Pasona N A, Inc.
Job Description
Senior Software Engineer (AI Feature Development) Location: Irvine, CA 92618 Work Style: Hybrid (3 days/week in office) Work Hours: 9:00 AM – 6:00 PM (flexible) Salary Range: $120,000 – $135,000 base Experience Level: 5–10 years Work Authorization Requirement : Due to company policy, we are unable to provide visa sponsorship now or in the future. Candidates must be legally authorized to work in the United States on a permanent basis. Applicants requiring visa sponsorship cannot be considered. Overview We are seeking a versatile Senior Full-Stack Software Engineer with a strong passion for building AI-first products . This role blends traditional full-stack engineering with modern AI development. You will own the full lifecycle of AI-powered features—from prompt engineering and LLM integration to API and frontend development—delivering scalable, production-ready solutions with an exceptional user experience. You will play a key role in bridging cutting-edge AI technologies with real-world, enterprise-grade software. Key Responsibilities End-to-End Feature Ownership: Design, develop, and deploy features (including AI-driven functionality), taking ownership across the entire stack—from intuitive front-end interfaces to robust back-end systems. AI-Powered System Architecture: Build and maintain scalable, production-ready architectures that integrate Large Language Models (LLMs) into core product workflows. AI Implementation & Optimization: Implement and refine AI pipelines using modern orchestration tools (e.g., LangChain, Vercel AI SDK) and prompt-engineering techniques to ensure high-quality outputs. Full-Stack Engineering Excellence: Develop high-performance APIs and web services using modern TypeScript-based stacks, ensuring seamless data flow and an excellent user experience. Rapid Prototyping & Iteration: Operate effectively in a fast-paced, ambiguous environment by translating high-level AI concepts into functional, scalable software. Cloud-Native Operations: Deploy, manage, and optimize containerized services to ensure reliability, performance, and scalability of AI-driven applications. Required Qualifications 5–10 years of experience in web, backend, or full-stack development Proven experience designing, building, and operating production systems Hands-on experience developing or integrating AI / LLM-based features Strong ability to learn, adapt, and work with evolving technologies and architectures Comfortable working in fast-moving, ambiguous product environments All candidates must be authorized to work in the United States. Unfortunately, visa sponsorship is not available, now or in the future. Nice to Have Experience with modern TypeScript stacks (React, Node.js, Bun, etc.) Experience with containerized or cloud-native systems (Docker, Kubernetes, etc.) Experience with AI development frameworks (Vercel AI SDK, LangChain) Emerging / Planned Technologies Rust (for performance-critical and reliability-sensitive components)