Senior .NET Developer (Enterprise Integrations)

Quick Facts

• Role: Senior .NET Developer (Enterprise Integrations)
• Location/Work model: Warsaw | Hybrid (3 days/week onsite)
• Contract: B2B

Description

Work on a business-critical integration platform for shipment, status, and customs-related data coming from multiple systems. Maintain and enhance an established C#/.NET Framework solution (Windows Services), optimize SQL Server/T-SQL, and build integrations using WCF/SOAP. Support production troubleshooting and the gradual modernization toward modern .NET and REST-based integrations.

Responsibilities

• Maintain and further develop an existing C# / .NET Framework solution based on Windows Services
• Develop and optimize SQL Server / T-SQL (stored procedures, query performance, transactions, deadlock analysis)
• Maintain data mappings and processing logic using AutoMapper, Dapper, and XML/XSD
• Develop and maintain WCF/SOAP-based integrations
• Analyze and resolve production and data consistency issues
• Cooperate with integration, business, and master data teams
• Support platform modernization to modern .NET and REST-based integrations
• Create and maintain unit/integration tests, technical documentation, and development standards

Requirements

• 5+ years of commercial .NET development experience
• Strong knowledge of C# and .NET Framework 4.x
• Experience with Windows Services and multithreaded processing
• Very good knowledge of Microsoft SQL Server and T-SQL, including stored procedures, query optimisation, transactions, and deadlocks
• Hands-on experience with WCF/SOAP integrations
• Experience with XML, XSD, and XSLT
• Familiarity with Dapper, AutoMapper, and dependency injection
• Experience with unit testing and mocking frameworks such as MSTest and Moq
• Experience with Git
• Strong analytical and troubleshooting skills
• Good command of English

Benefits

• Opportunity to work on a business-critical integration platform in a global logistics environment
• Maintain existing platform and contribute to technical modernization
• Private medical care (LuxMed)
• MultiSport card