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

at Kelly Services in New Castle, Delaware, United States

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

+ Excellent verbal and written communication skills

+ Prior experience working for a biotech company (plus)

What You Will Be Doing

Tech Breakdown

+ 20% Frontend development (JavaScript, React)

+ 80% Backend development (C#/.NET 8, REST, Entity Framework, SQL)

Daily Responsibilities

+ 100% Hands On

+ 50% Individual contribution

+ 50% Team Collaboration

The Offer

+ Competitive Salary + Benefits

You will receive the following benefits:

+ Medical, Dental, and Vision Insurance

+ Vacation Time

+ 401(k)

Applicants must be currently authorized to work in the US on a full-time basis now and in the future.

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Job Posting: JC292912202

Posted On: Jun 11, 2026

Updated On: Jul 06, 2026

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