Senior Backend Engineer

We are looking for an experienced Senior Backend Software Engineer to design, build, and operate backend services within a modern, scalable microservices environment. The role involves working with ASP .NET Core, Azure Functions, SQL Server, and Azure CosmosDB to deliver high‑performance, secure solutions for cloud and hybrid environments. While this role focuses on cloud‑native development in Azure, our engineering teams also maintain on‑premise .NET platforms. Candidates with strong on‑prem experience are welcome to apply, as there are opportunities to contribute within that area as well. Key Responsibilities: End‑to‑end development of backend features using ASP .NET Core APIs, Azure Functions, SQL Server, and CosmosDBBuilding and extending .NET services in a microservices architectureImplementing resilient, asynchronous workflows using Azure Service BusDesigning secure and efficient data access patterns (SQL Server, CosmosDB)Ensuring multi‑tenant data isolation and compliance with security standardsUsing Azure services such as Service Bus, Blob Storage, App Configuration, Application Insights, and Entra IDWriting unit and integration tests (xUnit, Moq, FluentAssertions)Contributing to CI/CD pipelines (GitHub Actions, Azure DevOps)Working with Terraform, Docker Compose, and AzuriteIdentifying and resolving performance, security, and reliability issuesIndependently delivering backend features from design to productionParticipating in architecture discussions and code reviewsCollaborating with product and frontend teams on API designMentoring junior engineers and promoting AI‑driven development practices. Qualifications: Minimum 5 years of experience in backend or distributed systems engineeringStrong proficiency in C# / .NET 8/10, ASP .NET Core, Azure FunctionsExperience with SQL Server (T‑SQL, EF Core, RLS) and NoSQL databases (CosmosDB preferred)Practical knowledge of Azure services (Functions, Service Bus, Blob Storage, App Configuration, App Insights)Understanding of OAuth2, JWT, and identity provider integrationsExperience with multi‑tenant SaaS architecturesFamiliarity with asynchronous, message‑driven systemsKnowledge of CI/CD, Terraform, Docker/KubernetesStrong testing discipline and communication skills. Benefits: Hybrid work model with a modern office located in Kraków.Competitive health and wellness benefits.Career growth, technical advancement, and continuous learning opportunities.A collaborative, innovative, and supportive work environment.Joining newly built engineering teams Apply now! W celu złożenia aplikacji prosimy o kliknięcie przycisku „Aplikuj teraz“ i postępowanie zgodnie z instrukcjami. W przypadku wcześniejszych spotkań w firmie Grafton, prosimy o bezpośredni kontakt z konsultantem prowadzącym. Podane stawki wynagrodzeń są stawkami brutto, na podstawie badania wynagrodzeń Grafton Recruitment. Ostateczna wartość wynagrodzenia zależy od stopnia dopasowania kompetencji.