Mid/Senior Product Engineer (£90,000–£130,000 + Equity) at Versey

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Job Title:

Mid/Senior Product Engineer

Salary:

£90,000–£130,000 + Equity

Company Description:

Versey – $3m pre-seed AI startup backed by 8VC and Sequoia scouts

Job Description:

Join a high-craft team building the "Cursor for writing." You will develop a local-first, minimalist editor that serves as a thinking partner for serious writers. Using Next.js and LangGraph, you'll solve complex challenges in real-time AI collaboration, agent orchestration, and seamless syncing to empower journalists and researchers worldwide.

Location:

London, UK

Why this role is remarkable:

  • Build a category-defining tool designed with 50+ professional writers and journalists to augment, not replace, human thought.
  • Join an elite team recognized in Focal’s 2024 top 1% of European startups, backed by Tier-1 investors like 8VC and Venrex.
  • Work in a high-ownership environment with a founder who has two prior successful exits and a passion for high-craft engineering.

What you will do:

  • Engineer a high-performance, local-first writing interface using TypeScript, Tailwind v4, and ProseMirror for an elite user experience.
  • Architect sophisticated agentic workflows using LangGraph and modern reasoning models to create an integrated, context-aware AI writing partner.
  • Collaborate directly with customers to define and ship end-to-end features, from inline AI suggestions to complex version tracking systems.

The ideal candidate:

  • Professional experience building complex frontend applications with React/Next.js and a deep obsession with interaction quality and craft.
  • Strong interest or experience in local-first architecture and integrating LLMs/agentic systems into production-ready software products.
  • A generalist mindset with excellent product instincts who appreciates high-quality tools like Linear, Superhuman, or Notion.

#J-18808-Ljbffr”, “datePosted”: “2026-03-13”, “hiringOrganization”: { “@type”: “Organization”, “name”: “Jack & Jill/External ATS”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__388188875__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=33” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }
Company: Jack & Jill/External ATS
Apply for the Mid/Senior Product Engineer (£90,000–£130,000 + Equity) at Versey
Location: London
Job Description:

Job Title:

Mid/Senior Product Engineer

Salary:

£90,000–£130,000 + Equity

Company Description:

Versey – $3m pre-seed AI startup backed by 8VC and Sequoia scouts

Job Description:

Join a high-craft team building the “Cursor for writing.” You will develop a local-first, minimalist editor that serves as a thinking partner for serious writers. Using Next.js and LangGraph, you’ll solve complex challenges in real-time AI collaboration, agent orchestration, and seamless syncing to empower journalists and researchers worldwide.

Location:

London, UK

Why this role is remarkable:

  • Build a category-defining tool designed with 50+ professional writers and journalists to augment, not replace, human thought.
  • Join an elite team recognized in Focal’s 2024 top 1% of European startups, backed by Tier-1 investors like 8VC and Venrex.
  • Work in a high-ownership environment with a founder who has two prior successful exits and a passion for high-craft engineering.

What you will do:

  • Engineer a high-performance, local-first writing interface using TypeScript, Tailwind v4, and ProseMirror for an elite user experience.
  • Architect sophisticated agentic workflows using LangGraph and modern reasoning models to create an integrated, context-aware AI writing partner.
  • Collaborate directly with customers to define and ship end-to-end features, from inline AI suggestions to complex version tracking systems.

The ideal candidate:

  • Professional experience building complex frontend applications with React/Next.js and a deep obsession with interaction quality and craft.
  • Strong interest or experience in local-first architecture and integrating LLMs/agentic systems into production-ready software products.
  • A generalist mindset with excellent product instincts who appreciates high-quality tools like Linear, Superhuman, or Notion.

#J-18808-Ljbffr…

Posted: March 13th, 2026