Senior Software Engineer .Net

About this role

At Mindera, we build resilient, high-throughput software. We are expanding our core engineering teams as part of a long-term partnership. We are looking for experienced Senior .NET Developers who thrive in complex engineering environments, enjoy solving challenging technical problems, and take ownership of the software they build. Reliability and quality are fundamental to our platform, so we're seeking product-minded engineers with proven experience in cloud-native distributed systems and a strong sense of ownership throughout the software development lifecycle. In this role, you'll be expected to contribute to architectural decisions, clearly articulate the trade-offs behind your technical choices, and take features from business refinement through implementation, deployment, and production monitoring. You'll work with modern engineering practices to build decoupled, maintainable systems that scale reliably in production. Your role goes beyond writing C# code. You are expected to own the delivery pipeline end to end: Refinement: Challenge ambiguous business requirements, analyze acceptance criteria, and ensure technical feasibility. Architecture: Design decoupled, scalable solutions using Event-Driven Architecture (EDA) patterns. Execution: Write highly concurrent, thread-safe applications using .NET 8 or later, with a strong preference for composition over inheritance. Verification: Treat Test-Driven Development (TDD) as an essential engineering practice by writing robust unit and integration tests using xUnit and WireMock to prevent regressions. Delivery & Operations: Deploy through modern CI/CD pipelines and proactively monitor production telemetry using tools such as AWS CloudWatch, New Relic, and GitHub Actions to ensure rapid troubleshooting and operational excellence. # The Tech Stack Core: C#, .NET 8+, ASP.NET Core Architecture: Microservices, Event-Driven Architecture (EDA), Distributed Systems Cloud & Messaging: AWS (ECS, EC2, SQS, SNS, S3) Databases & Caching: SQL, NoSQL, Redis, Valkey, DynamoDB Infrastructure & CI/CD: Terraform, GitHub Actions, TeamCity Quality Assurance: xUnit, WireMock, SpecFlow Requirements Expertise we are looking for: Engineering Seniority: 5+ years of experience designing and deploying complex, high-throughput backend systems using .NET. Cloud-Native Expertise: Deep, hands-on experience with AWS, particularly containerized workloads (ECS/EC2) and messaging services (SQS/SNS). System Design Mastery: Strong understanding of SOLID principles, dependency injection lifetimes, and the ASP.NET Core middleware pipeline. Concurrency Discipline: Expert knowledge of asynchronous programming in C#. You understand how the thread pool works and why synchronous blocking (for example, using `.Result` or `.Wait()`) can severely impact the scalability and reliability of web APIs. API Design: Strong understanding of RESTful APIs, idempotent operations, and global exception-handling strategies. Communication: Advanced or fluent English, with the ability to clearly communicate architectural decisions and technical trade-offs to stakeholders and cross-functional teams. It Would Be Fantastic If You Also Have Production experience with streaming platforms such as Kafka, Kinesis, or RabbitMQ. * Strong understanding of AWS services and cloud-native architectures. * Practical experience with LLMs and Generative AI using .NET or Python, particularly for AI-assisted engineering workflows and SDLC automation. Benefits The Things We Really Care About: Permanent contract Unlimited PTO Flexible working hours Training & conferences, create your own training plan Work with large scale systems powering global businesses Other Good Things: Choose Laptop & Peripherals that best suit your needs Hotspot with unlimited usage (PT), for work or Netflix ;) We have amazing offices in Porto, Aveiro, and Coimbra if you want to physically connect with minders. Remote from Portugal is also an option. Remote from other Countries will depend on your current location and Projects At the offices, we have a wide range of snacks to keep you fed and healthy Partnerships with local businesses Most of all, You get to work with a bunch of great people, where the whole team owns the project together in a politics-free environment. Our culture reflects our lean and self-organization attitude. We encourage our colleagues to take risks, make decisions, work in a collaborative way, and talk to everyone to enhance communication. Freedom and Responsibility go hand in hand, and we value commitment, feedback, and empathy. About Mindera At Mindera we use technology to build products we are proud of, with people we love. Software Engineering Applications, including Web and Mobile, are at the core of what we do at Mindera. We partner with our clients to understand their products and deliver high-performance, resilient, and scalable software systems that create an impact on their users and businesses across the world. You get to work with a bunch of great people, where the whole team owns the project together. Our culture reflects our lean and self management attitude. We encourage our colleagues to take risks, make decisions, work in a collaborative way and talk to everyone to enhance communication. We are proud of our work and we love to learn all and everything while navigating through an Agile, Lean and collaborative environment. Check out our Blog and our Handbook ! Our branches are located: Porto, Portugal | Aveiro, Portugal | Coimbra, Portugal | Leicester, UK | Casablanca, Morocco | San Diego, USA | San Francisco, USA | Chennai, India | Bengaluru, India | Cluj-Napoca, Romania