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
EPAM is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, sexual orientation, gender identity or expression, disability, protected veteran status, or any other characteristic protected by applicable law.
