Principal Software Engineer, AI Email Applications, Artificial Intelligence (AI) Required - Work From Home

Principal Software Engineer, AI Email Applications, Artificial Intelligence (AI) Required - Work From Home As the Principal Software Engineer, AI Email Applications, you own the engineering layer that turns Artificial Intelligence (AI) capability into a reliable product. You will shape the architecture across backend services, APIs, and client applications, while leading a small team of senior engineers. This is a hands-on leadership role. You stay close to the code, make critical architectural decisions, and ensure the system remains fast, reliable, and coherent as it scales. This position is 100% Remote. MUST BE WILLING TO TAKE A 60 MINUTE CODING ASSESSMENT. Principal Software Engineer Responsibilities: - Own the application engineering strategy and execution across backend, mobile, and desktop. - Design reliable systems for AI-powered workflows, including state, orchestration, tool use, retries, fallbacks, and failure handling. - Build the APIs and abstractions that connect Artificial Intelligence (AI) systems to real-world product experiences. - Lead a small, senior engineering team and raise the technical bar through design reviews, code reviews, and hands-on mentorship. - Make high-impact trade-offs across latency, reliability, cost, security, and user experience. - Establish strong production foundations: observability, monitoring, testing, and operational excellence. - Partner closely with Machine Learning (ML) leadership to turn model capabilities into robust, shippable product experiences. - Move quickly while keeping the architecture simple, maintainable, and ready to scale. Principal Software Engineer Outcomes: - Production systems are observable, monitored, and stable under real-world load. - Decisions consistently balance speed, cost, reliability, and user experience. - Features across backend, mobile, and desktop work smoothly and reliably. - Latency and reliability improve measurably over time. Principal Software Engineer Qualifications: - Artificial Intelligence (AI) experience is required. - Significant experience leading application or product engineering for complex systems. - Strong hands-on background building and shipping backend systems used in production. - Experience building AI-powered products or systems that integrate with modern Machine Learning (ML)/Large Language Model (LLM) capabilities. - Strong technical judgment and the ability to make decisions with incomplete information. - Comfortable working across backend and client platforms, with deep expertise in at least one. - A strong bias toward ownership, shipping, and learning from real-world usage. - High standards for code quality, reliability, and engineering fundamentals. Benefits include medical insurance, Dental, Vision, Savings Plan Options, PTO, etc. Keywords: San Francisco CA Jobs, AI, Artificial Intelligence, AI Email Applications, APIs, Backend, Desktop, IT Lead, LLM, Large Language Model, ML, Machine Learning, Mobile, Principal Software Engineer, Work From Home, Remote, California Recruiters, IT Jobs, California Recruiting Looking to hire a Principal Software Engineer in San Francisco, CA or in other cities? Our IT recruiting agencies and staffing companies can help. We help companies that are looking to hire Principal Software Engineers for jobs in San Francisco, California and in other cities too. Please contact our IT recruiting agencies and IT staffing companies today! Please check out all of our jobs at www.nextstepsystems.com.