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 developer with experience building scalable and secure backend services and clean, user-friendly frontend applications. Experienced working with microservices, designing API’s and working across a range of different serverless databases. Skilled at writing clean and testable code, 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 backend microservices in .NET and frontend applications in Vue. Design API’s and user facing applications. Build and maintain end-to-end BDD integration tests. Optimize database access using Entity Framework Core. Assist the rotating support schedule by reviewing logs, troubleshooting production issues and communicating findings with stakeholders. Key Requirements:Backend Skills Modern .NET/C# – Developing high-performance backend services and APIs in .NET 8 and 10 Entity Framework (EF Core) – ORM for data modeling, LINQ queries, migrations, and database optimization gRPC Services – Implementing high-throughput, low-latency communication between distributed services Frontend Skills JavaScript/TypeScript – Experience building SPAs with Vue.js API Integration – Consuming REST and gRPC services Database & Cloud Relational Databases – Serverless MySQL (Aurora) with EF Core NoSQL - DynamoDB Cloud Platforms – AWS deployment, containerization with Docker & Kubernetes Distributed queues – SQS and SNS Other Technical Skills Version Control: Git / GitLab CI/CD Pipelines: GitLab , Octopus Testing: Integration- and unit testing in .NET, Agile/Scrum methodology Nice to haves Node.js / Express – Building RESTful APIs, middleware, and microservices Authentication & Authorization – Experience with OAuth2, OpenID Connect, JWT, IdentityServer BDD-testing using Gherkin and .NET