PROJECT INFORMATION:Industry: BankingClient: A company from Sweden / start-up environmentRemote work: 100%Project language: EnglishBusiness trips: Occasionally to Sweden, maybe one per yearProject length: 12 months contracts + prolongationsStart: ASAP / Flexible - we are focused on finding the best candidateAssignment type: B2BRemuneration: 35-45 EUR/hLocalization in the organization: this consultant will be a part of a Core Development Team of 9 Full Stack Developers.The first challange and focus: on the customer service backoffice application (greenfield).Introduction & SummaryWe are seeking a Senior Full Stack .NET Developer with a proven track record in designing and implementing scalable, secure, and user-friendly applications. The ideal candidate will have extensive experience in both frontend and backend technologies, particularly with .NET 9/10, microservices, AWS (hybrid and serverless) and modern authentication mechanisms. A strong understanding of database optimizations and API design is essential for this role, along with the ability to deliver responsive user interfaces and robust backend services.Main ResponsibilitiesThe main duties of the Senior Full Stack .NET Developer include: Develop full stack applications utilizing Vue and React for the frontend and .NET Core for backend APIs. Develop and maintain microservices hosted on AWS cloud. Build and maintain REST and gRPC services for effective cross-system communication. Design and implement secure authentication and authorization flows (JWT, OAuth2, IdentityServer). Optimize database access and performance using Entity Framework Core. Collaborate closely with UX/UI designers and DevOps engineers to create scalable and efficient solutions. Key Requirements Strong experience with JavaScript/TypeScript, particularly in building SPAs with Vue.js and React. Experience with .NET 9+. Proficient in Entity Framework (EF Core) for data modeling and optimization. Knowledge of gRPC services for high-throughput, low-latency communication. Experience with relational databases, specifically MySQL, and NoSQL solutions like DynamoDB. Familiarity with cloud platforms, focusing on AWS, serverless functions, and containerization technologies such as Docker & Kubernetes. Proficient in version control systems (Git, GitHub, GitLab). Experience with CI/CD pipelines, particularly GitLab and Octopus. Understanding of testing methodologies, including Integration Testing and xUnit. Experience working within an Agile/Scrum methodology. Knowledge of authentication techniques such as JWT, OAuth2, and role-based access control. Nice to Have Experience with UI frameworks like Vuetify for creating Material Design-based responsive interfaces. Familiarity with state management tools, particularly Pinia for centralized state handling.