Principal .NET Software Engineer - Cloud Payments Platform
New
United States (Remote)Full-TimePrincipal
Salary150,000 - 180,000 USD per year
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Job Details
- Experience
- Significant experience (typically 10+ years)
- Required Skills
- AWSSQLC#Azure.NETCoachingDistributed Systems
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
- 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
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.
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