Senior .NET Developer M/F

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.

Tech Stack:

• Core: C#, .NET 8+, 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

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 the 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., * 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 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.

• A personalized onboarding experience that welcomes and supports you throughout your journey.
• Regular and constructive feedback to boost your growth and development.
• A dynamic project with a prestigious international client.
• A competitive salary package, aligned with your experience and skills.
• Career development opportunities through ambitious and innovative tech projects.
• A collaborative culture that values creativity and individual progress.
• Access to exclusive discounts in a wide network of partners, including health, wellness, travel, culture, gastronomy, leisure and much more.
• Team-building events and initiatives that create memorable shared experiences.

Salary Range: 35.000€ - 45.000€ Gross Annual + Benefits

With over 25 years of experience, Sysmatch is a well-established name in IT Consultancy and Outsourcing, involved in both national and international projects that promote excellence in technology and services. Our secret? A team that blends talent, creativity, and experience to deliver robust, scalable, and tailored solutions.

We’re not just tech experts - we’re partners who support our clients’ transformation, anticipate trends, and drive their evolution. Flexibility, innovation, and a forward-thinking mindset are part of our DNA., About Shield AI

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