.NET Developer — Backend & REST API, Flexible Hours

Kruko; Łódź; On-site; PLN 110,000 - 165,000; Full time

Benefits offered by this job

Competitive employment conditions

Benefits package

Flexible working hours

Opportunities for professional growth

Job summary

Kruko is seeking a .NET Developer to design, build, and maintain backend and web applications using C# and .NET technologies. You will develop RESTful APIs, work with SQL databases, and collaborate with frontend and QA teams to deliver scalable solutions.

The role emphasizes clean code, testing, and continuous improvement, with opportunities to explore new technologies in a dynamic, international environment. English proficiency at B2 level is required.

Qualifications

• Solid experience with C# and .NET Framework / .NET Core
• Good understanding of MVC architecture and Entity Framework / EF Core
• Practical experience with SQL databases and query optimization
• Familiarity with frontend technologies, especially JavaScript and React
• Knowledge of REST API design and integration
• Experience using Git for version control
• Understanding of unit testing principles and best practices
• Teamwork skills and effective communication

Responsibilities

• Designing, developing, and maintaining backend and web applications using C# and .NET technologies
• Building and optimizing RESTful APIs for performance and scalability
• Implementing clean, efficient, and well-documented code
• Collaborating with project teams to define requirements and propose effective solutions
• Conducting testing, debugging, and maintenance of existing applications
• Integrating applications with databases and external services
• Researching and applying new technologies to continuously enhance our products
• Good command of English — minimum level B2

Skills

C#

.NET Framework / .NET Core

MVC architecture

Entity Framework / EF Core

SQL databases

JavaScript

React

REST API

Git

Unit testing

Teamwork

English B2

Tools

Entity Framework / EF Core

Git

CI/CD pipelines

Job description

Kruko is seeking a .NET Developer to design, build, and maintain backend and web applications using C# and .NET technologies. You will develop RESTful APIs, work with SQL databases, and collaborate with frontend and QA teams to deliver scalable solutions.

The role emphasizes clean code, testing, and continuous improvement, with opportunities to explore new technologies in a dynamic, international environment. English proficiency at B2 level is required.