Senior .NET Backend Engineer: Cloud-Native Microservices

act digital; Porto; On-site; EUR 55,000 - 75,000; Full time

Job summary

act digital in Porto, Portugal seeks an experienced Senior .NET Backend Engineer to design and build scalable backend systems. You will work with C#/.NET, develop REST APIs, microservices, and cloud-native solutions on Azure or AWS, while contributing to architecture, performance, reliability, and best practices.

You will collaborate with international teams, implement security patterns with JWT/OAuth, and containerize services using Docker and Kubernetes, ensuring production readiness and

Qualifications

• 5+ years of professional experience with C# and .NET
• Strong knowledge of .NET Core / .NET 6+
• Experience designing REST APIs and microservices
• Hands-on with Azure and/or AWS cloud environments
• Proficient in Entity Framework Core and SQL
• Proven ability to work in distributed systems and high-performing backends
• Fluent English communication for global collaboration

Responsibilities

• Design and develop scalable backend services and APIs
• Build resilient distributed systems and microservices
• Contribute to architectural decisions and system design
• Improve performance, scalability, and reliability
• Develop cloud-native solutions on Azure or AWS
• Promote clean, maintainable, and testable code
• Collaborate with international teams across the SDLC
• Implement secure authentication/authorization (JWT/OAuth)
• Containerize services with Docker and deploy on Kubernetes
• Support CI/CD and production readiness

Skills

C# & .NET

REST APIs

Microservices

Concurrency & Thread safety

Architectural thinking

English proficiency

Security patterns (JWT/OAuth)

DevOps collaboration

Tools

Docker

Kubernetes

Azure

AWS

Entity Framework Core

SQL

Job description

act digital in Porto, Portugal seeks an experienced Senior .NET Backend Engineer to design and build scalable backend systems. You will work with C#/.NET, develop REST APIs, microservices, and cloud-native solutions on Azure or AWS, while contributing to architecture, performance, reliability, and best practices.

You will collaborate with international teams, implement security patterns with JWT/OAuth, and containerize services using Docker and Kubernetes, ensuring production readiness and