[8BE] Senior Backend Engineer

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 complex, high-impact projects. We’re 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 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 - Build and consume Shopify Webhooks and REST/GraphQL APIs (Storefront API, Admin API) - 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 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) - Marketplace API integrations (Amazon SP-API, Walmart) - Event-driven architecture (EventBridge, RabbitMQ) - Keycloak and multi-realm identity management - EF Core with Npgsql - Promotional products or print-on-demand domain knowledge