Hybrid .NET Full-Stack Engineer (REST & UI)

System One; Schaumburg (IL); Hybrid; USD 89,250 - 120,750; Full time

Benefits offered by this job

Health and welfare benefits including

401(k) plan

Job summary

System One is seeking a Full-Stack .NET Application Engineer in Schaumburg, IL for a contract-to-hire role. The position blends backend work (60%) with frontend tasks (40%), in a hybrid onsite/remote setup.

You will design, develop, and maintain large-scale .NET applications, supporting ELD workflows, while integrating modern UI and cloud-based practices. Collaboration and strong communication are essential.

Qualifications

• Strong experience with .NET / .NET Core and C#.
• Hands-on experience with EF Core and ORM best practices.
• Proven experience designing RESTful APIs and microservices architectures.
• Solid understanding of object-oriented programming (OOP), design patterns, and clean architecture principles.
• Experience with SQL Server or other relational databases, including query optimization, indexing, and stored procedures.
• Familiarity with authentication and authorization mechanisms (OAuth, JWT, identity frameworks).
• Experience with modern JavaScript frameworks (Angular, React, Vue, etc.).
• Angular strongly preferred; candidates without Angular experience must demonstrate ability to ramp quickly.
• Strong proficiency in: TypeScript, JavaScript (ES6+), HTML5, CSS3, responsive design principles, component-based UI architectures, familiarity with UI libraries like Angular Material or Bootstrap.
• Modern engineering practices including using Git, CI/CD pipelines, containerization (Docker), and cloud platforms (Azure preferred).
• Exposure to or experience with AI-assisted development tools such as GitHub Copilot is a plus.
• Ability to work independently and within a team, with strong communication skills.
• Knowledge of microservices, distributed systems, event-driven architectures, and API gateways is a plus.
• Prior experience in insurance or underwriting systems and legacy system modernization initiatives is desirable.

Responsibilities

• Design, develop, and maintain full-stack applications using .NET / .NET Core, C#, RESTful APIs, and modern UI frameworks, primary focus on backend development (~60%) and significant frontend responsibilities (~40%).
• Maintain and enhance existing ELD (Executive Liability Division) applications, frameworks, and shared libraries.
• Design and implement new features aligned with ELD business processes and workflows.
• Troubleshoot production issues and provide ongoing application support.
• Ensure compliance with security, performance, and architectural standards.
• Contribute to modernization initiatives, including framework evolution and technical debt reduction.
• Collaborate with cross-functional teams to define, design, and deliver high-quality solutions.
• Participate in code reviews, testing, CI/CD, and deployment processes.

Skills

NET Core

C#

EF Core

RESTful APIs

Microservices

OOP

Design patterns

Clean architecture

SQL Server

ORM

OAuth

JWT

Identity frameworks

Angular

React

Vue

TypeScript

JavaScript

HTML5

CSS3

Responsive design

Angular Material

Bootstrap

Git

CI/CD

Docker

Azure

GitHub Copilot

Tools

Docker

Git

Azure

Job description

System One is seeking a Full-Stack .NET Application Engineer in Schaumburg, IL for a contract-to-hire role. The position blends backend work (60%) with frontend tasks (40%), in a hybrid onsite/remote setup.

You will design, develop, and maintain large-scale .NET applications, supporting ELD workflows, while integrating modern UI and cloud-based practices. Collaboration and strong communication are essential.