Senior .NET Backend Engineer (Hybrid)

GFT Technologies SE; Polska; Hybrid; PLN 172,000 - 207,000; Full time

Benefits offered by this job

Hybrid work model

Career growth opportunities

Job summary

GFT Technologies SE Poland is seeking a backend engineer to design, develop and maintain scalable services in .NET/C# within distributed cloud-native environments. You will own end-to-end delivery in Agile teams, collaborating with architects, DevOps and QA to ensure high-quality and secure systems.

You will implement REST APIs, work with messaging systems (RabbitMQ/Kafka), contribute to CI/CD and observability, and mentor junior engineers while following SOLID and test-driven practices.

Qualifications

• Min. 5 years of commercial experience with .NET and C#.
• Strong knowledge of OOP, SOLID principles and clean code.
• Experience with ASP.NET Core.
• Asynchronous and multithreaded programming.
• Experience building RESTful APIs and distributed systems.
• Knowledge of event-driven architecture and messaging tools (RabbitMQ, Kafka, Azure Service Bus).
• Experience with dependency injection and backend frameworks.
• Experience with CI/CD pipelines and Git-based workflows.
• Experience with automated testing frameworks (xUnit, NUnit, FluentAssertions).
• Understanding of testing strategies (unit, integration, contract tests).
• Knowledge of relational databases and Entity Framework Core.
• Ability to write efficient SQL queries and debug data issues.
• Familiarity with logging and monitoring tools.
• Strong problem-solving skills and ability to work independently.
• Experience working in Agile/Scrum teams.
• Good command of English.

Responsibilities

• Design and implement backend services and REST APIs using .NET/C#.
• Develop production-ready solutions in distributed and cloud-native architectures.
• Plan and execute development tasks independently.
• Contribute to technical design and architecture discussions.
• Write and maintain technical documentation and design notes.
• Perform code reviews and ensure adherence to engineering standards.
• Build and maintain automated tests (unit, integration, API).
• Troubleshoot and resolve application and integration issues.
• Participate in Agile/Scrum ceremonies.
• Support CI/CD pipelines and deployment processes.
• Implement monitoring, logging and observability practices.
• Work with asynchronous processing and messaging systems.
• Share knowledge and support junior engineers.

Skills

NET/C#

OOP SOLID

ASP.NET Core

Async programming

REST APIs

Messaging

CI/CD pipelines

Unit testing

SQL & EF Core

Logging & monitoring

Agile/Scrum

English

Tools

RabbitMQ

Kafka

Azure Service Bus

Docker

Kubernetes

Git

EF Core

Job description

GFT Technologies SE Poland is seeking a backend engineer to design, develop and maintain scalable services in .NET/C# within distributed cloud-native environments. You will own end-to-end delivery in Agile teams, collaborating with architects, DevOps and QA to ensure high-quality and secure systems.

You will implement REST APIs, work with messaging systems (RabbitMQ/Kafka), contribute to CI/CD and observability, and mentor junior engineers while following SOLID and test-driven practices.