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Senior Software Engineer (AI Feature Development)

Pasona N A, Inc.

Irvine · Hybrid Full-time Senior $120k – $135k/yr 2w ago

About the role

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)

Skills

BunDockerKubernetesLangChainNode.jsReactRustTypeScriptVercel AI SDK

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