[8BE] Senior Backend Engineer (.NET)

Were building the backend of a white-label B2B e-commerce platform for a leading US promotional products company. The platform powers multiple branded Shopify Plus storefronts. It runs on a fully decoupled microservices architecture on AWS covering Identity Profile Order Management Inventory Pricing Catalog and Marketplace integrations. The existing legacy services stay supported while the migration happens.

What youll do:

• Design and build scalable RESTful microservices with Core Web API (.NET 8) and CQRS
• Own core services: Order Management Inventory Pricing Engine Catalog Sync and Notifications
• Integrate with external systems such as Amazon SP-API Walmart Marketplace API ERP payment gateways and tax services
• Work with legacy services where the migration is phased or partial
• Write unit integration and BDD tests (xUnit Reqnroll FluentAssertions)
• Define API contracts and inter-service communication (SQS EventBridge) with the Team Lead
• Take part in code reviews and architecture decisions and help hold the engineering standard
• Support environment setup and infrastructure-as-code with DevOps on AWS
• Join sprint planning stand-ups and technical discussions with the client

Qualifications :

Must have:

• 4 years of backend development with strong C# / .NET ( 6)
• Solid grasp of clean architecture: DDD CQRS repository pattern dependency injection
• Experience building and integrating REST APIs including OpenAPI / Swagger
• Working knowledge of AWS: Lambda SQS S3 RDS or DynamoDB
• Relational (PostgreSQL or SQL Server) and NoSQL (MongoDB) databases
• JWT / OAuth 2.0 authentication
• Brownfield experience: plugging new services into existing systems
• Docker and containerized workflows
• Strong written and spoken English
• Agile/Scrum with Jira

Nice to have:

• Retail e-commerce or B2B commerce experience (catalogs pricing engines cart/checkout marketplace integrations)
• Event-driven architecture (EventBridge RabbitMQ)
• Keycloak and multi-realm identity management
• EF Core with Npgsql
• Promotional products or print-on-demand domain knowledge

Remote Work :

Yes

Employment Type :

Full-time