The client is a company providing accounting, auditing, and consulting services.Basic information:Location: 100% remote (from Poland)Rate: PLN 110-160/hour net + VATType of employment: B2B contractDuration: 12 months + extensionsRecruitment process: 2 stagesEnglish: B2Luxmed, MultiSport, equipment provided by the clientWe are looking for an experienced (Senior) Full Stack .NET Developer to join the Tax Innovation team, which focuses on standardizing and delivering enterprise-class applications and process automation for clientsProfile:- Minimum 4 years of experience in software development.- Very good knowledge of: .NET Core/.NET 6+, ASP.NET Core, C#, Web API.- Experience with Angular 2+ (version 16 preferred), React, or other SPA frameworks.- Knowledge of SQL Server, Entity Framework Core, MediatR (CQRS), SignalR.- Practical experience in creating unit and integration tests (xUnit)- Knowledge of DevOps tools: Azure DevOps, Docker, CI/CD- Experience with JWT, OpenAM, MassTransit, Azure Service Bus/EventHubs- Ability to work in a distributed team, good communication and independenceWelcome:- 6+ years of experience- Knowledge of design patterns (Clean Architecture, CQRS, Event-Driven Architecture)- Experience with Power BI REST API, Semantic Kernel, RAG pipelines- Knowledge of AI and agent orchestration technologies- Knowledge of GenAI tools (e.g., GitHub Copilot, Cursor)Responsibilities:- Development of web applications based on .NET and Angular- Creation of APIs (REST/GraphQL), integrations with external systems- Participation in daily team meetings, planning, and code reviews- Implementation of solutions based on modular monolith and microservices architecture- Working with CI/CD, Azure, Docker- Cooperation with support teams and participation in resolving production incidentsTeam: international Hays Poland sp. z o.o. is an employment agency registered in a registry kept by Marshal of the Mazowieckie Voivodeship under the number 361.