Principal Frontend Engineer — AI-Powered UX

Harnham; San Francisco (CA); Hybrid; USD 250,000 - 350,000; Full time

Job summary

Harnham is seeking a Principal Full Stack Engineer (Frontend) to lead the development of AI-powered product experiences in a hybrid Bay Area setting. You will own features from concept to launch, shaping scalable frontend and backend services and collaborating with cross-functional teams.

The role emphasizes building high-performance React/TypeScript interfaces, developing Python APIs, and delivering AI-powered capabilities such as intelligent search and recommendations.

Qualifications

• Proven frontend experience with React/TypeScript in production.
• Backend API development with Python and cloud-native architectures.
• Experience integrating AI/LLM capabilities into products.

Responsibilities

• Build polished, high-performance product experiences using React, TypeScript, and modern frontend technologies.
• Develop backend APIs and services using Python, cloud-native architectures, and modern data platforms.
• Create AI-powered features including intelligent search, recommendations, summarization, and conversational experiences.
• Partner closely with Product and Design to transform complex workflows into intuitive user experiences.
• Own features end-to-end, from architecture and implementation through launch and iteration.

Skills

React

TypeScript

Python

AWS / Cloud

LLMs integration

Product-minded

Ownership

Tools

AWS

Python APIs

Job description

Harnham is seeking a Principal Full Stack Engineer (Frontend) to lead the development of AI-powered product experiences in a hybrid Bay Area setting. You will own features from concept to launch, shaping scalable frontend and backend services and collaborating with cross-functional teams.

The role emphasizes building high-performance React/TypeScript interfaces, developing Python APIs, and delivering AI-powered capabilities such as intelligent search and recommendations.