Top Senior C# Jobs

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.

The Senior Full Stack .NET Engineer designs and maintains software systems, manages API integrations, and works closely with cross-functional teams to improve internal platforms and resolve production issues.

Design and maintain high-speed GPU-based simulation platform ensuring deterministic execution, low latency, and reproducibility at scale. Own interfaces to the self-driving stack, optimize performance, and build self-serve systems to accelerate ML and autonomy workflows while collaborating with ML experts to bridge fidelity gaps.

Design and optimize high-performance C++/CUDA libraries for GPU-based data processing. Improve multi-node GPU communication (UcxExchange), optimize Presto GPU query performance, and lead enhancements across Presto, Velox, and cuDF projects for efficient DataFrame and database acceleration.

Develop and optimize native C++ Android components for ground control stations, focusing on real-time telemetry, MAVLink communications, JNI boundaries, performance tuning, Qt/QML UI work, build systems, and field support to ensure reliable drone control across varied Android hardware.

Develop and maintain the Java client library and high-performance C/C++ server applications. Implement message parsers and feed handlers, optimize for extreme throughput and low latency, build tools for petabyte-scale processing, collaborate on build/deploy/CI practices, monitor uptime, and support smooth feature rollouts.

Implement and maintain the C# client library and high-performance C++ server applications. Build message parsers and feed handlers, optimize for millions of messages/second and nanosecond latency, develop petabyte-scale data tools, collaborate on build/deploy/CI/CD, monitoring, and ensure reliable feature rollouts.

Design and implement high-performance 2D/3D GIS visualization software and real-time rendering features. Research and apply advanced graphics algorithms, diagnose and fix bugs and performance issues, handle large data visualization and I/O caching, and collaborate with cross-functional teams to deliver quality software in an agile environment.

Senior C#/.NET developer role to design and implement enterprise-level, scalable microservices using AWS. Work with MS SQL/PostgreSQL and React.js, mentor developers, overlap multiple time zones, and grow into technical leadership in a fully remote environment.

The Senior Software Engineer will design, develop, and maintain software applications, lead coding efforts, mentor junior staff, and collaborate with cross-functional teams to align solutions with business goals.

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.

Develop, evaluate, and test safety-critical Orion GN&C flight software. Use MATLAB/Simulink/Stateflow/Autocode, Python, and C/C++ for analysis, simulation, integration, and build management. Improve software processes, perform deep-dive flight and simulation analyses, and collaborate with NASA and contractor teams.

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

Develop, enhance, and maintain backend web applications and services using C#/.NET. Implement features with ASP.NET, Entity Framework, and SQL Server; write unit and integration tests; perform troubleshooting, code reviews, vulnerability remediation, and O&M tasks while collaborating with senior engineers and cross-functional teams.

The Lead Software Engineer will design and implement secure APIs, develop complex web front-ends, and mentor junior engineers while ensuring high-quality software development and customer satisfaction.

Design, develop, and test high-fidelity real-time simulation software for SpaceX flight systems. Build core simulation infrastructure and models (fluids, electronics, multi-body physics), prototype designs, improve performance and reliability, and collaborate with engineering teams and users to add features and improve usability.

Design, develop, optimize and maintain high-performance C++ fintech applications and distributed microservices. Build low-latency, secure services integrating via gRPC and REST, tune Oracle databases, deploy on RHEL and container platforms, automate CI/CD, troubleshoot production incidents, and mentor junior engineers while collaborating with cross-functional teams.

Design, develop, test, and maintain enterprise C#/.NET applications and RESTful APIs. Optimize SQL Server and PostgreSQL databases, troubleshoot production issues, perform code reviews, mentor developers, and collaborate with QA/DevOps on CI/CD, containerization, and deployments within an Agile team.

Develop and maintain C/C++ software for Naval weapon systems (SLBM), following Agile and DevSecOps practices. Collaborate on architecture, requirements, testing, and integration; use Git, Jira, and static analysis tools. Support cross-functional teams, perform problem solving, and sustain professional development while meeting program schedules.

C# developer for fixed income/commodities front-office technology. Full SDLC with support responsibilities; build and maintain trading systems, databases, and UIs using .NET, DevExpress, messaging middleware, SQL Server/Sybase. Requires strong debugging/triage and communication skills. Unit testing and meta-programming, OpenLink/ETRM, and trading product knowledge are desired.

Lead C#/.NET Developer to design and implement healthcare-focused software and integrations. Responsibilities include C#/.NET development, SOAP/REST services, PowerShell automation, HL7/CCD/CCR healthcare interchange, ETL/MDM using Informatica, Oracle/PLSQL work, merging very large datasets, and specifying/conducting system and user acceptance testing.

Develop, design, test, and maintain C# applications on a collaborative Scrum team. Work on new system development and enhancements, participate in implementations, and produce/update documentation. Full-stack skills and teamwork required; JavaScript experience preferred.

Design, architect, and build payment and transaction processing applications using C#/.NET. Lead cross-functional meetings, produce high-quality optimized code, implement web services, and collaborate with teams to deliver scalable, maintainable solutions.

As a Senior Software Engineer, lead the development of real-time machine control systems for 3D metal printing platforms, influencing system performance and reliability. Mentor engineers, define software standards, and drive initiatives for system robustness and scalability.