Principal Engineer - AI Platform

iHerb Inc.; California, Northern (MO, KY); Hybrid; USD 204,000 - 260,000; Full time

Job summary

iHerb Inc. seeks a Principal Engineer to guide AI platform architecture and set engineering standards across teams. You will lead hands-on delivery of production AI systems, shape the GenAI product layer, and ensure scalable, guardrailed AI practices.

You will mentor senior engineers, collaborate with product, data science and security, and drive architecture reviews to align multiple teams with iHerb’s AI SDLC golden path.

Qualifications

• AI-driven SDLC tools and guardrails.
• Experience designing large-scale distributed systems across teams.
• Leadership of platform initiatives spanning multiple teams.

Responsibilities

• Define and own the AI platform architecture across the org.
• Lead development of shared AI platform layer used by AI features.
• Mentor engineers and drive architecture reviews and standards.

Skills

AI-driven SDLC

Architecture at scale

Cross-org leadership

Engineering quality mindset

Communication & influence

Distributed teams (US, China, LATAM)

Production AI platform systems

LLM evaluation

MLOps in production

Agentic systems frameworks (LangChain,

GenAI in production

Education

Bachelor’s Degree in Computer Science or related

Tools

LangChain

LlamaIndex

Claude Code

GitHub Copilot

Cursor

Job description

For A Better You

At iHerb, we believe that living a healthy and balanced life should be easy and accessible to everyone. As a team member, we’ll empower you to live this promise each day as you make a truly global impact in your career. We constantly strive for innovation, while transforming and improving the online shopping experience for our customers. We believe that individually we are incredible, but when we come together, our growth is infinite. In an industry that is constantly evolving, we are on a mission to make an impact on the global market, and the individual and collaborative efforts of our people are paramount to helping us succeed. Whether you work in one of our logistics centers, technology hubs, corporate offices or even from home, your role at iHerb will take you beyond what’s expected, turning challenge into change. If you're ready for it, we want you to join our team.

Job Summary:

The Principal Engineer operates at the intersection of deep technical execution and broad organizational influence. This role will resolve the hardest architectural questions, set the AI-native engineering bar, and ensure that iHerb's platform decisions compound over time rather than accumulate debt. Reporting to the VP of Engineering this role collaborates closely with peer Principals, Engineering Managers, and peer VPs across the organization.

Job Expectations:

• Define and own the AI platform architecture: retrieval infrastructure, model lifecycle, evals framework, guardrails, and GenAI product feature design.
• Lead the build of the shared AI platform layer consumed by all AI product features and reusable by internal business teams.
• Hands-on contributor: build production AI systems, write proofs of concept, and validate architecture through working software.
• Set and enforce technical standards for the AI Platform team; drive architecture reviews and model quality reviews.
• Coordinate with the Personalization team to define clear boundaries between the GenAI product layer and existing ML personalization infrastructure.
• Contribute AI platform-specific patterns and lessons into iHerb's shared AI-driven SDLC golden path.
• Drive the hardest cross-cutting technical decisions across multiple teams and shared platform services.
• Establish and evolve iHerb's AI-driven SDLC golden path: shared standards, Claude Code skills, guardrails, and automation patterns.
• Lead complex multi-team technical efforts by coordinating architecture reviews, aligning peer Principals and EMs, and resolving competing approaches.
• Mentor and raise the technical bar across the engineering organization through code review, architecture review, and direct coaching of senior engineers.
• Represent engineering in cross-functional conversations with product, data science, security, and infrastructure.
• Feed architectural decisions into the shared knowledge base so institutional knowledge compounds across the organization.

The duties and responsibilities described above may provide only a partial description of this position. This is not an exhaustive list of all aspects of the job. Other duties and responsibilities not outlined in this document may be added as necessary or desirable, with or without notice.

Knowledge, Skills and Abilities:

Required:

• AI-driven SDLC (required): demonstrated use of AI-assisted development tools such as Claude Code, GitHub Copilot, or Cursor to ship production systems. Can articulate workflow changes, quality tradeoffs, and guardrail strategies.
• Architecture at scale: experience designing and evolving large-scale distributed systems across multiple teams and years: APIs, data pipelines, event-driven architectures, or high-traffic platforms.
• Cross-org technical leadership: track record of driving architectural standards, technical roadmaps, or platform initiatives that span multiple teams or organizations.
• Engineering quality mindset: deeply held opinions on code quality, observability, CI/CD, test automation, and maintaining velocity without accumulating hidden debt.
• Communication and influence: able to write clear architecture documents, present to technical and non-technical audiences, and build consensus without formal authority.
• Experience working in distributed teams across the US, China, and Latin America.
• Production experience designing and operating AI platform systems: RAG pipelines, vector search, embedding infrastructure, or retrieval-augmented applications at scale.
• Hands-on experience with LLM evaluation: building eval frameworks, defining quality metrics, and iterating on model and prompt quality using data.
• MLOps experience: model deployment, monitoring, lifecycle management, and cost governance in a production environment.
• Experience building and operating agentic systems using frameworks such as LangChain, LlamaIndex, or equivalent.
• GenAI in production is required; prototype or research-only experience is not sufficient at this level.
• High degree of accuracy and attention to detail
• Excellent organization skills and ability to multi-task

Equipment Knowledge:

• Experience with Microsoft Office Suite (Word, Excel, PowerPoint)
• Experience with Google Business Suite (Gmail, Drive, Docs, Sheets, Forms) preferred

Experience Requirements:

Generally requires a minimum of 10+ years of software engineering experience, with a significant portion at senior, staff, or principal IC level.

Education Requirements:

Bachelor’s Degree in Computer Science or related field preferred, or a combination of education and equivalent work experience.

Judgment/Reasoning Ability:

Able to identify, troubleshoot and resolve problems quickly using sound judgment, poise and diplomacy. Ability to use judgment and reasoning skills, and determine when to elevate issues, as required, in a timely manner.

Physical Demands:

The physical demands described here are representative of those that must be met by a Team Member to successfully perform the essential functions of this job. While performing the duties of this job, the Team Member is regularly required to talk and hear. The Team Member is frequently required to sit, walk, climb stairs, use hands and fingers, bend, stoop and reach with hands and arms. Reaching above shoulder heights, below the waist or lifting as required to file documents or store materials throughout the work day. The Team Member may occasionally lift or move office products and supplies up to 25 pounds. Proper lifting techniques required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Work Environment:

• Hectic, fast-paced with multi-level distractions
• Professional, yet casual work environment
• Office / Warehouse environment
• Ability to work extended hours as required

Compensation:

The expected salary range for this role is $204,000.00 - $260,000.00 USD. The actual base pay offered will be determined by factors such as the candidate's relevant experience, education, geographic location, and internal equity.