Senior .NET Engineer — Build Scalable Web Apps

Collasys LLC; Shiremanstown (PA); On-site; USD 95,000 - 125,000; Full time

Job summary

Collasys LLC in Shiremanstown, PA is seeking a Senior .NET Developer to join our on-site team. The ideal candidate will have extensive experience with .NET, C#, VB.NET, ASP.NET, MVC, and Web API, and will contribute to architecture, design, and development of high-performance applications.

Responsibilities include designing scalable systems, implementing clean C# code, optimizing performance, and mentoring peers. This role is full-time, on-site, with collaboration across internal teams.

Qualifications

• Proficiency in .NET, C#, VB.NET.
• Experience with ASP.NET, MVC, and Web API.
• 10+ years of .NET development experience in a professional setting.
• On-site role in Shiremanstown/Mechanicsburg area.

Responsibilities

• Architecture, design, build, and maintain efficient .NET applications.
• Write clean, scalable C# code following SOLID design patterns.
• Identify bottlenecks, debug, and refactor to improve performance.
• Mentor teammates and contribute to code reviews.
• Collaborate with requirements analysis and internal teams.

Skills

.NET

C#

VB.NET

ASP.NET

MVC

Web API

Tools

RESTful APIs

Entity Framework

SQL

Angular

React

JavaScript

Job description

Collasys LLC in Shiremanstown, PA is seeking a Senior .NET Developer to join our on-site team. The ideal candidate will have extensive experience with .NET, C#, VB.NET, ASP.NET, MVC, and Web API, and will contribute to architecture, design, and development of high-performance applications.

Responsibilities include designing scalable systems, implementing clean C# code, optimizing performance, and mentoring peers. This role is full-time, on-site, with collaboration across internal teams.