Back-End Developer (.NET / C#)

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Description

Location: Poland (approx. 90% remote, occasional on-site visits in Warsaw) Start Date: ASAP About the Role We are looking for experienced Back-End Developers to join a long-term software development project. You will be responsible for designing, developing, and maintaining backend applications, building APIs, optimizing databases, and ensuring high-quality software delivery within an Agile environment. Responsibilities Design and develop software based on technical requirements Build and maintain REST APIs Design, develop, and optimize relational databases Debug, test, and improve application performance Create unit and integration tests Collaborate with cross-functional teams in an Agile/Scrum environment Report progress and contribute to technical documentation Requirements Higher education degree Minimum 5 years of professional experience in IT projects At least 3 years of experience as a Back-End Developer within the last 5 years Strong knowledge of C# and .NET Core Experience developing web and desktop applications Practical experience designing and implementing REST APIs Good understanding of Clean Architecture and Domain-Driven Design (DDD) Strong knowledge of MS SQL and/or PostgreSQL Experience with SQL optimization, indexing, and stored procedures Hands-on experience with Entity Framework Core and Dapper Knowledge of authentication, authorization, and encryption mechanisms ( JWT, OAuth2, FIDO2 ) Experience writing unit and integration tests Familiarity with Azure De

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