MM-0064 Senior .NET Developer – Integration Batch Services (ODS)

Senior .NET Developer – Enterprise Integrations

Location: Warsaw | Hybrid – 3 days per week from the client’s office
Contract: B2B

About the role

We are looking for an experienced Senior .NET Developer to join an international organisation operating in the transport and logistics industry.

You will work on a business-critical integration platform responsible for processing and consolidating shipment, status and customs-related data from multiple systems. The role combines backend development, system integration, production troubleshooting and gradual modernisation of an established .NET solution.

Your responsibilities

• Maintain and further develop an existing C# / .NET Framework solution based on Windows Services.
• Develop and optimise SQL Server / T-SQL, including stored procedures, query performance, transactions and deadlock analysis.
• Maintain data mappings and processing logic using AutoMapper, Dapper and XML/XSD.
• Develop and maintain integrations based on WCF/SOAP.
• Analyse and resolve production and data consistency issues.
• Cooperate with integration, business and master data teams.
• Support the platform’s modernisation towards modern .NET and REST-based integrations.
• Create and maintain unit and integration tests, technical documentation and development standards.

What we’re looking for

• 5+ years of commercial experience in .NET development.
• 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.

Nice to have

• Experience in the logistics or transport industry.
• Experience migrating legacy .NET Framework applications to modern .NET (8+).
• Knowledge of REST APIs.
• Experience with Microsoft Azure, including Azure Functions or App Services.
• Knowledge of Docker and Kubernetes.
• Experience working in Agile/Scrum environments.

What we offer

• Opportunity to work on a business-critical integration platform used in a global logistics environment.
• Involvement in both maintaining the existing platform and its technical modernisation.
• Private medical care with LuxMed.
• MultiSport card.

Tech stack

C# | .NET Framework | SQL Server | T-SQL | WCF | SOAP | Dapper | AutoMapper | XML | XSD | XSLT | MSTest | Moq | Git

Nice to have: .NET 8+ | REST | Azure | Docker | Kubernetes