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

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Job Title

Founding Engineer / CTO

Salary

£140k + Equity

Company Description

AgentBay is a London-based startup building the trust layer for agentic commerce. Founded by alumni from Stripe, Plaid, and Amazon, they are developing a first-of-its-kind risk engine and payment infrastructure to protect consumers and merchants as AI agents begin to handle autonomous transactions and financial decisions.

Job Description

As the Founding Engineer/CTO at AgentBay, you will build the technical foundation for autonomous agentic commerce. You’ll develop a novel risk engine quantifying "alignment risk" using ML and LLMs, integrate complex payment flows, and design end-user UX. This is a hands-on role defining a new category alongside seasoned fintech and big-tech founders.

Location

London, UK

Why this role is remarkable

• Join as a founding team member with a direct line to strategy and the chance to define a brand-new category in the AI and fintech space.
• Work alongside founders with elite pedigrees from Amazon, Google Pay, Stripe, and Plaid who have scaled massive systems and launched successful products.
• Solve "alignment risk," one of the most critical hurdles for the future of agent-led commerce, building infrastructure that doesn't exist anywhere else today.

• Architect and build a first-of-its-kind risk engine from scratch using a blend of traditional supervised learning and LLM-as-a-judge methodologies.
• Develop and embed secure risk harnesses within agentic commerce protocols and payment flows, partnering with ecosystem players to integrate bleeding-edge technology.
• Lead the end-to-end product engineering cycle, from backend machine learning models and payment orchestration to crafting high-craftsmanship, "calm tech" user experiences.

• A senior-level engineer who has shipped complex production software end-to-end, ideally with experience taking a product from 0-to-1 in a fast-paced environment.
• Deep technical expertise in either machine learning infrastructure or payment systems, with the architectural maturity to make sharp decisions under conditions of high uncertainty.
• A high-agency, low-ego builder who values product velocity and craftsmanship, possesses the UK right to work, and enjoys a high-energy, collaborative startup culture.

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How does this work?

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