Senior.NET Consultant

About the Position

We are seeking a Senior.NET Consultant to design, develop, and maintain scalable backend services using.NET and C#. Join our team in Krakow, Lodz, Poznan, or Warsaw.

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

Requirements

• Min. 5 years of commercial experience with.NET and C#
• Strong knowledge of OOP, SOLID principles, and clean code
• Experience with ASP.NET Core
• Practical knowledge of asynchronous and multithreaded programming
• Experience building RESTful APIs and distributed systems
• Knowledge of event-driven architecture and messaging tools (e.g. 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

Nice to Have

• Experience with Azure or AWS
• Knowledge of Docker and Kubernetes
• Experience with microservices architecture
• Basic frontend knowledge (Angular, React, TypeScript)
• Familiarity with gRPC
• Experience in performance optimization and resiliency patterns
• Practical use of AI coding assistants (e.g. Copilot, ChatGPT)
• Knowledge of Spec-Driven Development
• Experience in BFSI domain

We Offer

• Hybrid work in one of our locations: Lodz, Poznan, Krakow, Warszawa, Wroclaw (2 office days per week)
• Competitive salary and benefits
• Ambitious projects, trainings, and tools you need to flourish
• Google Cloud Partner of the Year - for going above and beyond for customers

About the Company

We are GFT Poland. WE KNOW how to tackle complex issues with an innovative approach to deliver the highest value. Our reputation has been built around one simple rule: we do not overpromise, WE DELIVER. We deliver to our employees, clients, and partners. WE GROW as you grow, so investing in you is our business strategy. Caring for each other is our priority. WE CARE who you are, what you need, how you feel. WE CARE to smile, have fun, and develop as human beings.