Senior .NET Developer

Are you an experienced .NET Developer who enjoys solving complex technical challenges, improving mature systems, and bringing legacy applications into the modern era?

We’re looking for a Senior .NET Developer to join an international technology environment and contribute to the development, modernization, and maintenance of a business-critical digital platform .

This role is particularly suited to someone who combines strong C#/.NET expertise with hands-on PostgreSQL and SQL skills and is comfortable working across both legacy and modern technologies.

🚀 What You’ll Be Doing:

• Develop, maintain, and continuously improve a business-critical .NET application .
• Contribute to the gradual modernization of a legacy .NET platform , while ensuring stability and preserving existing functionality.
• Work across both .NET Framework and modern .NET (.NET Core / .NET 6+) environments.
• Troubleshoot complex application and database-related issues.
• Write, analyze, and optimize raw SQL queries to improve application and database performance.
• Identify performance bottlenecks and implement effective technical solutions.
• Refactor existing code to improve maintainability, scalability, and overall quality.
• Develop and maintain unit and integration tests .
• Collaborate closely with other developers and stakeholders while taking ownership of individual technical challenges.
• Participate in Agile ceremonies and contribute to continuous improvement across the development lifecycle.
• Explore and use AI-assisted development tools to improve productivity, code quality, and problem-solving.

🔎 What We’re Looking For:

Must-Have Skills:

• Strong professional experience with C# and .NET .
• Commercial experience with both:
• .NET Framework
• Modern .NET (.NET Core / .NET 6+)
• Strong hands-on experience with PostgreSQL in production environments .
• Excellent knowledge of raw SQL , including:
• Complex queries
• Query optimization
• Performance tuning
• Database troubleshooting
• Experience maintaining, refactoring, or modernizing legacy applications .
• Experience with Git/GitHub and collaborative development workflows.
• Hands-on experience with unit and integration testing .
• Experience working within Agile/Scrum environments .
• Strong troubleshooting and analytical problem-solving capabilities.
• Good communication skills and the ability to explain technical topics clearly.
• A proactive and independent mindset , with the ability to take ownership of technical challenges.

⭐ Nice to Have:

• Experience with CI/CD pipelines , such as Azure DevOps or GitHub Actions.
• Experience with Entity Framework or other ORM technologies .
• Good understanding of software engineering principles such as SOLID and clean code practices.
• Experience with cloud platforms and/or broader DevOps practices .
• Hands-on experience incorporating AI-assisted development tools such as GitHub Copilot, Claude Code, Cursor, ChatGPT, or similar into your development workflow.

💡 The Profile We’re Looking For:

We’re particularly interested in developers who are comfortable working in the space between legacy and modern software engineering .

You should be equally confident navigating an established .NET codebase, investigating a complex PostgreSQL/SQL performance issue , and contributing to the modernization of the application using current .NET practices.

This is a great opportunity for someone who enjoys troubleshooting, modernization, performance optimization, and technical ownership , rather than focusing exclusively on greenfield development.

If you’re a strong .NET engineer who enjoys understanding how complex systems really work and improving them step by step, we’d like to hear from you.