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# Senior Software Engineer (Payments)

- **Company:** OrderYOYO
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Automation of Tests, Microsoft Azure, Continuous Integration, Distributed Systems, Key Management, Role-Based Access Control, Secure Coding, Webhooks, Microservices
- **Published:** June 7, 2026
- **Apply:** https://de.indeed.com/viewjob?jk=0a679649dbf8d587

## About the Role

* Strong backend engineering background in distributed systems (microservices, async processing, resilient APIs, eventual consistency).
 * Production experience with payment flows (auth/capture/refund, webhooks, reconciliation) and "money correctness" patterns (idempotency keys, double-entry thinking, auditability).
 * Solid security mindset: PCI, protecting PII, secrets management, least privilege, secure coding.
 * Comfortable in an Azure-first environment (APIs, queues/eventing, monitoring), and with CI/CD + automated testing practices.
 * Clear communication with non-technical stakeholders in high-stakes scenarios (incidents, financial breaks, compliance asks)., * Experience with sub-merchant / marketplace / Payfac-like operating models (KYC, underwriting, settlements, fee deductions).
 * Familiarity with dispute tooling, scheme rules, 3DS/risk rules, or fraud platforms.

## Description

Own and evolve OrderYOYO's payments capabilities across online + in-store (POS, Kiosk & Payment terminals), supporting the transition to a more scalable operating model, and enabling capabilities like KYC onboarding, deductions, settlement/payout timing, dispute flows, and merchant invoicing., * Design, build and operate payment-domain services (gateway integrations, payment intent/authorisation/capture/refund flows, payout orchestration, reconciliation).

 * Implement marketplace capabilities where relevant: onboarding/KYC integration, merchant configuration, settlement instructions, deductions, and invoicing/merchant-statement alignment.
 * Build robust "flow-of-funds" primitives: idempotency, ledgers/events, audit trails, and supportability for finance/compliance.
 * Integrate with PSP and partner tooling with attention to tri-party / sub-merchant implications where applicable.
 * Implement dispute/chargeback and fraud-handling touchpoints (internal workflows + PSP tooling), and collaborate with ops on runbooks and escalation paths.
 * Work closely with Product, Legal/Compliance, Finance, and Support to convert requirements into safe, testable production behaviour.
 * Raise engineering quality in a high-change domain: automated tests, safe rollouts/canaries, observability, and incident response improvements.
 * Mentor engineers, lead design reviews, and contribute to shared standards and documentation (payments is too critical to be tribal knowledge).


## Related Videos

- [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider)
- [Beyond Webhooks: The Future of Scalable API Event Delivery](https://www.wearedevelopers.com/videos/100312-beyond-webhooks-the-future-of-scalable-api-event-delivery)
- [How to Cause (or Prevent) a Massive Data Breach- Secure Coding and IDOR](https://www.wearedevelopers.com/videos/39-how-to-cause-or-prevent-a-massive-data-breach-secure-coding-and-idor)
- [Microservices: how to get started with Spring Boot and Kubernetes](https://www.wearedevelopers.com/videos/242-microservices-how-to-get-started-with-spring-boot-and-kubernetes)
- [APIs and Architecture for scaling omnichannel payments](https://www.wearedevelopers.com/videos/90-apis-and-architecture-for-scaling-omnichannel-payments)
- [The Vonage Trivia Voyage: Quiz Your Way to the Top!](https://www.wearedevelopers.com/videos/761-the-vonage-trivia-voyage-quiz-your-way-to-the-top)

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