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Principal Frontend Engineer

Job in Oakland, Alameda County, California, 94616, USA
Listing for: Harnham
Full Time position
Listed on 2026-09-01
Job specializations:
  • Software Development
    Front End Developer, AI Engineer (Applied/Software), React.js, Full Stack Developer
Salary/Wage Range or Industry Benchmark: 140000 - 190000 USD Yearly USD 140000.00 190000.00 YEAR
Job Description & How to Apply Below

We are 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 is ideal for someone who enjoys operating at the intersection of frontend engineering, AI-powered user experiences, product development, and platform architecture. You'll work closely with technical leadership to design, build, deploy, and iterate on intelligent applications that leverage large language models, retrieval systems, recommendations, search, and AI-assisted workflows.

This is not a pure UI implementation role. We are looking for builders who can take ideas from concept to production, own the full user experience, and thrive in a fast-moving, high-ownership environment.

What You'll Do
  • Design and build AI-native user experiences that help users discover, consume, and interact with information more effectively.
  • Develop frontend applications integrating LLMs, semantic search, recommendations, and AI copilots.
  • Create highly performant React and Type Script applications used by large audiences.
  • Build rich interfaces that surface AI-generated insights, recommendations, summaries, and workflows.
  • Partner closely with design, product, data, and engineering teams to rapidly validate concepts and ship new capabilities.
  • Architect reusable frontend systems, design patterns, and shared component libraries.
  • Influence frontend strategy, technical direction, and product architecture.
  • Continuously improve performance, reliability, accessibility, observability, and user experience across the platform.
Key Responsibilities AI-Powered Product Experiences
  • AI copilots and assistants
  • LLM-powered user interfaces
  • Conversational experiences
  • AI-assisted workflows
  • Search and discovery experiences
  • Recommendations and personalization
  • AI evaluation and user feedback loops
  • Prompt and interaction design
Frontend Architecture
  • React and Type Script application architecture
  • Component systems and design systems
  • Micro-frontends (where appropriate)
  • Performance optimization
  • Accessibility and responsive design
  • Testing and frontend quality frameworks
  • Frontend observability and monitoring
  • Rapid prototyping and experimentation
  • A/B testing frameworks
  • Collaboration with product and design
  • End-to-end feature ownership
Desired Technical Experience Frontend
  • React
  • Type Script
  • Next.js
  • HTML5 / CSS3
  • Frontend testing frameworks
  • Design systems and component libraries
AI / ML Integration
  • OpenAI, Anthropic, Gemini, or similar models
  • AI-powered applications
  • RAG-powered user experiences
  • Semantic search systems
  • Recommendations and retrieval systems
  • AI copilots and assistants
  • Prompt engineering and AI workflow design
  • AI evaluation and feedback systems
  • Python, Node.js, or similar backend technologies
  • Django, FastAPI, Express, or related frameworks
  • REST APIs
  • GraphQL
  • Data integrations
Infrastructure
  • AWS
  • Docker
  • CI/CD
  • Frontend deployment pipelines
  • Monitoring and observability platforms
Data
  • Redis
  • Search platforms
  • Analytics platforms
  • Event tracking and experimentation systems
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