Senior Software Engineer – C#/.NET & Azure

CSI Companies is recruiting for a Senior Software Engineer to help modernize a Banking as a Service platform. The role designs and develops cloud-native applications, APIs, and microservices for banking, payments, partner onboarding, and integrations, while providing technical leadership and improving system reliability.

Responsibilities:

• Lead the design and development of APIs and microservices supporting partner onboarding and platform integrations
• Design scalable, secure, maintainable cloud-native solutions
• Collaborate with product managers, architects, and engineering teams to define requirements and deliver solutions
• Guide architectural decisions and document design options, tradeoffs, and technical direction
• Improve engineering practices through code reviews, mentoring, CI/CD, automated testing, and observability
• Develop monitoring and alerting capabilities supporting service-level commitments
• Lead incident response and root cause analysis to improve system reliability
• Refactor existing applications, resolve defects, deliver enhancements, and address technical debt

Requirements:

• Bachelor's degree in Computer Science or a related field, or foreign equivalent
• At least 6 years of relevant software engineering experience, including technical design and architecture responsibilities
• Strong hands-on experience with C#, .NET, ASP.NET, and SQL Server
• Experience designing, developing, and hosting cloud-native applications in Azure or AWS
• Experience with Azure services such as API Management, Azure SQL, Cosmos DB, and Key Vault
• Strong RESTful API design skills, including OAuth2 and OpenAPI; familiarity with SOAP, XML, and JSON
• Experience with microservices, distributed systems, and event-driven architecture using Service Bus, Event Hubs, or comparable technologies
• Familiarity with container technologies and caching frameworks
• Experience with Git/GitHub, CI/CD pipelines, build tools such as TeamCity, and blue-green deployments
• Experience with observability tools such as Datadog or Grafana
• Knowledge of financial services security practices and compliance standards, including PCI DSS and SOC 2
• Experience working in Agile development environments
• Candidates must be authorized to work in the United States without current or future sponsorship, including upon potential conversion to permanent employment
• Banking, payments, fintech, or embedded finance platform experience
• Familiarity with partner onboarding workflows and service-level agreement management
• Contributions to open-source projects or technical publications