Top C# Jobs

Develop and maintain scalable enterprise systems, including loan origination, servicing, and customer-facing applications. Design APIs, middleware, integrations, and secure backend services; participate in code reviews, architecture discussions, automation, CI, legacy modernization, troubleshooting, and performance tuning. Collaborate across teams in an Agile and DevOps environment while mentoring peers and promoting modern development practices.

Design, implement, test, and modernize backend services and integrations (TypeScript/Node.js and C++). Lead large projects, write technical specifications and API contracts, enforce coding standards, coach engineers, and drive legacy-to-modern migrations within online banking and core systems.

Build and maintain cross-platform endpoint agent capabilities for Windows, macOS, and Linux using Rust and native operating system APIs. Develop secure, concurrent, networked systems integrating with backend services, and own features from design through production support. Investigate complex endpoint issues, improve performance, reliability, security, and upgrades, and contribute through design reviews, code reviews, automated testing, and technical guidance.

Design and build data-driven advertising software features, scale distributed applications and infrastructure, optimize algorithms and architectures, reduce cloud costs, and improve observability. Participate in on-call rotations and incident escalation, create technical documentation and playbooks, and collaborate with distributed teams across time zones. The role requires strong software architecture, performance optimization, data modeling, Linux, and compiled-language expertise.

Design, develop, and optimize high-performance C++ systems software for Linux-based manufacturing intelligence platforms. Build multithreaded and asynchronous architectures, profile performance, debug software-hardware issues, maintain Python tooling, and collaborate with firmware, hardware, and application teams throughout the product lifecycle.

Lead a team of software developers while remaining hands-on with C#/.NET development, architecture, coding, code reviews, and complex problem resolution. Guide technical decisions, mentor engineers, improve engineering standards and CI/CD practices, and deliver scalable, secure, reliable SaaS features. Collaborate with distributed Product and Engineering teams, contribute to system design, and help build a growing U.S. engineering organization.

Design and implement high-performance datapath features for load balancing, firewall rules, and Layer 7 protocols. Build scalable networking and security systems using C or C++, data structures, algorithms, and Unix/Linux optimization. Own architectural projects from conception through large-scale deployment while applying advanced knowledge of DNS, HTTP, TCP/IP, and SSL/TLS. Use AI tools to improve engineering workflows and problem-solving.

Design and implement high-performance datapath features for load balancing, firewall rules, and Layer 7 protocols. Build scalable networking and security applications using C or C++, advanced data structures and algorithms, and Unix or Linux systems. Own complex architectural projects from concept through deployment while applying expertise in DNS, HTTP, TCP/IP, and SSL/TLS to enhance global network infrastructure.

The role requires analyzing requirements, coding in C++, collaborating with technical leads, and participating in design reviews, while being under supervision.

Develop complex, scalable public safety software using C#, Angular, databases, APIs, cloud infrastructure, and AI integrations. Lead design and code reviews, guide developers, contribute to architecture, improve frameworks, address technical debt, create automated testing strategies, optimize database and application performance, and diagnose escalated production issues. Serve as a technical subject matter expert while coordinating with internal teams, customers, and external entities.

Develop and test C++ software for FactoryTalk Optix HMI and control-system applications across Windows and Linux. Responsibilities include subsystem design, requirements documentation, implementation, unit and automated testing, debugging, code and design reviews, anomaly analysis, and product quality validation. The role collaborates with global Agile teams, improves development and test automation practices, researches technologies, communicates design concepts, and mentors other engineers.

Develop and maintain FactoryTalk Optix HMI software for industrial control environments. Responsibilities include implementing features, documenting designs and code, developing and executing unit and automated tests, troubleshooting software issues, reviewing technical materials, and improving development and test automation practices. The role involves collaboration with global teams and deployment across Windows and Linux systems.

Design, develop, test, and maintain C#/.NET software products and platforms. Create database stored procedures, SQL scripts, and ETL jobs; optimize relational database performance; and contribute to Agile/Scrum processes. Collaborate across teams, mentor developers, facilitate technical discussions, evaluate emerging technologies, and deliver reliable products that meet specifications and performance SLAs.

