Top C# Jobs in Chicago, IL

Design and develop low latency, high-performance trading systems. Optimize code and solutions for hardware efficiency, ensuring seamless application integration.

Lead modernization of a 30-year-old Store Management System by reverse engineering EZC file-based platforms, migrating data and applications to PostgreSQL, and developing enterprise C/C++ software. Responsibilities include architecture, systems integration, APIs, ETL, performance optimization, troubleshooting, documentation, and maintaining business continuity. The role also applies AI-assisted development tools for code analysis, documentation, testing, and modernization while mentoring teams and supporting legacy and modern environments.

Design, implement, operate, and optimize ultra-low-latency electronic trading systems on Linux. Responsibilities include building distributed real-time systems, analyzing packet captures and core dumps, troubleshooting performance, using profiling and benchmarking tools, and optimizing networking, concurrency, throughput, and reliability. The role spans architecture through live production debugging and involves collaboration with developers, traders, and operations teams.

Build and validate reinforcement-learning tasks for AI agents exploring unfamiliar C repositories. Responsibilities include investigating runtime behavior, rewriting engineering questions, refining rubrics and foils, running validation workflows, documenting solutions, and addressing expert review. Work focuses on production systems such as PostgreSQL, Redis, OpenSSH, OpenSSL, and other foundational C codebases.

Leads hands-on full-stack development across architecture, implementation, testing, deployment, and support. Designs secure, scalable C#/.NET and Angular applications, cloud integrations, APIs, and data solutions on AWS. Guides developers, establishes engineering standards, manages CI/CD and automated testing, troubleshoots complex issues, and drives cloud optimization, security, and technical debt reduction. Collaborates with product, architecture, DevOps, analytics, and project teams while supporting migration of on-premises applications to AWS.

Lead a development team while remaining hands-on in full-stack engineering. Design, build, test, deploy, and support secure web applications using C#/.NET, Angular, databases, and AWS. Drive cloud migrations, architecture, CI/CD automation, application security, troubleshooting, performance and cost optimization. Mentor developers, establish engineering standards, lead technical delivery, and collaborate with product, data, DevOps, and architecture teams.

Lead end-to-end development of secure, scalable web applications and data solutions supporting clinical trial operations. Design frontend and backend components using C#/.NET, Angular, AWS, and relational or non-relational databases. Guide architecture, testing, deployment, CI/CD, security, cloud optimization, and regulatory compliance. Mentor developers, oversee technical delivery, troubleshoot complex issues, and lead migration and modernization of on-premises applications to AWS.

Develop and maintain ultra-low-latency C++ trading software for options market making. Responsibilities include building exchange connectivity for new markets, optimizing order execution algorithms, developing automated pricing systems, tuning performance, and supporting trading infrastructure. The role involves full lifecycle software development, automated testing, peer code review, and close collaboration with traders, quantitative researchers, FPGA engineers, data analytics, and UI developers.

Design, implement, test, and deploy low-latency trading strategies in modern C++. Collaborate with traders and researchers to build high-performance software driven by large-scale data and mathematical models. Apply expertise in parallel programming, distributed systems, networking, and performance analysis while contributing to architecture, Agile development, and potentially project or team leadership.

Design, develop, and optimize high-performance C++ components for trading platforms, focusing on low-latency systems, while collaborating with multiple teams and ensuring production reliability.

The C++ Developer will implement, test and deploy features for a high-frequency trading system, optimize performance, and debug issues.

The Software Engineer will participate in designing and implementing software solutions, collaborating with various stakeholders, writing code, and addressing development challenges.

Build and optimize high-performance C/C++ and Rust server applications and feed handlers for market data. Implement parsers, petabyte-scale processing tools, and low-latency, high-throughput optimizations. Collaborate on build/deploy/CI, monitoring, and ensure reliable feature rollouts.

Develop high-performance, low-latency trading systems for options market making, collaborating with traders and quants to enhance performance and trading infrastructure.

The role involves developing applications using .Net and SharePoint technologies, requiring a strong background in web application development and multiple programming languages.

As a Software Engineer at Akuna, you will develop trading systems using modern C++ technologies, implement Linux services, and collaborate with traders.

The position involves building and optimizing automated trading infrastructure, developing trading algorithms, and creating scalable applications in a team environment.

Design and develop massively parallel distributed database kernels for real-time analytics at terabyte and petabyte scale. Responsibilities include low-level C++ development, MPP query execution, SIMD and hardware optimization, distributed communication using MPI and RDMA technologies, database internals, vector indexing, in-database machine learning, performance tuning, architecture reviews, mentoring, and resolving scalability issues.

Design and develop low-latency, high-throughput distributed database kernels for massively parallel analytics. Responsibilities include query execution, columnar storage, transaction management, cluster coordination, hardware-aware optimization, SIMD vectorization, RDMA networking, in-database machine learning, vector indexing, performance tuning, architecture reviews, code reviews, mentoring, and resolving scalability issues.

Design, build, and maintain high-throughput, low-latency C++ systems for symbol resolution. Develop scalable APIs, participate in design/code reviews, monitor and troubleshoot production, champion best practices, and mentor teammates.

Design, implement, and maintain low-latency C++ applications for trading strategy execution, optimizing performance, and collaborating with traders and engineers.

The C# / .NET Developer will design and maintain middleware applications, build Shopify integrations, and support a mobile app backend in a remote work environment.

Design and evaluate performance engineering tasks for AI training/evaluation. Optimize runtime, compilers, memory, CPU/GPU and concurrency. Produce documented solutions, evaluate AI-generated code, and build evaluation frameworks and scoring rubrics while collaborating with researchers and SMEs.

Develop user interface components for ArcGIS Pro using C# and WPF, work in an agile team, and design software solutions for raster and imagery processing.

PrivateID seeks a Principal C++ Engineer with at least 10 years of experience to lead complex systems and scale their platform in a remote-first environment.