Senior Frontend Engineer for AI Interface (Real-Time React)

CDL Labor Logistics; West Palm Beach (FL); On-site; USD 140,000 - 160,000; Full time

Benefits offered by this job

Equity

Hybrid work across the U.S.

Health, dental, and vision coverage

Job summary

Harnham is seeking a Senior Frontend React Developer (AI Interface) to own the web experience for our real-time AI platform in West Palm Beach, onsite. You will build a fast, elegant frontend that translates AI data streams into a natural conversational UI, using React, WebSockets, and modern tooling.

Join a design-conscious team shaping human–AI interaction with performance-minded engineering. Expect 5+ years of frontend experience, strong React and JavaScript skills, and collaboration with

Qualifications

• 5+ years of professional frontend development experience with a strong focus on React.
• Deep expertise in JavaScript (ES6+), HTML5, and CSS3.
• Strong understanding of React architecture and modern state management patterns.
• Proven experience building real-time web applications using WebSockets.
• Proficient in RESTful API integration and asynchronous data handling.
• Familiarity with Microsoft Azure and cloud deployment workflows.
• Portfolio demonstrating ability to build clean, beautiful, and intuitive user interfaces.
• Genuine interest in AI, conversational interfaces, and human–computer interaction.
• Bachelor’s degree in Computer Science or a related field, or equivalent hands-on experience.

Responsibilities

• Architect & Develop the Frontend: Lead the development of a modern React-based application, making architectural decisions to ensure scalability and maintainability.
• Build Real-Time AI Experiences: Implement a live conversational interface integrating with backend services via WebSockets for streaming audio, transcriptions, and AI responses.
• Manage Complex State: Leverage modern React Hooks and state management solutions to handle authentication, conversation history, and live AI session states.
• Collaborate on UI/UX: Work closely with designers and product managers to translate wireframes and prototypes into pixel-perfect, responsive, and emotionally intelligent interfaces.
• Optimize for Speed & Performance: Profile and optimize for rendering performance across devices and browsers to ensure a smooth real-time user experience.
• Write High-Quality Code: Deliver clean, maintainable, and well-documented code following modern testing and review practices.

Skills

React

JavaScript

HTML5

CSS3

WebSockets

REST APIs

Azure

TypeScript

Real-time UI

Education

Bachelor’s degree in CS or related field

Tools

Framer Motion

Jest

React Testing Library

Azure Static Web Apps

Job description

Harnham is seeking a Senior Frontend React Developer (AI Interface) to own the web experience for our real-time AI platform in West Palm Beach, onsite. You will build a fast, elegant frontend that translates AI data streams into a natural conversational UI, using React, WebSockets, and modern tooling.

Join a design-conscious team shaping human–AI interaction with performance-minded engineering. Expect 5+ years of frontend experience, strong React and JavaScript skills, and collaboration with