C# Developer

Location

Location: Onsite (5 days/week)

Type: Contract-to-Hire

We are seeking a Senior Software Engineer to join a high-impact engineering team responsible for building and extending real-time, mission‑critical systems supporting portfolio valuation, pricing, and execution workflows in the capital markets space. This role focuses heavily on backend development, data integration, and scalable, multi‑threaded systems. You will work closely with technologists and business stakeholders to design, build, and enhance applications that ingest large volumes of external market data, perform complex calculations, and expose that data internally and externally with high reliability and performance.

• Design, build, and maintain backend services using C#/.NET
• Develop and optimize SQL Server data models and queries for large‑scale datasets
• Integrate data from multiple external sources (market data providers, third‑party vendors)
• Build and maintain multi‑threaded applications to support complex, real‑time calculations
• Contribute to system scalability, performance tuning, and operational stability
• Participate across the full SDLC: system design, development, testing, deployment, and support
• Collaborate in an Agile environment with engineers, product, and business stakeholders

• Advanced C# / .NET development experience (current environment on .NET Framework; future migration to .NET Core)
• Strong backend engineering experience with SQL Server and native SQL
• Experience handling large data sets and performance‑sensitive systems
• Proven expertise in multi‑threading, concurrency, and thread safety
• Experience building middle‑tier services at scale
• Hands‑on experience integrating with external systems using REST, SOAP, FIX, or secure file transfer
• Familiarity with real‑time systems (non‑batch, low‑latency processing)

Strong understanding of how financial products trade and are valued, including:

• Equities
• Fixed Income (Bonds, Treasuries, Structured Products)
• Derivatives (Options, Futures, Swaps - e.g., IRS, CDS, Equity Swaps)
• Foreign Exchange (FX)
• General knowledge of trading operations, portfolio management, and market structure
• Ability to discuss concepts such as pricing, fair value, volatility, and risk metrics

• Experience with Execution Management Systems (EMS) or Order Management Systems (OMS)
• Exposure to Portfolio Management or valuation platforms
• Knowledge of containerized applications and Kubernetes‑based deployments
• Familiarity with cloud‑native development (Google Cloud Platform, AWS, or Azure)
• Experience with messaging technologies (Kafka, Rabbit
  
  MQ)
• Experience with caching technologies (Redis, Hazelcast)
• Basic exposure to modern UI frameworks (HTML, React)
• Understanding of CI/CD, application resiliency, and security best practices

• Bachelor's degree in Engineering, Computer Science, Mathematics, or a related technical field (or equivalent experience)

• 5+ years of professional software engineering experience
• Demonstrated ability to build scalable, high‑performance systems in complex domains

• Initial 30‑minute introductory and background discussion
• Technical panel interview

Job Type &

Location:

Contract to Hire position based out of Chicago, IL

The pay range for this position is $80.00 - $100.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:

• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan - Pre‑tax and Roth post‑tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long‑term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

This is a fully onsite position in Chicago, IL.

This position is anticipated to close on Jun 3, 2026.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.