Senior Fullstack Engineer – .NET, React

• 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

• 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

• Employees can work remotely