We are Looking for a skilled Fullstack . net Developers for a fully remote B2B contract . Main responsibility will be developing  and delivering  high-quality software solutions, collaborate with stakeholders, and drive technical excellence. The ideal candidate will have expertise in cloud-native technologies, agile development, and modern application frameworks. Location : Poland - RemoteLanguage : Polish and EnglishDuration- 12 monthsStart: ASAP  or Jan 2026 Key Responsibilities  Participate in the full software development lifecycle: design, analysis, prototyping, development, testing, and support  Collaborate with cross-functional teams in an Agile environment  Contribute to backend development and cloud-based enterprise applications  Apply design patterns, write unit tests, and optimize performance    Tech Stack & Skills Must-Have:  Solid experience with C# and .NET  Proficiency in SQL and relational databases  Object-Oriented Programming (C# / Java)  Experience in enterprise software development  Strong communication skills and ability to work independently  Agile development experience  Nice-to-Have:  Experience with Payroll systems or HCM applications  Familiarity with Azure, Kubernetes, Kafka  Knowledge of modern web technologies (HTML, CSS3, JSON, WCF)  Exposure to JavaScript frameworks (React, Angular)  Experience with fintech or payments software