[8BE] Senior Backend Engineer (.NET)

What you’ll do:

* Design and build scalable RESTful microservices with ASP.NET 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 (ASP.NET Core, .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

Company Description
Software Mind is a software engineering partner that builds and scales digital products for companies in the US and Europe. Our LATAM teams work directly with client engineering teams on long-term, high-impact projects.