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Senior .NET Developer – Enterprise Integrations

AntalWarszawanofluffjobspublished 10/28/2026
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Must-have:C#GitAzureDockerKubernetesBackendScrumSeniorHybrid

About the company

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

Your tasks

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.

  • 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.

Requirements

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

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.

Must have: .NET, C#, .NET Framework, Windows, Microsoft SQL Server, T-SQL, WCF, SOAP, XML, XSD, XSLT, Dapper, AutoMapper, Unit testing, Moq, Git

Nice to have: Logistics, REST API, Microsoft Azure, Azure Functions, Docker, Kubernetes, Agile, Scrum

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.

Other

Senior .NET Developer – Enterprise Integrations Location: Warsaw | Hybrid – 3 days per week from the client’s office Contract: B2B