Senior Software Engineer

Overview

NCR Voyix is seeking a Senior Software Engineer with strong C# and .NET expertise to build, modernize, and operate mission-critical payment and commerce platforms, owning complex technical capabilities from design through production support across legacy and modern technology stacks.

What you'll do

• Design, develop, test, deploy, and support secure, reliable applications using C#, .NET Framework, modern .NET, ASP.NET, ASP.NET Core, and Web APIs.
• Maintain and modernize legacy applications built with ASP.NET Web Forms and .NET Framework 4.7.2.
• Lead or contribute to service rewrites, platform modernization, system integrations, and complex data migrations.
• Build scalable, low-latency, event-driven services using messaging platforms such as RabbitMQ, Kafka, Azure Service Bus, or NATS JetStream.
• Design distributed caching and state-management solutions using Redis or Valkey.
• Build and operate containerized workloads using Docker, Kubernetes, and Azure Kubernetes Service.
• Design secure integrations involving Azure Key Vault, HSMs, encryption services, certificates, TLS, and mutual TLS.
• Apply asynchronous programming, concurrency, parallel processing, and multithreading techniques safely in high-throughput systems.
• Troubleshoot application, database, networking, performance, and production issues.
• Improve throughput, latency, reliability, scalability, and resource utilization through profiling, testing, and optimization.
• Build automation and operational tooling using PowerShell or similar scripting technologies.
• Build and maintain CI/CD workflows using GitHub Actions and Git-based source control.
• Contribute to database design, optimization, migration, and troubleshooting, including MySQL-based systems.
• Implement observability using structured logging, metrics, distributed tracing, dashboards, and actionable alerts.
• Use tools such as Splunk, AppDynamics, Jaeger, Grafana, Prometheus, Datadog, Elastic, or Kibana to monitor applications and investigate production behavior.
• Write architecture and design documentation, including sequence diagrams, flow diagrams, interface contracts, runbooks, and Architecture Decision Records.
• Apply sound software design principles including OOP, SOLID, DRY, Clean Architecture, dependency injection, and appropriate design patterns.
• Develop automated unit, integration, component, contract, and performance tests.
• Participate in code reviews and ensure quality, security, reliability, and operational readiness.
• Use AI coding tools and agentic workflows to improve design, development, testing, debugging, review, troubleshooting, documentation, and automation.
• Mentor junior and mid-level engineers through pairing, design discussions, technical guidance, and code reviews.
• Participate in on-call support, incident response, and post-incident reviews.
• Collaborate with product managers, architects, engineers, and stakeholders to convert ambiguous goals into reliable production systems.

What you'll need

• 7 to 10 years of professional software engineering experience.
• Strong production experience with C# and the .NET ecosystem.
• Experience with ASP.NET or ASP.NET Web Forms, .NET Framework 4.7.2 or later, modern .NET preferably .NET 8 or later, ASP.NET Core, and Web API development.
• Strong knowledge of software design and architecture principles including OOP, SOLID, DRY, Clean Architecture, dependency injection, and maintainable design patterns.
• Experience designing and supporting backend APIs, distributed services, or integration platforms.
• Demonstrated ownership of technical capabilities from design through production support.
• Experience writing automated tests and building operationally supportable software.
• Strong troubleshooting, debugging, root-cause analysis, and performance-improvement skills.
• Practical knowledge of asynchronous programming, concurrency, and multithreading.
• Working knowledge of HTTP and TCP-based communication.
• Experience with GitHub or another Git-based source-control and code-review platform.
• Ability to clearly explain architectural decisions and engineering trade-offs.
• Experience creating design documents, sequence diagrams, and data-flow diagrams.
• Experience mentoring engineers and conducting high-quality code reviews.
• Experience using logs, metrics, traces, dashboards, and alerts to diagnose production systems.
• Experience using AI coding tools such as GitHub Copilot, Claude, Claude Code, or equivalent tools.
• Hands-on experience or strong working knowledge of AI agents, automation agents, AI-assisted internal tooling, or multi-step agentic workflows.

Nice to have

• React or another modern front-end framework.
• Entity Framework Core in high-volume production systems.
• xUnit, NUnit, or comparable .NET testing frameworks.
• PowerShell or another scripting and automation language.
• Experience modernizing legacy .NET applications into modern .NET services.
• Experience with RabbitMQ, Kafka, Azure Service Bus, or NATS JetStream.
• Knowledge of event-driven architecture, asynchronous messaging patterns, message ordering, idempotency, retries, dead-letter handling, backpressure, and eventual consistency.
• Experience with Azure, AWS, AKS, Docker, Kubernetes, Terraform, and GitHub Actions.
• Experience with Redis, Valkey, MySQL, distributed caching, database optimization, and complex data migrations.
• Knowledge of HSMs, encryption, tokenization, key management, TLS, mTLS, certificates, and PCI-DSS or other regulated environments.
• Experience with observability tools such as Splunk, AppDynamics, Jaeger, Grafana, Prometheus, Datadog, Elastic, Kibana, OpsGenie, or OpenTelemetry.
• Knowledge of Retrieval-Augmented Generation, Model Context Protocol, multi-agent orchestration frameworks, prompt engineering, and AI-assisted internal tooling.
• Experience in payment processing, financial transaction platforms, retail commerce, hospitality commerce, e-commerce, marketplace platforms, real-time decisioning, or high-availability regulated systems.

Details

• Offers of employment are conditional upon passage of screening criteria applicable to the job.