Product Builder - Fintech

As a Product Builder in the Acquiring domain, you'll take end-to-end ownership of initiatives: framing the problem in a short design document, prototyping a solution, demoing to peers and stakeholders, shipping to production, and staying close enough to see whether it actually helped.

The surface area is broad: payment acceptance (authorization, capture, refunds, disputes), the payment-facilitator layer (sub-merchant data, identifiers, card scheme compliance), acceptance expansion across markets, and reporting into our ledger.

You'll work in a small domain team with no management layer in between. The tribe's Product Manager and Staff Engineer help with direction where relevant, but you won't be waiting for it. You'll set scope, run experiments, make calls, and run what you build.

Hospitality payments are at an inflection point. Hotels want payments that are embedded, transparent, and cheaper to run, and the gap between what exists and what's possible is real. Product Builders in Fintech close that gap.

What you would do

Take end-to-end ownership of product initiatives in Acquiring: defining the problem, prototyping the solution, shipping to production, and iterating based on real customer feedback.

Design and implement the systems that power card and alternative payment acceptance, the payment-facilitator layer, and reporting to ledger.

Leverage AI to ship faster, set the standard for how it is used in the development process across the tribe, and build reusable approaches that accelerate other domains.

Establish reusable patterns and frameworks that accelerate the work of other Product Builders, and coach those who want to develop in this direction.

AI Fluency Level 3: In this role, AI is a core part of how you build, not an add-on. You have redesigned how you or your team works with tools like Claude, Cursor or agent frameworks, and you have built approaches that other engineers now follow. You also question what the AI gives you: you check the code and the payment logic it produces and know when it is wrong, which matters most in a domain where correctness comes first.

For more information on AI fluency at Mews, please refer to "AI Fluency at Mews: A Comprehensive Guide for Candidates" on Confluence.

What you would bring

Seven or more years delivering customer-facing software with measurable business outcomes, including large-scale initiatives across functions, systems, or product areas.

Hands-on experience using modern AI tooling such as Claude, Cursor, or agent frameworks as a core part of how you build, with enough understanding to make sound engineering decisions.

Experience integrating a payment service provider or acquirer at scale: APIs, webhooks, idempotency, and reconciliation.

Strong product instincts: you care about the problem as much as the implementation, and you’ve made product calls without waiting on a dedicated Product Manager or Designer.

Nice to have

Experience in a startup, founder or scale-up environment

Working knowledge of the card payment lifecycle: 3DS/SCA, IC++ pricing, chargebacks and

PCI DSS scope

Experience in a regulated financial environment (EMI, payment institution): audit trails, PII

handling

Spain

€57.000—€90.500 EUR

Czechia

1 191 500 Kč—2 042 000 Kč CZK

UK

£62,500—£106,500 GBP