C# Developer

TEKsystems

📍 Chicago, IL, United States

Full-time other-general Posted June 04, 2026

Job Description

Location: Onsite (5 days/week)
Type: Contract-to-Hire
Role Overview
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.

Core Responsibilities

+ 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 v...