Senior .NET Developer/Hybrid/Delaware/$140k

Kelly Services

📍 New Castle, DE, United States

Full-time other-general Posted June 15, 2026

Job Description

$130000 - $140000
A large, Biotech company, is adding multiple Senior developers for their team in New Castle, Delaware. The company manufactures biotech instruments and has been doing so for multiple decades. Candidates should have strong experience building RESTful web services and APIs within C#/.NET web applications. Additional experience building frontend components with JavaScript, Typescript and React are pluses for this role.

This is a great opportunity to join a well-known organization in their industry and build cutting edge applications for the biotech industry. This position is fulltime/direct hire, and is hybrid (3 days per week) in New Castle, Delaware.

**Required Skills & Experience**

+ 5+ years building web based, C#/.NET applications (.NET 8 is preferred)
+ Ability to build and consume Restful APIs
+ Strong SQL Server skills
+ Bachelor’s degree in computer science or equivalent STEM field

**Desired Skills & Experience**