[8BE] Senior Fullstack Engineer (.NET + React)

Were partnering with a leading US promotional products and e-commerce company to build a new shipping and delivery service for its white-label B2B commerce platform. The platform runs on Shopify Plus with a .NET microservices backend on AWS. The new service connects major shipping carriers the storefront and the existing order management systems. Its a short focused engagement: a discovery phase then two-week sprints through production release.

What youll do:

• Build and own the Shopify storefront integration (Admin API webhooks checkout integration points)
• Develop React interfaces including admin and configuration tools
• Design and 8 Web API endpoints and services
• Integrate third-party APIs behind clean adapter layers
• Work with event-driven messaging (SNS/SQS) including idempotent handling and retries
• Keep customer-facing flows fast and resilient
• Align API contracts with the clients storefront partner
• Write unit integration and component tests
• Document APIs (OpenAPI) and integration flows in Confluence
• Take part in code reviews sprint ceremonies and technical sessions with the client

Qualifications :

Must have:

• 5 years of full-stack development with strong C# / .NET ( 6) and React (TypeScript)
• Hands-on Shopify integration: Admin API (GraphQL/REST) webhooks checkout integration
• Solid REST API design with OpenAPI / Swagger
• Third-party API integration: authentication rate limits retries error handling
• Working knowledge of AWS: Lambda SQS/SNS ECS
• Clean architecture: dependency injection DDD/CQRS concepts
• Testing discipline across backend and frontend
• Docker and CI/CD
• Excellent written and spoken English for daily client interaction

Nice to have:

• Shipping or carrier API experience
• Shopify Plus Hydrogen or headless commerce storefronts
• Admin UIs built with component libraries (Polaris MUI or similar)
• Retail e-commerce or promotional products domain knowledge

Remote Work :

Yes

Employment Type :

Full-time