-performance services and data pipelines, managing large-scale data aggregations. * Collaborate with cross-functional teams - including product, design, and research - to integrate and ship new features. * Troubleshoot complex production issues and optimize system performance. * Champion secure coding practices and clean code standards. Qualifications: * 5+ years of production experience in both React and Node.js. * Deep familiarity with React Hooks, React-Query, and Express. * Experience building and maintaining distributed systems or high-throughput architectures. * Experience with AI-assisted workflows (e.g., Cursor, Copilot, LLMs) and integrating AI features. * Strong problem-solving skills and the ability to work independently in a fast-paced, dynamic environment. * Experience working with SQL and NoSQL databases. * Familiarity with Go (Golang) and cloud-based platforms is a plus. Desired Skills: * Experience with Agentic AI and related technologies. * Knowledge of cybersecurity threats and vulnerabilities. * Familiarity with cloud-based platforms and architectures. * Prior experience working in a high-growth or late-stage startup environment. About HUMAN Security HUMAN was founded in a Brooklyn sci-fi bookstore with a hacker mindset and the lofty mission of making the internet safer by putting humans first. Today, our Human Defense Platform safeguards enterprises from sophisticated bots, fraud, and account abuse, verifying the humanity of more than 20 trillion interactions per week for the world’s biggest brands and internet platforms. HUMAN is an equal opportunity workplace dedicated to protecting the internet's integrity for everyone. We believe in putting people first, embracing diversity of thought from our global teams, and welcoming all individuals to share their unique experiences as we fight cybercrime together. We support our Humans with a comprehensive total rewards package for personal and professional development, including well-being and learning stipends, flexible work options, and dedicated time off. While our HQ is in NYC, we have teams worldwide. HUMAN is growing fast, and there’s never been a more meaningful time to join us. If you thrive on solving complex problems and want to help shape the future of cybersecurity, join us as we build a safer, more human internet. If you are an individual with a disability or special need that requires accommodation, please contact us directly.