Senior .NET Engineer

Description

Summary: Join a migration team as a Senior .NET Engineer to break down a legacy VB.NET desktop application into modern ASP.NET Core backend services running on Kubernetes. Highlights: 1. Contribute to the migration of legacy applications to modern services 2. Architect and build backend components adhering to target architecture 3. Collaborate on scalable data access strategies for multi-tenant use cases We are searching for a **Senior .NET Engineer** to become part of the migration team, contributing to the breakdown of a .NET Framework 4\.8 / VB.NET desktop application into ASP.NET Core (Current) backend services running on Kubernetes. The engagement kicks off with the project's highest\-risk element — profiling and replacing a 14,518\-line VB.NET data layer with EF Core repositories against a multi\-tenant PostgreSQL schema secured by Row\-Level Security — and then extends across backend services depending on team allocation. All services follow the same consistent patterns throughout: ASP.NET Core, EF Core, PostgreSQL, JWT tenant middleware, Docker, Kubernetes manifests. **Responsibilities** * Support the breakdown of a legacy desktop application into modern backend services * Architect and build backend components that align with the target architecture and established design patterns * Team up with colleagues to shape scalable data access strategies for multi\-tenant use cases * Take part in code reviews and share technical insights to elevate overall code quality * Examine legacy business logic to guarantee functional parity across newly delivered services * Join architectural conversations and help sharpen technical direction across workstreams * Diagnose and resolve issues that surface throughout the migration lifecycle * Assist with deployment activities and help keep services running reliably in containerised environments **Requirements** * No less than 3 years of hands\-on professional experience in backend .NET engineering within production systems * Practical delivery of REST APIs consumed by a real frontend inside a team setting * Exposure to containerised deployments, including having released services running on Docker * Assured, production\-grade command of C\# and ASP.NET Core (Current) * Applied experience with Entity Framework Core, covering migrations, global query filters, and optimistic concurrency * Working knowledge of OAuth 2\.0 and OIDC server\-side flows through Microsoft.Identity.Web, along with JWT validation and tenant middleware * Background with Docker spanning multi\-stage builds, secrets handling, and CI image gates * Hands\-on experience with xUnit and Testcontainers, with the ability to author meaningful integration tests against a real database * Solid VB.NET reading comprehension, with the ability to interpret and reason about legacy VB.NET code without needing to write new VB.NET * Confident English communication at B2 level or higher, both written and spoken **Nice to have** * Background with PostgreSQL, including schema design, indexing, and multi\-tenant data patterns * Awareness of Helm for handling Kubernetes application deployments * Working understanding of Kubernetes for container orchestration and service operations * Applied familiarity with OAuth2 for securing modern web applications and APIs * Prior exposure to Visual Basic .NET for reading or maintaining legacy components * Familiarity with XBRL for structured business reporting scenarios **We offer** * International projects with top brands * Work with global teams of highly skilled, diverse peers * Healthcare benefits * Employee financial programs * Paid time off and sick leave * Upskilling, reskilling and certification courses * Unlimited access to the LinkedIn Learning library and 22,000\+ courses * Global career opportunities * Volunteer and community involvement opportunities * EPAM Employee Groups * Award\-winning culture recognized by Glassdoor, Newsweek and LinkedIn