You will build a high-performance, local-first writing editor designed as a thinking partner for serious writers. Working with a founder who has two prior exits, you'll bridge the gap between human creativity and AI agents. This role focuses on high-craft interactions, agentic workflows with LangGraph, and sophisticated text-editing interfaces.
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Mid/Senior Product Engineer at Versey
We're building Cursor, but for writing. Join an elite London-based team recognized as one of the 100 hottest startups in Europe. As a Product Engineer, you will build a high-craft, local-first platform using Next.js and LangGraph, shipping features that define the future of human-AI collaboration. If you have deep product taste and love tools like Linear and Superhuman, this is your chance to shape the next great writing interface.
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This role is no longer actively hiring, but Jack can still help you discover similar open roles that fit.
Location
London, United Kingdom
Compensation
£90k-£130k + EMI Options
Company
Versey
Role overview
Software
Versey helps you develop and articulate your ideas, and by design avoids watering down your style.
Craft clear, persuasive writing with AI. Most writing tools optimise for speed. Versey is built for people who care about clarity, judgment, and the quality of the thinking on the page.
Our users are professionals who publish regularly —on Substack, in essays, on blogs, or through long-form audio and video.
It learns from you — your past writing, notes, conversations, and working drafts — to build an understanding of how you think and make decisions. The goal is not to imitate your voice, but to support it.
What you will do
- Design and implement AI-native editor interactions including inline suggestions, version tracking, and structured agentic "Skills."
- Build and refine a high-performance local-first editor with live collaboration features between human users and autonomous AI agents.
- Orchestrate complex agentic workflows using LangGraph and modern reasoning models to help writers explore ideas and research more effectively.
Who this is a fit for
- Possesses strong JavaScript fundamentals and a deep obsession with interaction quality found in tools like Linear, Notion, and Superhuman.
- Brings experience with text editing frameworks such as ProseMirror or Tiptap, alongside a solid understanding of local-first architecture and syncing.
- Demonstrates strong product instincts and the ability to ship features end-to-end, from initial idea to production-ready agentic systems.
Why this role is remarkable
- Join a top 1% Focal European startup recognized as one of the 100 hottest startups by the Europa awards, backed by investors like 8VC (Asana) and Venrex (Revolut).
- Build "Cursor for writing," creating an AI-native tool that respects the writer's process rather than flattening their voice through generic automation.
- Work in a small, elite team of experienced generalists in a high-ownership environment where craft, taste, and interaction quality are the primary North Stars.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Versey wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.