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
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Support the breakdown of a legacy desktop application into modern backend services
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Architect and build backend components that align with the target architecture and established design patterns
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Team up with colleagues to shape scalable data access strategies for multi-tenant use cases
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Take part in code reviews and share technical insights to elevate overall code quality
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Examine legacy business logic to guarantee functional parity across newly delivered services
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Join architectural conversations and help sharpen technical direction across workstreams
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Diagnose and resolve issues that surface throughout the migration lifecycle
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Assist with deployment activities and help keep services running reliably in containerised environments
Requirements
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No less than 3 years of hands-on professional experience in backend .NET engineering within production systems
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Practical delivery of REST APIs consumed by a real frontend inside a team setting
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Exposure to containerised deployments, including having released services running on Docker
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Assured, production-grade command of C# and ASP.NET Core (Current)
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Applied experience with Entity Framework Core, covering migrations, global query filters, and optimistic concurrency
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Working knowledge of OAuth 2.0 and OIDC server-side flows through Microsoft.Identity.Web, along with JWT validation and tenant middleware
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Background with Docker spanning multi-stage builds, secrets handling, and CI image gates
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Hands-on experience with xUnit and Testcontainers, with the ability to author meaningful integration tests against a real database
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Solid VB.NET reading comprehension, with the ability to interpret and reason about legacy VB.NET code without needing to write new VB.NET
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Confident English communication at B2 level or higher, both written and spoken
Nice to have
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Background with PostgreSQL, including schema design, indexing, and multi-tenant data patterns
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Awareness of Helm for handling Kubernetes application deployments
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Working understanding of Kubernetes for container orchestration and service operations
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Applied familiarity with OAuth2 for securing modern web applications and APIs
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Prior exposure to Visual Basic .NET for reading or maintaining legacy components
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Familiarity with XBRL for structured business reporting scenarios
We offer
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International projects with top brands
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Work with global teams of highly skilled, diverse peers
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Healthcare benefits
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Employee financial programs
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Paid time off and sick leave
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Upskilling, reskilling and certification courses
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Unlimited access to the LinkedIn Learning library and 22,000+ courses
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Global career opportunities
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Volunteer and community involvement opportunities
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EPAM Employee Groups
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Award-winning culture recognized by Glassdoor, Newsweek and LinkedIn
