Senior Dot Net Migration Developer

Senior .NET Migration Developer (VB6 to Cloud & Oracle) Role Overview

We are looking for a Senior .NET Migration Developer with a specialized track record in legacy modernization. In this role, you will be the driving force behind refactoring and converting our legacy Visual Basic 6 (VB6) desktop applications into modern, scalable .NET (C#) cloud-native architectures.

You will work heavily in a multi-cloud environment utilizing both AWS and Azure, and you will be responsible for maintaining, optimizing, and creating highly performant database logic within our Oracle Database cluster via complex PL/SQL stored procedures.

Key Technical Stack Category Core Technologies Legacy Systems Visual Basic 6 (VB6), COM/ActiveX, Win32 API, ADO Modern Development .NET 8 / .NET Core, C#, ASP.NET Core Web API, EF Core Cloud Environments AWS (EC2, RDS, Lambda) & Azure (App Services, Functions, Key Vault) Database Oracle Database (19c+), PL/SQL, Stored Procedures, Packages, Triggers CI/CD & DevOps Git, Azure DevOps, AWS CodePipeline, Docker Core Responsibilities

• Legacy Code Analysis & Modernization: Reverse-engineer existing VB6 codebases, mapping out legacy business logic, COM dependencies, and database access layers to prepare them for transition to .NET.
• Modern .NET Development: Architect, design, and build secure, modular, and high-performing microservices or desktop/web applications in C# (.NET 8+).
• Database Engineering: Design, write, and optimize complex Oracle SQL queries and PL/SQL stored procedures, packages, functions, and triggers to handle high-volume data processing.
• Cloud Architecture & Deployment: Leverage both AWS and Azure services to host, monitor, and scale migrated applications. Ensure robust integration between cloud compute layers and our Oracle DB backend.
• API & Integration Design: Build secure RESTful APIs to facilitate seamless communication between newly migrated .NET systems and remaining legacy components.
• Technical Leadership: Partner with solution architects to define migration paths, establish coding standards for the rewrite, and perform deep-dive code reviews.

Required Qualifications & Experience

• Overall Experience: 8 or more years of professional software development experience, with a heavy focus on enterprise application development.
• Migration Track Record: Proven, hands-on experience refactoring or migrating legacy systems (specifically VB6 or classic ASP) into C#/.NET.
• Deep .NET Expertise: Mastery of C#, .NET Core/.NET 8, ASP.NET Web API, and dependency injection patterns.
• Oracle PL/SQL Mastery: Exceptional skills in Oracle Database development. You must have extensive experience writing complex stored procedures and diagnosing performance bottlenecks using execution plans.
• Dual Cloud Exposure: Practical experience working with core services in both AWS and Azure (e.g., identity management, serverless compute, and secure connectivity).
• Education: Bachelor s degree in Computer Science, Software Engineering, or equivalent practical experience.

Preferred/Nice-to-Have Skills

• Experience dealing with hybrid network connectivity between on-premises Oracle databases and public clouds (Azure ExpressRoute, AWS Direct Connect).
• Familiarity with automated migration tools or code-transpilation methodologies.
• Background in highly secure, high-transaction enterprise domains like healthcare or financial services.