Senior Frontend Developer (AI Writing Platform) in London

Senior Frontend Developer (AI Writing Platform) in London

London Part-Time 100 - 100 £ / hour (est.) Working from home possible
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At a Glance

  • Tasks: Lead front-end development for an innovative AI writing platform, creating user-friendly interfaces.
  • Company: Join a dynamic startup revolutionising writing with AI technology.
  • Benefits: Flexible part-time hours, fully remote work, and competitive pay.
  • Other info: Collaborate with a small, focused team across UK and US timezones.
  • Why this job: Make a real impact in the future of writing while working with cutting-edge tech.
  • Qualifications: 4+ years React experience and proven skills in building chat interfaces.

The predicted salary is between 100 - 100 £ per hour.

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 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.

Senior Frontend Developer (AI Writing Platform) in London employer: Agathon

Join a dynamic startup at the forefront of AI writing technology, where your contributions as a Senior Frontend Developer will directly shape innovative solutions for creative writers. Enjoy a flexible, fully remote work environment that fosters collaboration across UK and US time zones, while benefiting from opportunities for professional growth and a competitive hourly rate. Be part of a passionate team dedicated to redefining the future of writing with AI, where your expertise in React and user interface design will be valued and impactful.

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Contact Details:

Agathon Recruitment Team

StudySmarter Expert Advice🤫

We think this is how you could land Senior Frontend Developer (AI Writing Platform) in London

Join Local Coding Meetups

Get involved in local coding meetups or tech events. These gatherings are perfect for networking with other software engineers, showcasing your skills, and even getting a chance to meet potential employers face-to-face. Plus, it's a great way to learn about part-time opportunities that might not be widely advertised.

Contribute to Open Source Projects

Dive into some open-source projects on platforms like GitHub. This not only enhances your coding skills but also builds a solid portfolio that shows potential employers your real-world experience. Open-source contributions can lead directly to job offers since many companies scout talent in the community.

Utilise University Career Services

If you're in or near university, make the most of those career services! They often have connections with local tech companies looking for part-time developers and can provide valuable resources for finding job leads or prep for interviews.

Showcase Your Work

Build a personal website or portfolio that highlights your projects, skills, and any relevant experience. It’s a fantastic way to stand out and we encourage you to link to it in your applications. Don't forget: you can easily apply for part-time roles through our website at Agathon—just remember to include that link!

We think you need these skills to ace Senior Frontend Developer (AI Writing Platform) in London

React
TypeScript
Tailwind CSS
State Management
Performance Optimisation
UX Design
Chat Interface Development

Some tips for your application 🫡

Highlight Your Coding Skills:Make sure to prominently feature your coding skills in your CV. List the programming languages and technologies you're comfortable with, as well as any relevant projects you've worked on. Don’t forget to link to your GitHub profile or any other coding platform where you showcase your work – it's a great way for us at Agathon to see your skills in action!

Show Off Your Problem-Solving Skills:As a part-time software developer, problem-solving is key. In your application, try to include examples of how you've tackled tough coding challenges or bugs. If you can quantify your achievements, even better! This not only shows your technical prowess but also your ability to think critically and creatively.

Tailor Your CV for Part-Time Work:For a part-time role, it’s essential to show that you’re flexible and can manage your time well. Within your CV, highlight any previous experience balancing multiple commitments or projects. It’ll reassure us that you can juggle responsibilities without compromising on quality.

Craft Your Cover Letter with Passion:Your cover letter is your chance to show us your enthusiasm for software development. Share why you're excited about joining Agathon specifically, and what you hope to gain from this part-time role. Your motivation and eagerness to learn can really set you apart from the crowd!

How to prepare for a job interview at Agathon

Show Off Your Code

Make sure to prepare a few coding samples or projects to share during your interview for the part-time software engineering position at Agathon. Potential employers love to see tangible evidence of your skills, so having a well-organised GitHub profile or portfolio can really make you stand out.

Brush Up on Problem Solving

Expect a few technical questions or coding challenges that assess your problem-solving abilities. Companies like Agathon often want to see how you think through a problem, so practise common algorithms and data structures to showcase your thought process and technical know-how.

Know Your Tools

Familiarise yourself with the specific programming languages and tools relevant to the role. If the job listing mentions languages like Python or JavaScript, make sure you can discuss your experience with them confidently. Knowing frameworks and libraries they use can give you an edge.

Highlight Your Flexibility

Since this is a part-time position, be ready to discuss how you can manage your time effectively and fit the role around your other commitments. Being able to demonstrate your adaptability and proactivity shows that you can balance work, study, or other responsibilities without dropping the ball for Agathon.