Top C# Jobs in Denver & Boulder, CO

The Senior Software Engineer develops and maintains Sports Trading applications using .NET and SQL Server, enhancing existing functions and providing technical guidance.

As a Software Engineer, you will design, develop, and deliver high-quality software, contribute to code reviews, monitor application performance, and ensure maintainability and consistency across products.

Design, implement, and optimize scalable backend software solutions. Collaborate with team members and uphold coding standards while troubleshooting and maintaining software performance.

Develop and optimize high-throughput C++ algorithms for remote sensor data exploitation (image analysis, detection, tracking). Prototype, integrate, and test software within government frameworks as part of an Agile team. Work full-time in-person in Boulder, CO and obtain/maintain DoD security clearance.

Develop, optimize, and integrate high-throughput C++ algorithms and multi-object tracking software for counter-UAS and remote sensing systems. Work in an Agile small-team environment to prototype, test, and deliver low-latency processing solutions within government frameworks.

Design, implement, and optimize high-performance C++ software to process OPIR and remote-sensor data for missile warning, detection, and tracking. Improve performance, scalability, and reliability within a large Linux codebase, participate in design and code reviews, support integration and testing, and collaborate with algorithm and systems teams in an Agile environment. Position is full-time, on-site in Boulder, CO and requires U.S. citizenship and the ability to obtain a DoD security clearance.

Develop, optimize, and maintain high-throughput C++ software for processing OPIR and remote sensing data on Linux. Lead small teams, implement algorithms for detection and tracking, improve performance and scalability, support integration/testing, participate in code reviews, mentor teammates, and work directly with customers through the software development cycle in an Agile environment.

The Senior C# Developer will lead AI enablement by transforming APIs into an Agent Mesh using C# and the MCP, ensuring secure AI interactions through Gravitee management.

Design, develop, and maintain C#/.NET web applications and services (REST/SOAP). Implement client-side features using MVC/JavaScript frameworks, optimize performance and memory/threading, perform SQL Server tuning, and write unit/integration tests. Translate business requirements into scalable, secure distributed solutions.

Design, develop, and maintain .NET/C# web applications and services (REST/SOAP). Build scalable, multi-threaded distributed systems; profile and optimize memory, threading, and performance; implement client-side features (MVC, JavaScript, Angular, Bootstrap); perform T-SQL and SQL Server performance tuning; create unit and integration tests; translate business requirements into technical designs.

Develop and maintain .NET-based web applications and services (REST/SOAP). Work on full-stack features using ASP.NET, WebAPI, client-side frameworks (Angular, jQuery, MVC), and SQL Server. Diagnose and optimize performance, threading, and memory usage. Implement secure, scalable, multi-threaded distributed systems, write unit/integration tests, and translate business requirements into technical designs.

Design, develop, and optimize .NET web applications and services using C#, ASP.NET, WCF/WF, Web API and REST/SOAP. Implement client-side features (Angular, jQuery, MVC), ensure security, perform DB tuning on SQL Server, write unit/integration tests, and resolve threading/memory/performance issues for scalable distributed systems.

Contribute to and optimize the performance of ClickHouse, assist with debugging, collaborate with teams, and engage with the open-source community.

Develop and maintain .NET Core trading systems for Linux with service-oriented architecture and multi-threaded processing. Implement async, lock-free structures and distributed systems, write unit and integration tests, optimize SQL queries, design data structures and algorithms, and work with communication protocols (SignalR, gRPC, HTTP). Use PostgreSQL, Docker, and AWS in the deployment stack.

Remote backend C# developer to build and optimize a high-load spot-exchange matching engine. Improve performance and API throughput, implement business features, write unit and integration tests, work with .NET Core and PostgreSQL on AWS, and apply multithreading, async, and distributed systems concepts.

Develop and optimize ultra-low-latency, high-performance trading infrastructure in modern C++. Implement and tune order execution, market data connectivity, multi-threaded systems, and risk modules. Profile and benchmark real-time systems, collaborate with quants and traders, and maintain robust, fault-tolerant continuous trading operations.

The Back End Software Engineer will design and build scalable services for a SaaS platform, collaborate with teams, and contribute to quality code and architecture discussions.

Lead a team to develop SaaS solutions while coding and mentoring engineers. Responsible for technical leadership and team management.

Design high-performance C++ libraries for automated PCB design challenges, mentoring peers and shaping technical direction while collaborating with experts in various fields.

Develop internal web applications using C# and Blazor, optimize SQL queries, integrate AI/ML models, and collaborate across teams.

Design, build, and maintain backend workflow orchestration and state management for analyzer integrations on the ECL platform. Modernize legacy .NET systems, ensure reliable event-driven operations, collaborate with integration, infrastructure, and QA teams, and preserve workflow behavior during knowledge transfer.

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, develop, implement, and analyze technical products. Conduct engineering evaluations and improve product quality. Requires a bachelor's degree and 6 years of experience.

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.

Lead a development team focused on data processing and statistical analysis, ensuring high-quality software development and complex report packaging for clients.