Principal .NET Software Engineer- Cloud Platform

Versapay turns accounts receivable (AR) into a competitive advantage. We automate AR processes, remove friction, unlock working capital, and accelerate momentum—giving finance leaders clarity and control to drive business forward.

• Platform & Architecture
  • Own and evolve core payment services for online (CNP), device-based EMV (CP), digital wallets (Apple Pay, Google Pay), and payment facilitator/orchestration flows.
  • Modernize and improve existing components into more cloud-native, distributed architectures using containers on AWS/Azure.
• Payment Flows
  • Own and extend end-to-end payment workflows: authorization, capture, void, refund, tokenization, clearing, funding, settlement, and multi-source reconciliation.
  • Expand capabilities for international payments, including multi-currency and cross-border flows.
  • Integrate with payment service providers (PSPs), EMV card readers, and device SDKs using secure, standards-based messaging.
• Delivery & Reliability
  • Improve and maintain CI/CD pipelines in Git Hub Actions.
  • Design and evolve test automation strategy.
  • Strengthen platform reliability through observability, fault-tolerant design, and automated operational workflows.
• Collaboration & Leadership
  • Partner with Product, Security, Compliance, and Operations.
  • Mentor engineers, lead design and architecture discussions, and influence long-term strategy.

• 10+ years of professional engineering with expert proficiency in C#, .NET, and SQL.
• Deep experience in payments: online payments, EMV device-based transactions, digital wallets, Pay Fac/orchestration flows, ACH/EFT, international/multi-currency payment flows.
• Proven ability to modernize production financial systems into cloud-native, distributed architectures.
• Familiarity with monitoring and observing distributed systems using modern observability tooling.
• Proven ability to work cross-functionally with Product, Security, Compliance, and Operations, and to represent engineering effectively to non-technical stakeholders.
• Experience using AI-assisted development tools to enhance productivity and code quality.

• ISO 8583 transaction messaging.
• ISO 20022 data models and payment messaging.
• DUKPT key‑management and secure device cryptography.
• Hardware Security Modules (HSMs) and secure key lifecycle.
• EMV payment kernels and card/device authentication flows.

• Modern API and integration design (RESTful services), asynchronous messaging, caching, event-driven architecture, high-availability patterns.
• AWS or Azure, containerization, orchestration, and CI/CD automation.
• PCI-DSS, encryption, tokenization, key-rotation, and secure coding principles.

• Experience with multi-region cloud architecture and distributed data patterns.
• Experience with modern UX/front-end development (JavaScript/Type Script).

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.