Founding Engineer ($120K - $300K + Equity) at Y/n

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Founding Engineer Salary $120K - $300K + Equity Company Description $14M Sequoia and Kleiner Perkins backed interactive storytelling startup Job Description Join a high-growth consumer platform reaching #4 in the App Store with only three employees. You will own the full-stack architecture and personalized recommendation infrastructure serving 2T tokens monthly. This is a rare opportunity to build the future of entertainment alongside founders from Substack and world-class AI researchers in San Francisco. Location San Francisco, USA Why this role is remarkable Exceptional traction with 100K+ teenagers spending 3+ hours daily in-app and 40% MoM growth in user engagement. Elite pedigree working directly with the founding designer of Substack and a CTO who trained the world's first image-editing AI. Massive technical scale serving over 200 million user messages per month with a lean, world-class engineering team. What You Will Do Take end-to-end ownership of the core app surface and critical product features used by millions of global users. Design and scale personalized recommendation systems to handle high-concurrency traffic and massive token distribution. Architect and maintain robust infrastructure that goes far beyond simple deployments to support complex, interactive story engines. The ideal candidate Proven track record of building and scaling production infrastructure rather than just managed deployments. Previous experience in a high-growth startup environment or a portfolio of deeply technical and meaningful side projects. A genuine passion for fandom, reading, or fanfiction culture to help shape the next century of digital storytelling. 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. How does this work? 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 it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives. 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. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. 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. Show more Show less