Founding Engineer / CTO (£140k + Equity) at Ambient AI startup founded by ex-Stripe and Plaid leaders

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Job Title

Founding Engineer / CTO

Salary

£140k + Equity

Company Description

Ambient AI startup founded by ex-Stripe and ex-Plaid leadership

Job Description

Join as a technical co-founder to build ambient AI that assists professionals during high-stakes conversations. You will tackle gnarly challenges like sub-second latency and intent forecasting while architecting an unobtrusive Electron-based UX. This is a 0-1 opportunity to define the engineering culture and technical foundation for a next-generation productivity platform.

Location

London, UK

Why this role is remarkable

• Leadership pedigree: Work directly with founders from Stripe, Google Pay, and Plaid who understand how to scale world-class products.
• Deep technical ownership: You aren't just building features; you are making foundational architectural decisions on low-latency inference and real-time transcription pipelines.
• High-impact product: Build "calm tech" that moves beyond the chat box, providing sub-second intelligence that respects user attention during live calls.

• Architect and build the end-to-end product, from the low-latency ML infrastructure to the minimal-overhead Electron front-end.
• Develop a rapidly queryable context layer that integrates cross-platform data to provide real-time relevance during live conversations.
• Set the engineering culture and standards, balancing high-craftsmanship iteration with a relentless bias toward shipping and learning.

• Proven experience shipping production software from 0-1, with a track record of building high-quality products end-to-end.
• Deep technical expertise in at least one core area: retrieval/graph data structures, voice/transcription pipelines, or ML infrastructure.
• High-agency operator with a bias for action who knows when to choose the right abstraction and when to ship a duct-tape version.

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.

Next steps

Step 1. Visit the job listing.

Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/founding-engineer-cto-140k-equity-at-ambient-ai-startup-founded-by-ex-stripe-and-d0713bc1-6c56-415d-becd-2000656cdac5?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_d0713bc1-6c56-415d-becd-2000656cdac5

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.

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.