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Payment Operations Engineer

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Quona Capital
Full Time position
Listed on 2026-10-19
Job specializations:
  • Software Development
    Backend Developer
Salary/Wage Range or Industry Benchmark: 64000 - 94000 GBP Yearly GBP 64000.00 94000.00 YEAR
Job Description & How to Apply Below
Location: Greater London

Payment Operations Engineer

Customer-Facing
· Remote, Europe, Africa or Asia

About Caliza

Caliza is commercial banking infrastructure for companies that operate across borders. Most global businesses still piece together several banks, FX providers and spreadsheets to move money. Caliza replaces that with one platform and API: hold USD accounts, collect and pay in 33+ currencies, and convert between fiat and stable coins, over local rails, SWIFT or stable coins, in minutes instead of days. On top of that, we’re building the treasury layer: programmable accounts, approval policies, automated reconciliation and working capital, run by a customer’s finance team or their AI agents.

Our customers are importers, exporters, FX brokers, payment companies and fintechs across the Americas, Europe, Africa and Asia. We’re licensed and regulated across our core markets, and our team has built financial infrastructure at Visa, Nubank, EBANX, Flutterwave, Upstart, Intuit and Silicon Valley Bank.

Our backers

Initialized Capital, Better Tomorrow Ventures, Abstract Ventures, New Form Capital, QED Investors, Valor Capital and Quona Capital, along with the founders of Flutterwave, Chipper Cash, Rappi, Pomelo, Dock, Remesa Online and Anchorage.

About the role

Caliza moves money across fiat payment rails in the Americas, Europe and Asia, including Fedwire, ACH, SPEI, SEPA and CNAPS, as well as blockchains. Most payments flow through automatically. When one doesn't, our customers need someone who can work out exactly what happened, explain it clearly, and get it resolved.

That's this role. When a customer asks "where's my payment?", you'll own the answer. You'll follow the payment from their API call, through our internal systems and ledger, out to our partner banks, the payment rail or the blockchain, and back. Then you'll explain what you found to the customer, push the bank for answers when needed, and hand our engineers a precise problem when something is genuinely broken.

You don't need to be an expert in every system a payment touches, but you need to be able to follow one through all of them. You're comfortable reading logs, querying a database and decoding a bank message, and equally comfortable explaining what you found to a customer, a bank or an engineer. You'll build a deep understanding of how our rails really behave over time;

we'll teach you the Caliza-specific parts.

Location: Europe, Africa, or Asia. You'll be based there so customers get help during their working hours, but the role covers every rail we operate, not just the ones in your region. Professional English required.

In your first six months, you'll
  • Learn how payments flow through Caliza end to end, across fiat rails and stable coins.
  • Within three months, understand all of our rails well enough to handle most customer payment issues on your own, whichever rail they're on.
  • Own customer payment investigations during your hours, across every rail, keeping customers informed from first message to resolution.
  • Write runbooks for the issues you see most, so the rest of the team can rely on them.
  • Build at least one tool or automation that measurably reduces manual work.
What you'll be doing
  • Be the technical point of contact for customers with payment problems, especially when the answer isn't obvious.
  • Answer technical API questions from live customers, such as failed webhooks, error codes or unexpected payment statuses. Helping new customers integrate before launch is handled separately by engineering.
  • Trace payments across our API, internal systems, ledger, partner banks, rails and blockchain to find where things stand and what happens next.
  • Tell expected behavior from a real bug, and ...
  • Work with partner banks and providers on investigations, returns and…
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