Senior Backend Engineer (.NET)

• API & Service Architecture: Design, build, and maintain production-grade, secure RESTful APIs and microservices managing provider hierarchies, billing accounts, and payment lifecycle events.
• Event-Driven & Webhook Systems: Implement reliable, idempotent event consumers and webhook ingestion pipelines to process asynchronous notifications (e.g., ACH NOC events, banking state changes) with zero data loss.
• Data Migration & Modeling: Design normalized relational schemas and data transformation pipelines (DTOs, ETL backfills) to seamlessly migrate complex hierarchical records across platforms.
• Enterprise Integrations: Engineer reliable interfaces with external and internal partners-including CRM case management (Salesforce), tax identification verification (SOVOS), and banking validation services (Wells Fargo).
• State Machine & Workflow Automation: Develop scalable workflow engines and business rule decision trees governing automated verification gates (Auto-Approved, Auto-Declined, Pending Review) and CSR portal operations.
• Operational Excellence: Write comprehensive unit, integration, and contract tests, contribute to architecture reviews, and maintain clear API specifications.

Microsoft .NET, REST (Representational State Transfer), Application Programming Interface (API), Billing, Microservices, Architectural Design, Network Operations Center, Banking Services, Data Migration, DTOS, * 5+ years of professional experience in backend software engineering with statically typed languages (Java, C#, Go, or TypeScript/Node.js).

• RESTful API Engineering: Demonstrated mastery in designing, versioning, and documenting production REST APIs (handling deep pagination, complex DTO mappings, and high-throughput payloads).
• Relational Databases & SQL: Strong experience in relational data modeling (PostgreSQL, MySQL, or SQL Server), complex joins, foreign-key relationships, index Eligible to workimization, and data migration scripting.
• Distributed Systems & Event Architecture: Hands-on experience with message brokers/event buses (e.g., Kafka, RabbitMQ, AWS SQS/SNS) and designing idempotent consumers for webhook and asynchronous event handling.
• Enterprise Integration Patterns: Proven background integrating with third-party webhooks, REST/SOAP APIs, and handling retry strategies, circuit breakers, and distributed error handling.

Preferred Qualifications

• Prior experience in FinTech, Payment Processing, or Healthcare Payer/Provider Systems (familiarity with ACH, NACHA rules, NOC codes, TIN/NPI validation, or 835 EDI transactions).
• Experience integrating with Salesforce APIs (e.g., automated Case and Contact management).
• Familiarity with secure credential handling, financial compliance, and PII/PHI data privacy standards.

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