Senior C# / .NET Developer

Porto, Portugal
Senior (4-6 Years)
Hybrid
English and Portuguese Required

We are looking for a Senior C# / .NET Developer to work in Porto who is eager to embark on an exciting new opportunity!

What is this challenge about

  • Develop and maintain microservices in .NET / ASP.NET Core.
  • Design and expose high-performance, secure, and scalable RESTful APIs.
  • Implement messaging solutions based on Kafka or Solace, ensuring resilience, idempotence, and event ordering.
  • Apply concurrency and parallelism patterns using the Task Parallel Library (TPL), prioritizing efficiency and performance.
  • Develop automated tests (unit, integration, and contract), ensuring continuous quality and adequate coverage.
  • Work with relational or NoSQL databases (e.g., SQL Server, PostgreSQL, MongoDB), ensuring efficient modeling and best practices for data access.
  • Contribute to the evolution of cross-functional libraries (chassis framework), ensuring consistency in logging, telemetry, security, and configuration.
  • Participate in code reviews, standard setting, and continuous improvement of the development cycle.
  • Collaborate with DevOps, QA, and Architecture teams to ensure robust and observable deliveries.

What we’re looking for

  • 5+ years of experience with C# / .NET 8.
  • Hands-on experience with microservices, REST APIs, and messaging (Kafka, Solace, RabbitMQ, or similar).
  • Experience with containers (Docker) and CI/CD pipelines (GitHub Actions, Azure DevOps, etc.).
  • Familiarity with logging, observability, and tracing (OpenTelemetry, Grafana, Prometheus).
  • Strong foundation in design patterns, SOLID, and Domain-Driven Design (DDD).
  • Knowledge of TPL (Task Parallel Library) and asynchronous programming is a plus.

Nice to have

  • Knowledge of Kubernetes (AKS, OpenShift, or GKE).
  • Experience with shared frameworks (chassis frameworks / internal SDKs).
  • Experience migrating C# applications to Kubernetes, and observability practices.
  • Familiarity with cloud platforms.

We connect IT professionals with projects that match their skills, professional experience, and goals, then we offer a career progression program, delivered by in-house specialists - our People Experience Partners - to guide them through our journey with us.

What we offer:

  • A project that matches your skills and ambitions, as well as your preferences for working policies and culture.
  • A competitive salary with awesome benefits and opportunities to leverage your knowledge and network to earn additional income.
  • An empowering and respectful work culture enriched with social and learning events.
  • A People Experience Partner specially assigned to you - your go-to career guide, responsible for supporting your growth, facilitating training, and ensuring your work-life balance at KWAN.
At KWAN, they make sure that I feel comfortable with the client I’m working for and that what I’m doing aligns with my career aspirations.
Luis Caldeira, DevOps @ KWAN
At KWAN, I’m given the space to be myself and do what I love. I have control over the projects I work on, as well as the direction of my career.
Pedro Fonseca, Front End Developer @ KWAN
I see my People Experience Partner as someone who is always available to provide me with motivation and constant feedback, which helps me be sure that I am in the right place.
Josimar dos Reis, Software Developer @ KWAN
I know that I’ve contributed to the growth of a company that truly values a “people first culture”, because my ideas, experiences, and individuality were always appreciated.
João Nascimento, Software Developer (KWAN Alumni)
My two years at KWAN were an incredible experience! From the start, I was welcomed into a warm and collaborative environment where I felt truly supported.
Laís Ortiz, Software Developer @ (KWAN Alumni)
Grab this opportunity, apply now!

What You Can Expect as a KWANer

Respect isn’t optional here

You’re trusted to deliver and supported to speak up.

Dedicated People Experience Partner

Someone accountable for your growth, not your allocation.

Continuous learning, built in

Learning that keeps pace with the systems you build.

Recognition that’s visible

Your impact doesn’t go unnoticed. Through our Rocket Points System, we constantly recognize your contributions.

A culture you can feel

From movie and quiz nights to dinners and our annual summer gathering, we don’t just work together - we build real connections.

Flexible spaces to work your way

Remote-first, with physical hubs when you want connection.

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We review every application. If there’s alignment, we won’t let it get lost in a database.