.NET Developer

Alongside is a technology consulting company that supports clients in end-to-end project development, creating specialized teams, and recruiting qualified talent — offering flexible solutions tailored to each organization's needs. We are looking for a skilled .NET Backend Developer to join our team! The main focus will be backend (80%), with regular frontend work (20%), primarily around API integration with React.

Responsibilities:

• Work mainly on the Domain and Application Layers, implementing complex rules in the utilities sector
• Implement Command and Query handlers (CQRS)
• Work with Entity Framework Core, including mappings, migrations, and complex queries
• Implement REST controllers, API versioning, and authentication/authorization
• Document contracts and endpoints using Swagger/OpenAPI
• Configure and maintain background jobs with Hangfire
• Write unit and integration tests for domain, application, and infrastructure
• Collaborate with the frontend team to define and evolve API contracts
• Debug integration issues

• 3+ years of experience with .NET (C#)
• 2+ years with ASP.NET Core Web API
• Strong foundations in Clean Architecture, DDD, SOLID, and Design Patterns
• Proficiency in Entity Framework Core (migrations, queries, performance)
• Experience with relational databases such as SQL Server

Frontend knowledge (not a developer role requirement, but important):

• Familiarity with React.js and understanding of TypeScript fundamentals
• Understanding of React Query for API consumption
• Basic knowledge of CORS, JWT tokens, and SPA authentication

Nice-to-haves:

• Experience with Hangfire and distributed systems
• Familiarity with Event Sourcing or Event-Driven Architecture
• Experience with RabbitMQ, Azure Service Bus, or other message brokers

• Hybrid model: 3 days per week in the office (Lisbon).
• Employment Contract;

• Health Insurance;
• Meal Card.