**What's the Project?** The client is a large US\-based company from the healthcare market. We are starting a multi\-phase, 2 years project focusing on replacement of the clinical and data platform, replacing the current system. The work will be concentrated on delivering a flexible and configurable workflow solution. You will work in a mid\-size team (20\-40 people), predominantly based in Central Europe, with a client in the United States. This will be an exciting, greenfield project in a highly demanding but also rewarding environment of modern healthcare, based on cloud architectures, in data\-driven and AI\-enhanced environment **Role Overview:** We are seeking an experienced Senior to Lead\-level Backend Engineer to architect and develop a sophisticated Utilization Management and Prior Authorization application using the latest .NET frameworks. This role requires deep expertise in building scalable, event\-driven architectures with complex workflow orchestration capabilities to support healthcare authorization workflows and clinical decision support. **You’re a perfect match if you have:** * Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience * **5\+ years** of professional experience with C\# and .NET framework * **3\+ years** with modern .NET (Core, .NET 5\+, ideally .NET 8\) * Advanced proficiency with ASP.NET Core, Web API, and RESTful service design * MS SQL Server experience including T\-SQL, performance tuning, and database design * **Workflow Engines**: Hands\-on experience implementing state\-driven workflow systems (e.g., Windows Workflow Foundation, Elsa Workflows, Workflow Core, or custom implementations) * **Rules Configuration**: Experience with rules engines and dynamic workflow configuration (e.g., Rules Engine, Drools.NET, or custom rule\-based systems) * **Message Bus Architecture**: Production experience with message brokers and event\-driven patterns (Azure Service Bus, RabbitMQ, MassTransit, NServiceBus, or Kafka) * **Microservices Architecture**: Deep understanding of service\-oriented architecture, API gateways, service discovery, and distributed systems patterns * Experience with Domain\-Driven Design (DDD) and CQRS patterns * Knowledge of containerization (Docker) and orchestration (Kubernetes) * Familiarity with Azure cloud services (App Services, Functions, Key Vault, Application Insights) * Experience with Entity Framework Core or Dapper * Understanding of authentication/authorization patterns (OAuth, JWT, Azure AD) * Background in event sourcing architectures * Experience with SignalR for real\-time communications * Knowledge of API versioning and backward compatibility strategies * **Technical Leadership (only for Lead candidates):** * Proven ability to mentor and guide development teams * Experience conducting code reviews and establishing coding standards * Track record of making architectural decisions for enterprise systems * Ability to evaluate and recommend new technologies and approaches * Strong documentation and communication skills **Nice to Have:** * Previous track record with US\-based client * Understanding of healthcare domain * Microsoft certifications (Azure Developer Associate, Azure Solutions Architect) * Experience with distributed tracing and observability (Application Insights, Seq, ELK) * Knowledge of performance profiling and optimization tools * Contributions to open\-source projects * Speaking experience at technical conferences or meetups **Your day\-to\-day activities** * Design and develop high\-performance backend services using .NET 8\+ and ASP.NET Core * Architect and implement state\-driven workflow engines with rules\-based configuration systems * Build and maintain event\-driven architectures using message bus patterns (Azure Service Bus, RabbitMQ, or similar) * Develop and optimize complex database solutions using MS SQL Server. * Design microservices architectures with proper service boundaries and inter\-service communication patterns * Participate in implementing CI/CD pipelines and maintain code quality standards in Azure DevOps (ADO) * Collaborate with cross\-functional teams to deliver scalable, maintainable solutions **Apply to:** \ Poderá encontrar o anúncio original publicado em: https://www.itjobs.pt/oferta/507390/senior\-lead\-net\-engineer