Senior Backend Engineer - Payments

SPD TechnologyPayment infrastructure

Workable locations: Ukraine. Poland. Spain. Portugal. Romania. Georgia, 4–6 hours of daily overlap with US Central Time is requiredFull-TimeSenior

Salary not disclosed

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Job Details

Languages: Strong English communication skills
Experience: 6+ years of professional software engineering experience; at least 3 years of hands-on experience with payment systems or payment processing.
Required Skills: Node.jsTypeScriptGoNest.js

Have 6+ years of professional software engineering experience.
Have at least 3 years of hands-on experience with payment systems or payment processing.
Bring strong backend engineering experience with Go, TypeScript, and Node.js.
Have direct experience owning production payment flows, not only basic payment API integrations.
Have experience integrating payment processors, gateways, or acquirers such as Stripe, Adyen, Braintree, Checkout.com, Worldpay, or Fiserv.
Understand the card payment lifecycle, including authorization, capture, settlement, refunds, chargebacks, and disputes.
Understand bank payment rails; ACH/NACHA knowledge, including returns and transaction timing, is preferred.
Have experience with payment reconciliation and settlement.
Understand webhooks, retries, idempotency, asynchronous processing, and distributed-system failure scenarios.
Have experience designing relational data models for transaction-heavy systems.
Understand PCI DSS and payment-security patterns such as tokenization and isolation of sensitive payment data.
Bring strong attention to correctness and edge cases in financial systems.
Be fluent with modern AI-assisted development tooling.
Have strong English communication skills and be able to work with 4–6 hours of daily overlap with US Central Time.

Own end-to-end payment flows in TypeScript/NestJS services, including authorization, capture, voids, refunds, disputes, and payout initiation and confirmation.
Build and maintain acquirer and processor integrations behind internal abstractions.
Design hosted and embedded checkout experiences using hosted fields, iframes, and tokenization to minimize PCI scope.
Implement fee calculation and rate logic, including tiers, interchange-plus, flat structures, rounding rules, and edge cases.
Build reconciliation and settlement capabilities that compare processor reports and settlement files with internal records and surface breaks.
Design event handling for idempotency, out-of-order and duplicate webhooks, retries, and state machines.
Integrate fraud, bank-account verification, and KYC providers.
Handle ACH submission windows, returns, return codes, NOCs, and retry rules.
Maintain audit trails and produce reconciliation evidence.
Advise product on payment-rail capabilities and review payment-adjacent code.

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