Senior Fullstack Engineer (.NET + React)

SpyroSoft S.A. is developing business applications that support HR processes for a leading provider of ERP and HR solutions in the Polish market.

• Minimum 5 years of commercial experience as a Software Engineer
• Strong knowledge of C# and the .NET platform (.NET Framework, .NET Core)
• Strong experience with JavaScript, HTML, CSS, and React
• Good knowledge of SQL and relational databases (SQL Server, Azure SQL)
• Experience with Microsoft Azure or other cloud solutions
• Experience working in Scrum/Agile environments
• Knowledge of Git
• Good understanding of software design principles, patterns, and best practices
• Experience writing unit, integration, and automated tests
• Ability to write clean, maintainable, and well-structured code
• Strong analytical and problem-solving skills
• Ability to communicate effectively and collaborate with both technical and business stakeholders
• English proficiency at a minimum B1/B2 level
• Polish proficiency at a minimum B2 level

Nice to have:

• Experience with desktop applications using WinForms and/or WPF
• Experience with Azure DevOps and CI/CD processes
• Knowledge of TypeScript
• Experience with ERP, HR, or payroll systems
• Experience with REST APIs, third-party integrations, Entity Framework, SignalR, or microservices
• Experience using AI tools in day-to-day development workflows

• Develop and maintain full-stack applications using .NET and React
• Build and enhance backend services, APIs, and web interfaces
• Design and optimize SQL queries and database solutions
• Take ownership of delivered solutions, from technical design through implementation and testing
• Contribute to technical decisions and continuous improvement of the product
• Write clean, maintainable, well-tested code
• Collaborate with Product Owners, designers, and other engineers to translate business needs into technical solutions
• Participate in code reviews and knowledge sharing within the team