Principal .NET Software Engineer- Cloud Payments Platform

Versapay is looking for an experienced.NET Principal Software Engineer to evolve and modernize their payments infrastructure, improve scalability and security, and design new distributed services.

Requirements

• 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

Benefits

• Generous Paid Time Off
• 401k Matching
• Retirement Plan
• Relocation Assistance