Senior .NET Engineer​/C++​/Fintech​/Trading​/Hybrid​/Chicago, IL

Senior .NET Engineer / C++ / Fintech / Trading / Hybrid / Chicago, IL

This online brokerage and trading-technology firm offers a professional-grade trading platform for retail and institutional traders. Their customizable dashboard lets users build their own layout with flexible blocks for charts, quotes, option chains, and orders, enabling traders to tailor the interface to their workflow.

We are looking for a highly skilled Senior .NET Engineer with strong experience building high-performance, real-time applications in the fintech or trading domain. In this role you will design, develop, and optimize mission‑critical systems that support trading workflows, pricing engines, market data processing, and other financial operations.

• 5–7+ years of professional software engineering experience
• Strong proficiency in C#, .NET Core, and API/service development
• Hands‑on experience with C++ in performance‑critical applications
• Strong SQL skills and experience working with relational databases (SQL Server, Postgre
  
  SQL, etc.)
• MUST HAVE experience in fintech, trading systems, market data, or financial services
• Solid understanding of multithreading, concurrency, and distributed system design
• Experience in real‑time or low‑latency application development is a strong plus

• 30% maintenance, 70% new development

• Design, develop, and maintain backend services and trading‑related applications using C# and .NET Core
• Build high‑performance components and low‑latency modules in C++ to support pricing, execution, and market data processing
• Develop and optimize SQL database structures, queries, and procedures for large‑scale financial datasets
• Collaborate with product managers, quantitative teams, and Dev Ops to deliver reliable and scalable trading systems
• Integrate with market data providers, order‑routing systems, or financial APIs as needed
• Implement best practices for secure, compliant, and fault‑tolerant fintech applications
• Troubleshoot performance bottlenecks and production issues within distributed, real‑time environments
• Contribute to architecture decisions, code reviews, and continuous improvement initiatives

• Chicago Loop, IL – Hybrid (4 days onsite, 1 day WFH)

• $150–180 K base

• Medical Coverage
• Dental Coverage
• 401K
• PTO

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

Posted By:
Caitlin Carrion