Senior Frontend Developer (AI Writing Platform)

Jobspage; Greater London; On-site; GBP 51,272 - 102,545; Part time

Job summary

Agathon is hiring an experienced front-end developer to lead the UI for our AI-assisted writing platform. You will turn UX wireframes into production-ready React components and collaborate with a small team including backend engineers to deliver polished interfaces for desktop use.

The role focuses on building chat-like interfaces, multi-step flows, and real-time feedback for AI outputs. It is a part‑time, fully remote position with flexible hours and UK/US time overlap.

Qualifications

• 4+ years of React experience with hooks and modern state management.
• Proven track record building chat/conversational interfaces.
• Experience with complex modal systems and multi-step user flows.
• Strong understanding of front-end performance optimisation.

Responsibilities

• Convert UX wireframes into pixel‑perfect React components.
• Implement best practices for LLM interface design (history, streaming, error handling).
• Manage state across complex user flows.
• Optimize performance for real-time AI interactions.

Skills

React

TypeScript

Tailwind CSS

State management

UI performance

Tools

Go

Python

REST APIs

Job description

Imagine an AI writing assistant developed by a speechwriter with deep experience in executive communications, designed to solve many of the problems traditional LLMs face when generating thought leadership.

This wouldn’t be just another ChatGPT wrapper—it would be an agentic, structured AI built specifically for high-level strategic writing.

We're seeking an experienced, senior front-end developer to join our startup building the future of writing with AI. You'll be the front-end lead working closely with one other full stack developer, turning UX wireframes into polished, production-ready interfaces aimed at desktop users.

What you’ll build:

• Sophisticated chat interfaces for LLM interactions with proper state management
• Complex modal systems and multi-step user flows
• Real-time feedback mechanisms for AI model outputs
• Intuitive prompt engineering tooling and creative writing interfaces
• Responsive, accessible UI components that handle edge cases gracefully

What you’ll own:

• Converting UX wireframes into pixel‑perfect React components
• Implementing best practices for LLM interface design (conversation history, streaming responses, error handling)
• State management across complex user flows
• Performance optimisation for real‑time AI interactions
• Collaboration with backend APIs (Go/Python stack)

Must‑haves:

• 4+ years React experience with modern hooks, context, and state management
• Proven track record building chat/conversational interfaces
• Experience with complex modal systems and user flow retention
• Strong understanding of front‑end performance optimisation
• Portfolio showing clean, intuitive UI design execution.

Huge plus:

• Previous work on LLM/AI interfaces (ChatGPT‑style, creative tools)
• Experience with streaming data and real‑time updates
• Understanding of creative writing workflows
• Startup experience in fast‑moving, small teams

Tech Stack:

React, TypeScript, Tailwind CSS, integrating with Go/Python backend

This is a part‑time (initially 20 hours/week), fully remote role with potential for growth. You'll have direct impact from day one in a lean, focused team working directly with our target users (a dozen or so creative writers).

Our team is spread across UK and US ET timezones, you will need to attend occasional meetings typically scheduled afternoon UK / morning ET. Salary for this role is $50-$100 per hour, but flexible for the right person.

Our interview process is composed of:

• Initial application review of your CV, portfolio and your relevant experience
• Phone screen and short code review exercise to help us understand more about you, your skills and and help you learn more about the project
• Tech test and review with our design/engineering team (3-6 hours, take‑home project)
• Final interview with our CEO and tech lead.