Java+C# - Development Lead

Dice; Columbus (OH); On-site; USD 120,000 - 150,000; Full time

Job summary

Everest Technologies is seeking an experienced engineer to migrate Java services to C#/.NET, ensuring parity with the original Java implementations. You will map Spring to ASP.NET Core and JPA/Hibernate to EF/Dapper, preserving REST endpoints and service contracts.

Candidates should demonstrate hands-on migration experience and a track record of shipping in both languages. Responsibilities include reviewing AI-generated drafts, validating edge cases, and building parity tests to confirm

Qualifications

• Deep, current Java development experience (8+ years).
• Strong C#/.NET expertise (5+ years) including .NET Core / .NET 6+ and ASP.NET Core Web APIs.
• Proven ability to migrate/port code between Java and C# with parity proof via tests.
• Experience shipping production code in both languages within recent years.
• Familiarity with mapping Java constructs to .NET equivalents and preserving service contracts.

Responsibilities

• Migrate Java services to C#/.NET, using AI drafts as a starting point and finishing by hand.
• Convert Spring patterns to ASP.NET Core, JPA/Hibernate to EF or Dapper, Maven to NuGet.
• Preserve REST endpoints, payloads, error handling, and config behavior post-migration.
• Review AI-converted output for correctness, edge cases, and parity with the Java source.
• Write or port tests to prove functional parity before and after migration.

Skills

Java

C#/.NET

Spring Boot

ASP.NET Core

REST APIs

Parity testing

AI-assisted coding

Tools

Docker

Kubernetes

AWS

Azure

MySQL

SQL Server

EF

Dapper

Job description

• Work across both Java and C# code in the IL4 codebase, moving between them as the work demands.
• Convert Java services to C# / .NET, using AI-generated first drafts as a starting point and finishing them by hand to the client& C# patterns.
• Review AI-converted output for correctness, missed edge cases, hallucinated APIs, and behavior drift between the Java original and the C# result.
• Map Java constructs to their .NET equivalents (Spring to ASP.NET Core, JPA/Hibernate or DAO/SQL to EF or Dapper, Maven to NuGet).
• Preserve service contracts: REST endpoints, payloads, error handling, and config behave the same after conversion.
• Write or port tests to prove functional parity before and after migration.

Must have qualifications:

• Deep, current Java: 8+ years production Java, current within the last 1-2 years. Spring Boot strongly preferred. Can read unfamiliar Java and explain what it does and why.
• Strong C# / .NET: 5+ years hands-on C# and .NET Core / .NET 6+, ASP.NET Core Web APIs, dependency injection, async/await.
• Real migration scars: Has personally converted or re-platformed code between different languages (not just a framework version upgrade inside one language) and can describe what broke and how they proved parity.
• Both languages current: Shipped production code in each within roughly the last two years, not one current and one from a decade ago.
• Parity discipline: Proves equivalence with automated tests, not visual inspection.

Nice to have

• Hands-on use of AI coding tools for conversion or large refactors, with an honest view of where they fail.
• Interest in building the conversion harness: prompt templates, pattern libraries, parity test frameworks.
• Docker/Kubernetes, AWS or Azure, API gateways (Kong), MySQL and SQL Server