Senior .NET Developer with WPF and REST APIs, Portfolio Management System

Breslavia
Cracovia
Lodz
Lublinie
Remote.Poland
Varsovia

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Project overview

The project focuses on building and evolving a Portfolio Management System that includes backend services, messaging, and desktop-based user interfaces. The solution integrates multiple systems, processes large volumes of data, and supports continuous delivery through automated pipelines.

Team

You will work in a cross-functional team consisting of backend developers, desktop developers, QA engineers, and DevOps specialists. The team collaborates closely through code reviews, shared technical discussions, and iterative delivery.

Position overview

We are looking for a Senior .NET Developer to work on a long-term Portfolio Management System that combines backend services, desktop applications, and system integrations. You will be involved in designing, developing, and maintaining reliable software solutions that support complex business processes and data-intensive workflows.

Technology stack

C#, .NET, Entity Framework, ADO.NET, MS SQL Server, RESTful APIs, RabbitMQ, CI/CD pipelines, VSTO, WPF, WCF, Win Services, ASP.NET, MS Azure, and TeamCity

Responsibilities

Design and develop backend services using C# and .NET
Develop, support, and enhance WCF services to enable reliable internal and external system integrations
Implement and maintain RESTful APIs for internal and external integrations
Work with MS SQL Server using Entity Framework and ADO.NET
Develop and support desktop applications using WPF and VSTO
Integrate asynchronous messaging solutions using RabbitMQ
Collaborate with the team on architecture decisions and technical improvements
Participate in code reviews, contribute to code quality, and maintainability
Support CI/CD processes and ensure smooth delivery of new features

Requirements

Commercial experience with C# and the .NET platform
Hands-on experience developing VSTO-based solutions
Experience developing backend applications and RESTful APIs
Hands-on experience developing and maintaining WCF services
Strong practical experience with Entity Framework and ADO.NET
Practical knowledge of MS SQL Server and relational database design
Experience with WPF for desktop application development
Familiarity with message queues, preferably RabbitMQ
Understanding of CI/CD principles and automated delivery pipelines
Ability to work collaboratively in a team-oriented environment

Nice to have

Exposure to large-scale or enterprise-level systems
Experience in maintaining legacy applications alongside new development
Basic knowledge of application performance optimization and troubleshooting

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