Fullstack Engineer

At Inflection AI, our public benefit mission is to harness the power of AI to improve human well-being and productivity. The next era of AI will be defined by agents we trust to act on our behalf. We’re pioneering this future with human-centered AI models that unite emotional intelligence (EQ) and raw intelligence (IQ)—transforming interactions from transactional to relational, to create enduring value for individuals and enterprises alike. Our work comes to life in two ways today: Pi, your personal AI , designed to be a kind and supportive companion that elevates everyday life with practical assistance and perspectives. Platform — large-language models (LLMs) and APIs that enable builders, agents, and enterprises to bring Pi-class emotional intelligence into experiences where empathy and human understanding matter most. We are building toward a future of AI agents that earn trust, deepen understanding, and create aligned, long-term value for all. About the Role As a Fullstack Engineer (Backend Frontend) at Inflection, you will own the platforms, systems, and user-facing experiences that bring our conversational AI to life at scale. You’ll work across the stack—from designing resilient backend services and distributed systems to building intuitive, high-performance frontend applications. You will collaborate closely with research, product, design, and infrastructure teams to enable rapid iteration, high reliability, and secure delivery of novel AI features to millions of users. Your work will directly impact both the pace of product development and the stability and usability of our production systems. What You’ll Do Backend Engineering Design and implement scalable backend systems and APIs that power production LLM experiences, including agentic workflows, memory systems, and tool integrations. Architect and operate high-availability infrastructure to support real-time inference, retrieval, and conversation pipelines. Build distributed systems and asynchronous workflows for AI-driven features and external integrations. Ensure high standards for performance, reliability, and security through load testing, monitoring, automation, and incident response. Participate in on-call rotations to maintain the reliability of the services you build. Frontend Engineering Develop performant, accessible, and responsive web applications that power conversational AI experiences. Build reusable UI components and design systems using modern frontend frameworks (e.g., React, TypeScript, Nodejs, Tailwind). Integrate frontend applications with complex backend APIs, streaming responses, and real-time data pipelines. Partner with product and design teams to prototype, test, and iterate quickly on new AI-powered features. Optimize frontend performance, observability, and user experience at scale. Platform Productivity Develop internal platforms to improve engineering productivity—CI/CD pipelines, service templates, observability frameworks, and rollout tooling. Collaborate with applied research to productionize experimental AI systems into robust, user-ready features. What We’re Looking For 8+ years of professional software engineering experience with strong hands-on experience in both backend and frontend development. Proven experience designing and scaling backend systems (APIs, distributed systems, asynchronous workflows). Strong proficiency across the modern web stack: Python, TypeScript, Node.js, and modern frontend frameworks (e.g., React, Tailwind). Experience building complex frontend applications with attention to performance, UX, and maintainability. Experience integrating AI/LLM-powered systems into production applications. Familiarity with modern cloud infrastructure and workflow tooling, including orchestration frameworks (e.g., Temporal), containerization and Kubernetes, and CI/CD pipelines on AWS/GCP/Azure. Strong problem-solving, collaboration, and communication skills. Experience in high-growth or ... (truncated, view full listing at source)