Mid-Senior Level .NET Engineer / Hybrid / Chicago, IL

This Chicago-based technology-driven online brokerage firm was founded by traders, for traders. They specialize in providing intuitive, customizable platforms for individual investors and financial professionals. Their deep-rooted history in the Chicago Board Options Exchange, commitment to innovation, and adherence to regulatory excellence have positioned us as a trusted name in online trading. As they continue to expand their trading infrastructure, they're seeking a skilled .NET Engineer with trading platform experience to join their team and help shape their next generation of greenfield solutions.

They are looking for a Mid-Senior .NET Engineer who is passionate about building high-performance trading systems from the ground up. The ideal candidate will bring hands-on experience with C#, .NET Core 8, microservices, and modern CI/CD practices. A strong background in trading systems is required, along with a track record of contributing to greenfield projects. Required Skills & Experience

• Design, develop, and maintain scalable microservices using C# and .NET Core 8.
• Contribute to the architecture and development of greenfield trading platform components.
• Build and optimize CI/CD pipelines using Jenkins and Git-based workflows.
• Integrate and manage MongoDB as part of a high-performance data layer.
• Collaborate with product managers, trading analysts, and QA to deliver robust, secure, and performant features.
• Ensure trading platform reliability, fault tolerance, and low-latency performance.
• Follow best practices in security, testing, and DevOps for production-grade software.
• Participate in code reviews and contribute to the continuous improvement of the engineering team.

What You Will Be Doing Tech Breakdown

• 85% new development
• 15% maintaince and enhancements

 Daily Responsibilities

• 5+ years of experience in software engineering with a focus on C# and .NET Core (v8 preferred).
• Strong experience in microservices design and implementation.
• Proven experience building trading systems or working within the financial trading industry.
• Solid understanding of MongoDB and NoSQL data modeling.
• Hands-on experience with CI/CD pipeline development using Jenkins.
• Experience with Git, REST APIs, and modern development tools.
• Familiarity with multithreading, performance tuning, and fault-tolerant system design.
• Prior involvement in greenfield projects from inception to deployment.
• Experience with Kubernetes or Docker.
• Background in financial compliance, market data feeds, or FIX protocol.
• Knowledge of front-end frameworks (e.g., React, Angular) is a plus.

Office Location 

• Chicago Loop, IL
• Hybrid
• 4 days onsite // 1 day WFH

The Offer

• Mid Level: $110-130K base
• Senior Level: $130-180K base

You will receive the following benefits:

• Medical Coverage
• Dental Coverage
• PTO
• 401K

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