Senior .NET Framework Developer
Posted
We are looking for a Senior .NET Developer to join a business-critical integration project within the logistics industry.
The role combines maintaining and stabilising the existing solution with helping the organisation modernise its integration architecture.
This is not a maintenance-only position. You will have the opportunity to analyse the current platform at an architectural level, influence its future direction, and support the transition from.NET Framework and WCF-based integrations to modern .NET and REST APIs.
Work Mode: hybrid from Warsaw office (3 days/week)
Start of the project: ASAP
Duration of the project: till the end of 2027 (with possibility of extension)
We offer
- Dedicated Agent support – your go-to person for project continuity, client communication, day-to-day administration, and long-term professional development
- Access to Darize Learning & Development – our internal development platform featuring webinars, industry reports and articles, access to learning platforms such as DataCamp and Coursera, and regular invitations to technical, business, and lifestyle events
- Community and networking events – from Kick-Off trips, Christmas celebrations, and Summer Sport Games to family picnics and cultural events for you and your loved ones
- Consultant Development Program – personalized professional development support based on current industry trends and market needs, delivered by experienced mentors and development advisors
- Comprehensive benefits package – including private healthcare, life insurance, a sports card for you and your family members, as well as access to employee discounts in Poland and abroad
- A community of experienced IT experts – exchange knowledge and collaborate with technology professionals who bring years of hands-on experience delivering complex technology projects (the average professional experience of our consultants in Poland exceeds 10 years)
- At least 6 years of commercial experience in .NET development or a similar software engineering role
- Strong hands-on experience with C# and .NET Framework 4.x
- Experience developing and maintaining Windows Services
- Practical knowledge of multithreading and the Task Parallel Library
- Strong experience with Microsoft SQL Server and T-SQL
- Hands-on experience with WCF/SOAP services
- Good understanding of REST APIs and modern integration approaches
- Experience with XML, XSD schemas, XML serialization, and XSLT mappings
- Knowledge of object mapping tools such as AutoMapper
- Experience with lightweight ORMs, preferably Dapper
- Familiarity with dependency injection
- Experience with unit testing frameworks such as MSTest and mocking libraries such as Moq
- Practical knowledge of Git
- Architectural mindset and the ability to understand dependencies between applications, services, and integrations
- Willingness to work with an existing legacy codebase while actively supporting its modernisation
- Fluent English, minimum C1 level
- Polish language proficiency
Nice to have
- Experience migrating applications from.NET Framework to modern .NET, including .NET 8+
- Knowledge of freight forwarding or logistics processes, including shipments, transport stages, and status events
- Experience with Microsoft Azure, particularly Azure Functions or App Services
- Familiarity with Docker and Kubernetes
- Understanding of enterprise integration or ESB environments
- Experience working in Agile or Scrum teams