Project info:For our client, we are seeking an experienced Senior Gen AI .NET Developer with proven hands-on experience in migrating production applications from .NET Framework to .NET 8 with practical Gen AI tools experience (including advanced usage of coding agents). The ideal candidate has extensive professional experience in C# and .NET, with a strong background in designing, developing, and maintaining .NET applications, particularly in API development and application modernization.Job Requirements:Overall 7+ years of professional experience in C# and .NET.Practical experience with advanced usage of coding agentsStrong hands-on experience with:Copilot agents, Claude Code or another Gen AI solution.NET Framework (4.x)ASP.NET MVC / Web APIASP.NET Core (.NET 6 / 7 / 8/10)Dapper or other ORM frameworkRedisNLog or modern logging frameworksSwagger / OpenAPI, JSON serialization and model bindingAPI Development and versioning strategiesFamiliarity with CI/CD pipelines (Azure DevOps, GitHub Actions, etc.)Experience deploying ASP.NET applications to IIS and/or cloud platformsWorking knowledge of certificates, secrets, and environment configurationComfortable working with automated test suites and quality gatesExperience in integrating AI-driven solutionsMigration-Specific ExperienceDemonstrated experience migrating applications from .NET Framework to .NET Core / .NET 8Strong understanding of:Dependency Injection patterns across Framework and CoreConfiguration models (Web.config vs appsettings.json)Middleware and request pipeline differencesAbility to decompose migration work into small, safe PRsMust possess a legal work permit in PolandBenefits:General benefits - depends on the form of employment Hybrid work model / remote work Attractively located office with collaboration spacesOnsite parking space for employeesReferral program with financial bonus Life Insurance Budget for development (including language courses and others), clear career path with the possibility to gain experience in international environment Access to internal Learning Platform with multiple trainings oriented for professional growth Lifestyle benefits: Access to MyBenefit platform (Multisport included)Team Building activities Charity initiatives Working environment promoting diversity and inclusion Health benefits: Private medical care - Platinum Package