Senior Back End Developer

About the role

You will take primary ownership of third-party integrations and supporting back-end work on a large-scale association web platform. This is a focused, well-scoped role: you will not be spread across CRM architecture or business rules discovery — that work is handled separately. Your lane is the integration layer and the back-end services that support it.

You will work alongside an existing development team and report into our technical lead. The platform is being built on a modern .NET stack with a clean architecture approach, and you will be expected to come up to speed quickly and deliver to a high standard independently.

What you will do

• Design and build third-party integrations, primarily Stripe (payments) and DocuSign (document workflows), via REST APIs and webhooks
• Develop and maintain back-end services and APIs (REST and GraphQL) within a Clean Architecture structure
• Write robust, well-tested code with strong unit test coverage
• Work within an Azure-hosted environment using Azure App Service
• Collaborate with the team on authentication and identity management via Microsoft Entra ID
• Coordinate with the broader development team to ensure integration work aligns with the platform's core data and business logic

What you will bring

• Solid hands-on experience with C# / .NET, particularly ASP.NET Core
• Strong understanding and practical application of Clean Architecture (Domain / Application / Infrastructure / API layering)
• Experience with Entity Framework Core and PostgreSQL
• Proven experience integrating third-party REST APIs and webhooks, specifically platforms such as Stripe and DocuSign
• Familiarity with GraphQL APIs
• A strong unit testing discipline — you write tests as a matter of course, not as an afterthought
• Working knowledge of Azure App Service
• Familiarity with Microsoft Entra ID for authentication and identity management
• Ability to work independently and take ownership of your scope without needing heavy direction

Engagement

• Type: Fixed-term
• Start: ASAP
• Location: Remote-friendly

To apply

Send your CV and a brief note on relevant experience to [email protected]. Applications without back-end integration experience (specifically REST APIs, webhooks, and payment/document platforms) will not be considered.