Full Stack .NET Developer

Peterson Technology Partners; Chicago (IL); On-site; USD 146,000 - 187,000; Full time

Job summary

Peterson Technology Partners in Chicago is seeking a hands-on Full Stack .NET Developer to modernize an enterprise application from a Windows desktop to a web-based platform using Next.js, React, TypeScript, .NET Core, Web APIs, and SQL Server. You will work with the Lead Developer to accelerate delivery across frontend, middleware, and backend layers.

This contract role requires 10+ years in software development, strong React/Next.js/TypeScript skills, .NET Core, REST APIs, and SQL Server

Qualifications

• 10+ years of software development experience, preferably in full-stack web applications.
• Strong hands-on experience with React, Next.js, and TypeScript.
• Proficiency in .NET Core / ASP.NET Core and RESTful APIs.
• Experience with Microsoft SQL Server and relational databases.
• Ability to work across frontend, middleware/API, and backend layers.

Responsibilities

• Develop and enhance a modern web app using Next.js, React, and TypeScript.
• Build and maintain backend services and APIs with .NET Core.
• Develop middleware and integrations between web app, APIs, and database.
• Design and optimize SQL Server queries and procedures.
• Collaborate with Lead Developer and team on architecture and standards.
• Participate in code reviews, debugging, and performance improvements.
• Translate requirements into scalable technical solutions.
• Deliver end-to-end functionality across frontend, API, and backend.

Skills

React

Next.js

TypeScript

ASP.NET Core

REST APIs

Full-stack

Tools

Microsoft SQL Server

Job description

Our client are seeking a Full Stack .NET Developer to join a development team supporting the modernization of a long-standing enterprise application. The current Windows desktop application is being transformed into a modern web-based platform using Next.js, React, TypeScript, .NET Core, Web Services/APIs, and Microsoft SQL Server.

The successful candidate will work closely with the Lead Developer and existing development team to accelerate development of the new platform. This is a hands-on development role requiring strong full-stack capabilities and the ability to work across the frontend, middleware/API, and backend layers.

The developer will primarily focus on building foundational functionality around various specification types, templates, properties, quality assurance components, and related technical specification data.

Key Responsibilities

• Develop and enhance a modern web application using Next.js, React, and TypeScript.
• Build and maintain backend services and APIs using .NET Core.
• Develop middleware and integrations between the web application, APIs, and database layer.
• Design, develop, and optimize Microsoft SQL Server queries, stored procedures, and database interactions.
• Build foundational application functionality related to specification types, templates, properties, and QA components.
• Translate business and application requirements into scalable technical solutions.
• Work across frontend, middleware, and backend layers to deliver end-to-end functionality.
• Collaborate closely with the Lead Developer and existing development team on architecture, development standards, and implementation.
• Participate in code reviews, troubleshooting, debugging, and performance improvements.
• Communicate effectively with technical team members to understand requirements, discuss challenges, and arrive at solutions.
• Contribute to rapid development and delivery of new application functionality.

Required Skills & Experience

• 10+ years of software development experience, preferably in full-stack web application development.
• Strong hands-on experience with React.
• Strong hands-on experience with Next.js.
• Proficiency in TypeScript.
• Strong experience with .NET Core / ASP.NET Core.
• Experience developing RESTful APIs and web services.
• Strong experience with Microsoft SQL Server and relational databases.
• Demonstrated ability to work across frontend and backend technologies.
• Strong debugging, problem-solving, and analytical skills.
• Excellent verbal and written communication skills.
• Ability to work effectively with a Lead Developer and distributed development team.

Preferred Qualifications

• Experience modernizing or migrating desktop applications to web-based platforms.
• Experience working with complex, established enterprise applications.
• Experience working in an Agile/Scrum development environment.
• Familiarity with application architecture, reusable components, and API-driven development.
• Experience working with large or long-standing codebases.

What We're Looking For

The ideal candidate is a strong hands-on full-stack developer who is comfortable moving between frontend and backend development. While specific manufacturing or industry experience is not required, candidates should be able to quickly understand an established application and contribute to a complex development effort.

Strong communication and collaboration skills are particularly important. The developer will work closely with the Lead Developer, and the ability to clearly discuss technical requirements, challenges, and solutions will be critical to success.

Salary/Rate: $70-$90/HR (depends on experience level). This is a contract position with candidates expected to work 40 hours/ week.

About The Company

Peterson Technology Partners (PTP) is an Equal Opportunity Employer committed to creating a transparent, inclusive, and human-centered hiring experience.

For more than 28 years, PTP has operated as one of the top IT staffing and recruiting firms in the USA—built on trust, long-term partnerships, and technical excellence.

Based in the Chicago suburb of Park Ridge, IL, our team of more than 500 employees and consultants is dedicated to:

Helping every client make the best hiring decisions possible

Matching professionals with the right IT jobs and career opportunities

As part of that commitment, we believe in providing clear information about how our hiring technologies work and how your data is used. The following section outlines our AI-assisted interview process and your rights as a candidate.

AI-Assisted Interview Experience (Pete & Gabi – Rebecca)

To provide a consistent, fair, and flexible experience for all candidates, we use AI-assisted tools to support parts of the interview process. This includes our proprietary AI platform Pete & Gabi, which includes AI recruiter Rebecca.

These AI hiring tools help us:

• Conduct recorded video interviews
• Transcribe interviews
• Summarize candidate responses
• Generate job-related insights
• Streamline communication and scheduling

Please note that:

The AI does NOT make hiring decisions; all decisions are made by our human recruiters, hiring managers, or client partners.

The AI does not evaluate facial expressions, emotions, or physical traits; it is used only to support fairness, consistency, and efficiency.

If you prefer a non-AI interview format, we will gladly provide an alternative.

Technical or Case Interviews (Role-Dependent):

When applying for certain tech jobs, you may participate in:

• A technical interview
• A case study
• A client-specific assessment

We will always explain what to expect in advance so you can prepare with confidence.

Human Review & Selection:

Every candidate's profile—including interviews, conversations, and assessments—is reviewed by experienced recruiters and hiring leaders.

AI insights may assist with organization and evaluation, but final decisions are always human-driven.

Your Rights as a Candidate:

At PTP, every candidate has the right to:

Request a non-AI interview path

Ask how your data is being used

Request access to transcripts or interview recordings

Request deletion of your AI-recorded interview

Receive clear, timely communication

Our goal is to ensure you feel respected, informed, and supported throughout your experience.

Our Commitment:

For more than 28 years, PTP has focused on putting people first—candidates, consultants, employees, and clients.

We're committed to a hiring process that is:

• Transparent
• Compliant
• Equitable
• Powered by innovative technology that enhances—not replaces—human judgment

Welcome to the future of hiring at Peterson Technology Partners.

We're excited to learn more about you.

Peterson Technology Partners is an Equal Opportunity Employer. All qualified applicants will receive consideration without regard to race, color, religion, national origin, gender identity, sexual orientation, disability, veteran status, or any other protected characteristic.