[Remote] Principal .NET Software Engineer - Cloud Payments Platform

Note: The job is a remote job and is open to candidates in USA. Versapay is a company that transforms accounts receivable into a competitive advantage. They are seeking an experienced .NET Principal Software Engineer to modernize their payments infrastructure, enhance scalability and security, and design new distributed services that add value.

Responsibilities

• Own and evolve core payment services for online (CNP), device-based EMV (CP), digital wallets (e.g., 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
• 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
• Improve and maintain CI/CD pipelines in GitHub Actions (automated builds, tests, security scans, packaging, deployments)
• Design and evolve test automation strategy, covering domain-level logic, API contracts, and integration with external processors and devices
• Strengthen platform reliability through observability (metrics, logs, traces), fault-tolerant design, and automated operational workflows
• Partner with Product, Security, Compliance, and Operations to deliver features that balance customer experience, regulatory requirements, risk, and operational robustness
• Mentor engineers, lead design and architecture discussions, and influence the long-term strategy for the payments platform

Skills

• Significant experience (typically 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 (e.g., Apple Pay, Google Pay), PayFac/orchestration flows, bank account rails (ACH/EFT), and 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
• Deep hands-on experience with several of the following: 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
• Strong knowledge of: Modern API and integration design (RESTful services), asynchronous messaging/queueing, 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 (e.g., JavaScript/TypeScript)

Company Overview

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