Senior Fullstack Engineer (.NET + React)

Tech Stack:.NET Framework, .NET CoreJavaScript, HTML, CSS, and ReactSQL and relational databases (SQL Server, Azure SQL)Responsibilities:Develop and maintain full-stack applications using .NET and ReactBuild and enhance backend services, APIs, and web interfacesDesign and optimize SQL queries and database solutionsTake ownership of delivered solutions, from technical design through implementation and testingContribute to technical decisions and continuous improvement of the productWrite clean, maintainable, well-tested codeCollaborate with Product Owners, designers, and other engineers to translate business needs into technical solutionsParticipate in code reviews and knowledge sharing within the teamRequirements:Minimum 5 years of commercial experience as a Software EngineerStrong knowledge of C# and the .NET platform (.NET Framework, .NET Core)Strong experience with JavaScript, HTML, CSS, and ReactGood knowledge of SQL and relational databases (SQL Server, Azure SQL)Experience with Microsoft Azure or other cloud solutionsExperience working in Scrum/Agile environmentsKnowledge of GitGood understanding of software design principles, patterns, and best practicesExperience writing unit, integration, and automated testsAbility to write clean, maintainable, and well-structured codeStrong analytical and problem-solving skillsAbility to communicate effectively and collaborate with both technical and business stakeholdersEnglish proficiency at a minimum B1/B2 levelPolish proficiency at a minimum B2 level Nice to haveNice to have:Experience with desktop applications using WinForms and/or WPFExperience with Azure DevOps and CI/CD processesKnowledge of TypeScriptExperience with ERP, HR, or payroll systemsExperience with REST APIs, third-party integrations, Entity Framework, SignalR, or microservicesExperience using AI tools in day-to-day development workflowsProject Description:We are looking for an experienced Senior Full-Stack Software Engineer to join a team developing business applications that support HR processes for a leading provider of ERP and HR solutions in the Polish market. You will work across backend, frontend, and database layers, using .NET, React, and SQL to develop and evolve the product. Experience with desktop technologies such as WinForms or WPF will be an advantage due to parts of the existing solution using these technologies. You will collaborate with Product Owners, designers, and engineers, contribute to technical decisions, and help deliver solutions that address real business needs.