Senior / Middle .NET Developer at Sigma Software — Poland

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About The Role

Design, develop, and maintain robust backend solutions using .NET Framework 4.8 and C#
Take ownership of features throughout the full development lifecycle, from requirements analysis to production deployment
Develop clean, maintainable, scalable, and well-tested code following engineering best practices
Support, optimize, and troubleshoot distributed messaging and service-oriented systems built with MSMQ and WCF
Design and optimize SQL Server database structures, queries, indexes, and stored procedures
Implement and maintain distributed caching solutions using NCache or similar technologies
Participate in architectural discussions focused on scalability, reliability, and system performance
Collaborate closely with developers, QA engineers, DevOps specialists, and product stakeholders
Contribute to system monitoring, troubleshooting, and production issue resolution
Ensure high standards of application performance, security, and maintainability
4+ years of commercial software development experience with .NET and C#
Familiarity with .NET Framework 4.8
Solid understanding of OOP principles, system design, and software architecture
Hands-on experience with MSMQ and WCF or similar technologies
Good SQL Server knowledge including relational database design, query optimization, indexing, and T-SQL
Experience working with distributed caching solutions such as NCache or similar tools
Understanding of distributed systems and event-driven architecture principles
Experience with unit, integration, and performance testing
Familiarity with non-functional requirements including scalability, security, high availability, and performance optimization
At least Upper-Intermediate English level