Develop and integrate C/C++ ground support equipment software, simulators, test tools, and core applications in a Linux-based classified environment. Responsibilities include requirements and design documentation, testing, peer reviews, configuration management, hardware/software interface support, system integration, deployment, and troubleshooting. Higher-level duties may include technical leadership, mentoring, schedule support, and customer or program discussions. The role is fully onsite in Chandler, Arizona, requires an active Secret clearance, and follows a 9/80 schedule.

Develop and maintain highly visible Apartments.com web applications using C# and .NET. Design maintainable software, write unit-testable code, create database procedures and SQL/ETL jobs, and improve application performance. Participate in Agile/Scrum development, testing, architecture improvements, mentoring, consensus building, and evaluation of emerging technologies. The role is primarily onsite in Irvine, California, four days per week.

Develop and support full-stack web applications for Source-to-Pay business processes. Responsibilities include designing .NET solutions, developing front-end and back-end functionality, integrating RESTful services and databases, troubleshooting production issues, testing, documenting, supporting users, participating in architecture and code reviews, and mentoring junior developers. The role requires collaboration with business stakeholders and ownership of development projects.

Develop scalable full-stack applications, secure APIs, microservices, event-driven integrations, and production AI solutions. Build agentic workflows, semantic search, and conversational tools using modern AI frameworks. Deploy cloud workloads with CI/CD, containers, Kubernetes, and infrastructure as code while implementing security, compliance, governance, monitoring, and observability. Collaborate with product, architecture, data, security, and business teams to translate requirements into enterprise-grade financial technology solutions.

Develop and integrate software for SIGINT processing systems supporting an Intelligence Community customer. Responsibilities include analyzing requirements, designing and coding software, debugging defects, integrating systems, writing basic database queries, automating Linux tasks with Bash, and improving documentation and development standards. The role is onsite at Fort Meade and requires an active TS/SCI clearance with Full Scope Polygraph.

Develop and maintain C#/.NET applications, SQL databases, and manufacturing execution systems supporting automotive production. Monitor and maintain servers, virtual machines, workstations, and production equipment; troubleshoot incidents, debug code, and support system reliability, backups, clustering, and disaster recovery. Collaborate with production, infrastructure, security, and database teams, provide technical support and training, document incidents, and help maintain high availability of manufacturing IT systems.

Develop and maintain SpaceX’s core test infrastructure framework and applications for production testing, integration testing, simulations, and flight systems. Improve software reliability, performance, safety, and user experience while collaborating with flight software engineers. Responsibilities include software design, development, testing, deployment, monitoring, performance optimization, and solving complex engineering problems. The role is onsite and may require extended hours or weekends based on launch schedules.

Designs and builds scalable, resilient distributed systems and applications using .NET, C#, microservices, REST APIs, cloud platforms, containers, and DevOps practices. Responsibilities include architecture, coding, code reviews, reusable components, monitoring, continuous delivery, infrastructure as code, cross-functional collaboration, mentoring engineers, and improving engineering processes.

Lead maintenance and expansion of a flagship Windows client-server accounting product. Design, implement, test, and document features; maintain large legacy C++ codebase while developing in C#/.NET. Collaborate with cross-functional teams, gather user requirements, optimize databases, ensure code quality, and apply finance domain knowledge to deliver reliable accounting software.

Develop high-performance C++ services and libraries on Linux for real-time systems integrating AI, hardware interfaces, and sensor data. Optimize CPU, memory, I/O, concurrency, and build performance; debug multithreaded issues; write tests; apply sanitizers and static analysis; and contribute to CI pipelines and developer tooling.

Develop software using C# and Oracle or SQL databases, including PL/SQL or T-SQL. Preferred experience includes web services, WCF, Web API, and Silverlight. The interview process includes an initial phone interview followed by an in-person interview in Miamisburg, Ohio, or Jacksonville, Florida, depending on the candidate’s location.

Designs, develops, tests, operates, and maintains full-stack .NET software applications, APIs, and enterprise services. Responsibilities include writing production-ready code, creating scalable and reliable architectures, conducting code reviews, troubleshooting failures, improving operations, supporting production applications, and applying security, compliance, DevOps, and software reliability practices. The role requires collaboration with product, engineering, vendors, and business stakeholders.