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Mercell Logo Mercell · IT - Software Development

Senior Software Engineer (.NET)

Netherlands; Portugal, Utrecht · Job Posted January 03, 2026
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Job Description

Mercell is seeking Senior Software Engineers to join our engineering team. In this role, you'll be instrumental in developing and optimizing applications within a cloud-native architecture. If you're passionate about building secure, scalable, and high-performance software solutions, and thrive in a collaborative, innovative environment, we encourage you to apply!

Job Responsibility

  • Design, develop, and maintain robust applications using ASP.NET, .NET Core, and .NET Framework
  • Integrate and optimize services within Amazon Web Services (AWS), including SNS, S3, RDS, ECS, EKS, Lambda, etc.
  • Support the creation of secure, scalable, and high-performance software solutions
  • Collaborate closely with other teams and stakeholders to ensure architectural consistency and promote best practices
  • Provide expert guidance on platform improvements and technical challenges
  • Optimize database queries and maintain stored procedures using your strong SQL knowledge
  • Contribute to our CI/CD and SDL processes, with a focus on test automation

Requirements

  • Senior-level experience with the .NET ecosystem (ASP.NET, .NET Core, .NET Framework)
  • Proven experience with cloud computing services, preferably AWS
  • Strong background in building web applications
  • A solid understanding of CI/CD, SDLC processes, and test automation
  • Adherence to clean code principles
  • Strong SQL knowledge and experience with stored procedures
  • Excellent problem-solving skills and the ability to work both independently and collaboratively within a team

Nice to have

  • A positive attitude and strong communication skills
  • A collaborative spirit
  • you enjoy teamwork, coaching, and helping others
  • The ability to navigate complex codebases with minimal documentation and improve them as needed
  • Proficiency in troubleshooting complex issues within production systems
  • A commitment to continuously communicating progress and plans to stakeholders
  • A professional, respectful, and responsible work ethic
  • A passion for continuous improvement and learning
  • Adaptability when dealing with tight deadlines and scope changes
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