Jack & Jill/External ATS - Mid/Senior Product Engineer (£90,000–£130,000 + Equity) at Versey
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Requirements
• 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. • Who are Jack & Jill? • 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. • 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. • Step 1. Visit our website https://jackandjill.ai/jack/job-listing?utm_source=job_listing&utm_medium=job_board&utm_campaign=39da31b8-5000-4acf-b6ce-730fd6d7a9e3. • Step 2. Click 'Talk to Jack'. • Step 3. Talk to Jack so he can understand your experience and ambitions. • Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. • Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. • Step 6. If not, Jack will find you excellent alternatives. All for free. • We never post fake jobs • This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. • We appreciate this can make them look a bit suspect, but there isn't much we can do about it. • Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
Responsibilities
• 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.
Benefits
• Company Description: Versey - $3m pre-seed AI startup backed by 8VC and Sequoia scouts • 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.
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