.NET Developer (with Java experience)

📍Contract of Employment

📍Gliwice - hybrid (50%)

📍17.000 - 21.000PLN gross monthly

Position Overview

We are seeking a .NET Developer to join a backend team responsible for building and enhancing systems that support business operations, integrations, and data processing in our client’s international environment.

This role focuses mainly on .NET technologies while offering opportunities to collaborate within a broader ecosystem that also includes Java-based solutions.

What You’ll Be Working On

Developing, maintaining, and optimizing backend applications built on .NET to ensure high performance and reliability

Designing and implementing APIs that meet business and technical expectations

Analyzing requirements and delivering new features, improvements, and system enhancements

Supporting and expanding existing solutions

Creating and managing integrations with internal and external systems

Troubleshooting issues, performing root-cause analysis, and ensuring long-term stability

Cooperating with distributed teams across locations such as Poland and Germany

Participating in code reviews and shaping coding standards and best practices

Preparing and maintaining clear, structured technical documentation

Supporting deployment processes and contributing to CI/CD pipelines

What We Expect From You

At least 3 years of professional experience in .NET development

Strong command of C#

Experience with Java and readiness to work in a combined .NET + Java ecosystem

Experience in backend development and API creation

Working knowledge of relational databases

Familiarity with Git

Experience in Agile/Scrum teams

Strong communication skills and readiness to collaborate in an international setting

English at B2 level or higher

Technology Environment

.NET (including .NET Framework, .NET Core, .NET 5+)

C#

REST APIs

Git

Databases such as MS SQL Server, SQLite, PostgreSQL

CI/CD tools and pipelines

Hays Poland sp. z o.o. jest agencją zatrudnienia zarejestrowaną w rejestrze prowadzonym przez Marszałka Województwa Mazowieckiego pod numerem 361.