Remote .NET Backend Engineer — GraphQL & DDD

Billennium; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Udemy for Business

Private medical care

Multisport card

Veterinary package

Language lessons

Shopping vouchers

Hybrid/remote work options

Welcome pack

Job summary

Billennium is a global technology company delivering advanced digital solutions. We seek a .NET Developer to join our team and support backend development for a life sciences client. You will build secure platforms, create Web APIs and GraphQL services, and contribute to clean code and robust testing in an Agile setting.

You will work on backend applications, implement features, and collaborate with engineers to deliver high-quality software for regulated environments.

Qualifications

• 3+ years of commercial .NET development experience.
• Strong knowledge of C#, .NET Core/7, and ASP.NET Core.
• Experience building backend REST APIs and GraphQL.
• Familiar with SQL Server and testing frameworks MSTest/NSubstitute.

Responsibilities

• Develop and maintain backend applications using .NET technologies.
• Implement new features and improve existing functionalities following Domain-Driven Design (DDD) principles.
• Build and maintain Web APIs and GraphQL-based services.
• Create and maintain unit and integration tests.
• Support application upgrades and modernization initiatives.
• Analyze and estimate development tasks.
• Participate in code reviews and contribute to improving code quality.
• Collaborate with developers, testers, and business stakeholders in an Agile environment.
• Troubleshoot issues and optimize application performance.

Skills

C#

.NET Core/.NET 7

ASP.NET Core

REST APIs

GraphQL

SQL Server

Unit & Integration Testing

Git

AWS S3

DDD

Tools

MSTest

NSubstitute

CI/CD

Job description

Billennium is a global technology company delivering advanced digital solutions. We seek a .NET Developer to join our team and support backend development for a life sciences client. You will build secure platforms, create Web APIs and GraphQL services, and contribute to clean code and robust testing in an Agile setting.

You will work on backend applications, implement features, and collaborate with engineers to deliver high-quality software for regulated environments.