Founding Engineer / CTO (£140k + Equity) at ZATAR AI

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Job Title

Founding Engineer / CTO

Salary

£140k + Equity

Company Description

ZATAR AI is a London-based startup founded by ex-Stripe and ex-Plaid leaders building ambient AI to help professionals navigate high-stakes conversations. The team is developing sub-second latency intelligence that surfaces critical context from CRMs and past docs during live calls, creating a seamless "calm tech" experience for elite professionals.

Job Description

Join ZATAR AI as a Founding Engineer/CTO to build a sub-second latency ambient AI product from the ground up. You will own the technical architecture—from low-latency inference systems to a minimalist Electron interface—defining the product's future alongside founders with pedigree from Google, Stripe, and Plaid in a high-velocity, London-based environment.

Location

London, UK

Why this role is remarkable

• Build the technical foundation of a company led by founders with senior backgrounds at Stripe, Google Pay, JPMorgan, and Plaid.
• Solve deep technical challenges in real-time "calm tech," moving beyond standard chat boxes to innovate with sub-second latency ambient intelligence.
• Secure a significant founding equity stake and the authority to shape the engineering culture and product roadmap from day zero.

What You Will Do

• Architect and build the end-to-end product, including a low-overhead Electron surface and the high-performance systems running underneath.
• Develop and optimize low-latency inference models and conversational intelligence pipelines to forecast intent and emotional shifts during live calls.
• Design and maintain a rapidly queryable context layer that synthesizes data from CRMs and documents to provide real-time, relevant assists.

The ideal candidate

• Proven track record of shipping 0-1 production software, with deep expertise in retrieval, graph data structures, or voice/transcription pipelines.
• High-agency builder who makes sharp architectural decisions with imperfect information and prioritizes product velocity without sacrificing high craftsmanship.
• Technical leader with low ego who thrives in a collaborative, high-debate environment and values the intensity of a hybrid, 3 days/week office culture.

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.