Senior C# & .NET Backend Engineer — Remote

Fyerx; Poland; Remote; PLN 140,000 - 210,000; Full time

Benefits offered by this job

Remote work

Job summary

Fyerx is seeking a senior C#/.NET backend developer to architect and scale enterprise-grade services for internal and client platforms. You will design secure RESTful APIs, implement microservices, and drive cloud-ready solutions on Azure or AWS.

Collaborating with product and remote teams, you will optimize databases (MS SQL Server / PostgreSQL), enforce SOLID principles, implement CI/CD with Azure DevOps or GitHub Actions, and write comprehensive tests.

Qualifications

• 3+ years of professional C#/.NET development experience.
• Advanced proficiency in C# and the .NET ecosystem (Core, ASP.NET Core, EF Core).
• Strong understanding of MS SQL Server or PostgreSQL databases.
• Experience with cloud platforms (Azure/AWS) and containerization (Docker).
• Knowledge of SOLID, clean architecture, and maintainable code.

Responsibilities

• Architect, develop, and maintain high-performance C# and .NET Core backend services, enterprise applications, and internal automation tools.
• Design and implement secure, scalable RESTful APIs and microservices for internal and external platforms.
• Manage and optimize relational databases (MS SQL Server / PostgreSQL) for high throughput and data integrity.
• Collaborate with frontend engineers, product managers, and remote teams to translate requirements into scalable software.
• Implement enterprise security standards and oversee CI/CD pipelines (Azure DevOps/GitHub Actions) with comprehensive unit tests.

Skills

C# / .NET

Backend architecture

RESTful APIs

Microservices

Cloud platforms (Azure/AWS)

SQL databases

CI/CD

Secure coding

Tools

Docker

Azure DevOps

GitHub

Postman

Job description

Fyerx is seeking a senior C#/.NET backend developer to architect and scale enterprise-grade services for internal and client platforms. You will design secure RESTful APIs, implement microservices, and drive cloud-ready solutions on Azure or AWS.

Collaborating with product and remote teams, you will optimize databases (MS SQL Server / PostgreSQL), enforce SOLID principles, implement CI/CD with Azure DevOps or GitHub Actions, and write comprehensive tests.