Senior .NET Developer – Enterprise Integration (Hybrid, Warsaw)

emagine; Województwo mazowieckie; Hybrid; PLN 180,000 - 240,000; Part time

Job summary

emagine is seeking a Senior .NET Developer to own a business-critical enterprise integration platform in Warsaw. You will handle backend development, batch processing, SQL Server optimisation, enterprise integrations and production support, with the chance to contribute to the modernisation of an established .NET Framework solution.

The role emphasizes Windows Services, WCF/SOAP, XML/XSD/XSLT, and DI/IoC, with additional opportunities to migrate toward modern .NET and REST-based integrations.

Qualifications

• 5+ years of professional experience as a .NET Developer / Software Engineer.
• Strong hands-on experience with C# and .NET Framework 4.x.
• Experience developing and maintaining Windows Services.
• Strong understanding of multithreading and the Task Parallel Library.
• Very good knowledge of Microsoft SQL Server and T-SQL.
• Experience with stored procedures, query tuning, transactions, isolation levels, locking, deadlock analysis.
• Hands-on experience with WCF and SOAP services.
• Experience configuring service references, bindings and endpoints.
• Good knowledge of XML, XSD and XSLT.
• Experience with object mapping tools such as AutoMapper.
• Familiarity with lightweight ORMs such as Dapper.
• Experience with Dependency Injection / IoC frameworks.
• Experience with unit testing and mocking frameworks.
• Git experience.
• Strong analytical and troubleshooting skills.
• Very good English communication skills.

Responsibilities

• Maintaining and extending an established C# / .NET Framework 4.x Windows Service.
• Supporting multi-threaded, timer-driven import and export processing.
• Investigating and resolving production issues across application and data layers.
• Developing and optimising SQL Server / T-SQL solutions.
• Maintaining stored procedures and Dapper-based repositories.
• Analysing and resolving locking, deadlock and performance issues.
• Maintaining mappings between enterprise canonical data models.
• Working with shipment, status event, milestone and customs declaration data.
• Maintaining WCF / SOAP integrations, service references, bindings and endpoints.
• Working with XML serialisation, XSD schemas and XSLT mappings.
• Providing 2nd and 3rd level production support.
• Reprocessing and correcting data when required.
• Working closely with business, operations, integration and master data teams.
• Contributing to unit and integration testing, code reviews and technical documentation.
• Supporting the modernisation roadmap of the platform.
• Contributing to potential migration towards modern .NET, standard Dependency Injection and REST-based integrations.

Skills

C#

NET Framework 4.x

Multithreading

SQL Server / T-SQL

WCF / SOAP

XML / XSD / XSLT

AutoMapper

Dapper

Dependency Injection / IoC

Unit testing

Git

English communication

Tools

AutoMapper

Dapper

Git

Azure Functions / App Services

Job description

emagine is seeking a Senior .NET Developer to own a business-critical enterprise integration platform in Warsaw. You will handle backend development, batch processing, SQL Server optimisation, enterprise integrations and production support, with the chance to contribute to the modernisation of an established .NET Framework solution.

The role emphasizes Windows Services, WCF/SOAP, XML/XSD/XSLT, and DI/IoC, with additional opportunities to migrate toward modern .NET and REST-based integrations.