Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.We are looking for a highly skilled Senior Fullstack .NET Developer with Angular to join our dynamic team focused on delivering next-generation digital platforms. The ideal candidate will have strong experience in full-stack development, cloud technologies, and modern software architectures, with a keen interest in leveraging AI to improve customer experience and engineering efficiency.Your tasks Analyze business, functional, and technical requirements for digital platforms, including Customer Experience and eCommerce Design, develop, and maintain robust, scalable applications as part of an Agile Scrum team Implement RESTful Web APIs and microservices to support application functionality Collaborate with front-end teams to deliver responsive, high-quality web interfaces Apply modern frameworks and tools to enhance development efficiency and maintainability Participate in cloud application development, particularly on Microsoft Azure Integrate DevOps processes and tools to support CI/CD and infrastructure management

Utilize AI-assisted development tools to increase productivity and code quality

Requirements At least 5 years of experience in C#/.NET development, including .NET Core, ASP.NET, and Entity Framework Strong front-end development skills using Angular 9+, TypeScript, RxJS, HTML, CSS, and SASS Hands-on experience with RESTful Web APIs and microservice architectures Proficiency with modern frameworks and tools such as GraphQL, Mass Transit, Autofac, Mapster, AutoMapper, FluentValidation, Apollo Angular, and Angular Material Experience in cloud development, especially Microsoft Azure Familiarity with DevOps processes and tools, including Azure DevOps, Terraform, PowerShell, and MACH Composer Solid understanding of Git, SOLID principles, design patterns, and software architecture best practices Experience using AI-assisted development tools and interest in leveraging AI for customer experience, automation, or engineering efficiency Fluency in English Residing in Poland required What we offer  Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas  Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market  We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022  Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more  Comfortable workplace – class A offices or remote work  Dozens of fascinating projects for prestigious brands from all over the world  PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers  Investment in your growth – meetups, webinars, training platform and technology blog – you choose  Fantastic atmosphere created by all Sii Power People  Join the Sii team – develop your skills, gain experience, and build your career!