Senior .NET / React Developer

TalentFish; Lisle (IL); Hybrid; USD 110,000 - 160,000; Full time

Job summary

TalentFish in Lisle, IL is seeking a Senior .NET/React Developer to join a major enterprise modernization initiative. You will transform legacy ASP.NET/Web Forms into .NET Core + React, build APIs, and strengthen architecture to support critical production systems.

This role requires working onsite in Lisle 4 days per week with a strong full-stack background and a collaborative, agile mindset. The ideal candidate has 5+ years in C# / .NET and 3+ years in ReactJS, plus practical CI/CD experience.

Qualifications

• 5+ years of hands-on C# / ASP.NET / .NET Core development.
• 3+ years of ReactJS experience.
• Experience modernizing legacy ASP.NET/Web Forms to .NET Core + React.
• Advanced SQL with complex queries and stored procedures.
• Unit testing and API testing.
• Strong understanding of OOP, SOLID, design patterns and refactoring.
• Git/GitFlow and Agile development experience.
• Experience with CI/CD and modern DevOps practices.
• Experience with Azure, Kubernetes, containerization, IaC, Telerik is a plus.

Responsibilities

• Modernize legacy ASP.NET/Web Forms apps into .NET Core + React.
• Build and expose APIs and strengthen application architecture.
• Support mission-critical systems and ensure stability.
• Collaborate with an established engineering team in a hybrid on-site setting.
• Contribute to CI/CD pipelines and DevOps practices.

Skills

C# / ASP.NET / .NET Core

ReactJS

SQL

Unit testing

API testing

OOP / SOLID / design patterns

Git / GitFlow

Agile development

CI/CD / DevOps

Azure

Kubernetes

Containerization

Infrastructure as code

Telerik

Tools

Kubernetes

Telerik

Job description

Senior .NET / React Developer | Lisle, IL | Hybrid Onsite

I'm hiring multiple Senior .NET / React Developers for a major enterprise application modernization initiative in Lisle, IL.

This is a strong opportunity for a senior full-stack developer who enjoys doing more than maintaining existing applications. You'll help modernize legacy ASP.NET applications into .NET Core + React, build APIs, improve application architecture, and support mission-critical systems.

Important: This position requires working onsite in Lisle 4 days per week. Please apply only if that schedule works for you.

What I'm looking for

• 5+ years of hands-on C# / ASP.NET / .NET Core development
• 3+ years of ReactJS
• Experience modernizing legacy ASP.NET/Web Forms applications to .NET Core + React
• Advanced SQL, including complex queries and stored procedures
• Unit testing and API testing
• Strong understanding of OOP, SOLID principles, design patterns and code refactoring
• Git/GitFlow and Agile development experience
• Experience with CI/CD and modern DevOps practices

Experience with Azure, Kubernetes, containerization, infrastructure-as-code and Telerik is a plus.

I'm particularly interested in developers who can work independently, collaborate well with an established engineering team, and understand how to modernize applications without compromising the stability of critical production systems.

Multiple positions are available.

If you're a strong .NET/React developer in the Chicagoland area and Lisle 4 days onsite works for you, I'd like to hear from you.

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