Senior Fullstack Engineer – .NET, React
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Job Description
Senior Fullstack Engineer building Shopify, .NET, and React shipping services for a US promotional products e-commerce company. Integrating carriers, storefronts, and order management systems.
Responsibilities:
- Build and own the Shopify storefront integration, including Admin API, webhooks, and checkout integration points
- Develop React interfaces, including admin and configuration tools
- Design and implement .NET 8 Web API endpoints and services
- Integrate third-party APIs behind clean adapter layers
- Work with event-driven messaging using SNS/SQS, including idempotent handling and retries
- Keep customer-facing flows fast and resilient
- Align API contracts with the client’s storefront partner
- Write unit, integration, and component tests
- Document APIs using OpenAPI and integration flows in Confluence
- Participate in code reviews, sprint ceremonies, and technical sessions with the client
Requirements:
- 5+ years of full-stack development with strong C# / .NET (ASP.NET Core, .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
- Nice to have: Shopify Plus, Hydrogen, or headless commerce storefronts
- Nice to have: Admin UIs built with component libraries (Polaris, MUI, or similar)
- Nice to have: Retail, e-commerce, or promotional products domain knowledge
Benefits:
- Employees can work remotely
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