Principal C#/.NET Engineer

vTech Solution; Hamilton (NJ); On-site; USD 140,000 - 190,000; Full time

Job summary

vTech Solution is seeking a Principal C#/.NET Engineer to lead modernization of a large legacy system into a scalable .NET application. You will drive refactoring, define EF Core data architecture, and optimize APIs and batch processing in a mission-critical environment.

You will spearhead ASP.NET Core Web APIs, service layers, and code quality improvements, while mentoring engineers and upholding secure coding practices.

Qualifications

• 10+ years in C# and .NET Core/.NET 6/7/8/10.
• Strong expertise in EF Core, LINQ, async/await.
• Experience with REST APIs, PostgreSQL, and software architecture.
• Knowledge of Angular, TypeScript, Node.js.
• Experience with testing frameworks, Git, SonarQube, Docker, CI/CD, and AWS.

Responsibilities

• Refactor complex legacy-converted code into maintainable C#/.NET.
• Lead Entity Framework Core design, optimization, and migrations.
• Build and enhance ASP.NET Core Web APIs and service layers.
• Improve performance, scalability, and code quality.
• Define development standards and mentor engineers.
• Ensure strong testing, CI/CD, and secure coding practices.

Skills

C# / .NET

EF Core

LINQ

Async/Await

REST APIs

PostgreSQL

Software Architecture

Angular

TypeScript

Node.js

Testing Frameworks

Git

SonarQube

Docker

CI/CD

AWS

Tools

Docker

Git

SonarQube

AWS

Job description

Job Summary:

Seeking a highly experienced Principal C#/.NET Engineer to lead the modernization of a large legacy system into a clean, scalable, and high-performance .NET application. The role involves driving code refactoring, defining EF Core data architecture, optimizing APIs and batch processing, and ensuring delivery quality in a mission-critical environment.

Responsibilities

• Refactor complex legacy-converted code into maintainable C#/.NET
• Lead Entity Framework Core design, optimization, and migrations
• Build and enhance ASP.NET Core Web APIs and service layers
• Improve performance, scalability, and code quality
• Define development standards and mentor engineers
• Ensure strong testing, CI/CD, and secure coding practices

Required Skills & Certifications

• 10+ years in C# and .NET Core/.NET 6/7/8/10
• Strong expertise in EF Core, LINQ, async/await
• Experience with REST APIs, PostgreSQL, and software architecture
• Knowledge of Angular, TypeScript, Node.js
• Experience with testing frameworks, Git, SonarQube, Docker, CI/CD, and AWS

Preferred Skills & Certifications

• Legacy modernization experience
• Mainframe and batch processing knowledge
• Performance tuning in large-scale systems
• Experience in regulated, high-accuracy environments

Special Considerations

• Mission-critical environment requiring high delivery quality
• Strong emphasis on secure coding and testing practices
• In-person interview required

Scheduling

• 100% onsite for the first 30 days
• Then hybrid schedule: 3 days onsite / 2 days remote