Principal Frontend Architect for AI-Powered UIs

Harnham; Oakland (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Harnham is seeking a hands-on Principal or Senior Frontend Engineer to help build the next generation of AI-powered product experiences on top of large-scale knowledge systems and domain-specific datasets. This role blends frontend engineering with AI-driven UX, product development, and platform architecture.

You will design, build, deploy, and iterate on intelligent applications that leverage LLMs, retrieval, search, and AI copilots, owning the full user experience.

Qualifications

• Experience building AI-powered frontend apps with React/TypeScript.
• Strong understanding of design systems and accessibility.
• Ability to own end-to-end frontend features from concept to production.

Responsibilities

• Design and build AI-native frontend experiences that help users discover, consume, and interact with information.
• Develop frontend applications integrating LLMs, semantic search, recommendations, and AI copilots.
• Create highly performant React and TypeScript applications used by large audiences.
• Build rich interfaces that surface AI-generated insights, recommendations, summaries, and workflows.
• Partner with design, product, data, and engineering to validate concepts and ship capabilities.
• Architect reusable frontend systems, design patterns, and shared component libraries.
• Influence frontend strategy, technical direction, and product architecture.
• Improve performance, reliability, accessibility, observability, and UX across the platform.

Skills

React

TypeScript

Next.js

HTML5/CSS3

Frontend testing

Design systems

Tools

REST APIs

GraphQL

CI/CD

Job description

Harnham is seeking a hands-on Principal or Senior Frontend Engineer to help build the next generation of AI-powered product experiences on top of large-scale knowledge systems and domain-specific datasets. This role blends frontend engineering with AI-driven UX, product development, and platform architecture.

You will design, build, deploy, and iterate on intelligent applications that leverage LLMs, retrieval, search, and AI copilots, owning the full user experience.