.NET Developer (Backend / Full-Stack Platform)

Comarch EDI develops a proprietary E-Invoicing platform that ensures secure global information exchange. The platform requires high precision, high-performance SQL Server database, and active implementation of AI-driven solutions in daily workflows.

• Higher education
• Minimum 3 years (Mid) or 5 years (Senior) of professional experience in commercial IT projects
• Very good knowledge of C# and .NET
• Experience with Microsoft SQL Server
• Ability to create and maintain Windows Services
• Practical knowledge of REST API and SOAP/WCF
• Experience using development support tools (e.g., GitHub Copilot, Claude Code)
• English language skills at B2 level for communication and reading technical documentation
• Creativity and solution-oriented mindset
• Ability to work in a team, excellent organization, and communication skills

Nice to have:

• Knowledge of at least one communication protocol: AS2, AS4, Peppol
• Experience with messaging systems (RabbitMQ, Kafka)
• Knowledge of container technologies (Docker)
• Experience in EDI / E-commerce industry

• Develop key backend services of the Comarch EDI / E-Invoicing platform (.NET Framework/.NET Core), including Document Processing pipeline, Document Mapping Service, Signing Service, transport services (AS2, AS4, SFTP, Peppol, etc.), Archive Service, and Tracking Service
• Work with SQL Server databases using T-SQL and create optimal SQL queries
• Provide L3 production support by diagnosing and resolving complex technical issues related to document processing, integration, and platform services
• Participate in platform modernization, including migration from .NET Framework/.NET Core to newer framework versions and standardization of Windows Services
• Participate in biweekly architectural reviews, present solutions, and contribute to platform architecture evolution
• Improve code quality by writing unit and integration tests, performing code reviews, and maintaining technical documentation