Top Senior C# Jobs in Phoenix, AZ

Design, develop, test, deploy, and support features for a distributed, event-driven avionics SaaS platform using C#, Azure, microservices, containers, and DevOps practices. Responsibilities include implementing automated unit, functional, contract, and canary tests; diagnosing production issues; and participating in occasional off-shift support. The role requires collaboration within an agile software engineering team and is based in Phoenix, Arizona, on a hybrid schedule.

Develop cross-platform C++ and Qt software for network device discovery, monitoring, and data collection across Windows and Linux. Build high-performance, concurrent, asynchronous systems that communicate with thousands of devices using SNMP, SSH, ICMP, WMI, and related protocols. Own testing, troubleshoot issues across application, operating-system, and network layers, optimize reliability and performance, and collaborate with backend, UI, QA, and product teams.

Develop scalable C++ software that defines and enforces endpoint behavior across millions of managed Windows endpoints. Responsibilities include implementing features, improving platform performance, shipping production code, designing new systems, writing architecture documents, defining subsystem contracts, and collaborating with server, UI, product, and design teams. The role requires deep Windows systems and kernel-driver expertise, with preferred experience in WHQL, minifilter or WFP drivers, macOS Endpoint Security, and Linux kernel development.

Design, develop, integrate, and validate mission-critical embedded avionics software using C/C++ and Python in deterministic RTOS environments. Integrate aircraft subsystems, implement avionics communication protocols, and ensure compliance with DO-178B/C, ARP4754, and safety requirements. Manage requirements traceability, testing, documentation, and continuous integration using Jira, Bitbucket, Confluence, Bamboo, and IBM Rational DOORS. Provide technical mentorship and collaborate across engineering teams to develop next-generation cockpit platforms.

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.

Design and develop scalable C++ software for endpoint state and control across Windows, macOS, and potentially Linux. Build reliable, multi-process systems that enforce endpoint behavior, manage local state, support IPC, and operate across millions of devices. Responsibilities include implementing features, improving platform performance, writing design documents, defining architecture and IPC contracts, and making technical decisions in an evolving, sparsely documented environment.

Designs and validates electromagnetic interference and compatibility compliance from component through system level. Responsibilities include modeling interference coupling and shielding, conducting and troubleshooting EMI/EMC and RF tests, developing test apparatus and procedures, analyzing test data, preparing qualification reports, and supporting technical, cost, and schedule performance. The role requires occasional travel, off-shift work, and collaboration across engineering teams. Candidates must be U.S. citizens able to obtain and maintain Top Secret clearance and SCI access.

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.

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.

Leads and develops a software engineering team while contributing hands-on to enterprise application design, coding, testing, code reviews, production support, and technical decisions. Builds scalable solutions using C#, ASP.NET, SQL Server, and modern web technologies; partners with product and business stakeholders; supports Agile delivery, CI/CD, troubleshooting, root cause analysis, and engineering best practices. The role also includes mentoring engineers, monitoring delivery and operational metrics, and driving continuous improvement.

Design, develop, and field high-performance Ground Control Station and C2 software using C++/Qt/QML and QGroundControl. Lead architecture and technical direction, mentor engineers, define APIs/ICDs, debug integration/latency issues, support field tests, implement post-mission debrief tools, and ensure interoperability with C2 standards.

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.

Design, build, test, and maintain full-stack web applications using .NET/C# and SQL. Optimize T-SQL, create technical documentation, write user stories, conduct unit testing, estimate work, and collaborate with users and teams for enhancements and issue resolution.

Leads the architecture, design, integration, verification, and technical oversight of spacecraft Command and Data Handling electrical systems. Responsibilities include flight computers, data buses, telemetry, command systems, harnesses, requirements, interface documentation, design reviews, risk mitigation, manufacturing coordination, cost and schedule development, and hardware/software integration. The role provides technical leadership across avionics, software, GNC, and mission operations while mentoring engineers and supporting program execution.

Design and develop low-latency, high-throughput distributed database kernels for massively parallel analytics. Responsibilities include architecture, modern C++ development, MPI/OpenMP query execution, SIMD and hardware optimization, distributed networking, database internals, in-database machine learning, vector indexing, performance tuning, code reviews, mentoring, and resolving scalability issues across large-scale clustered systems.

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.

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.

You will develop and maintain components of the LLVM based toolchain, collaborating with the community while ensuring platform-specific optimizations and tests.

Designs and develops complex applications, authors technical specs, mentors junior developers, implements UI and backend code, unit tests and debugs, ensures quality/security/compliance, and produces technical documentation.

Lead EMI/C engineering activities from component to system level: define and tailor test requirements, model interference and shielding, perform emissions/immunity testing, design test apparatus, analyze results, generate procedures/reports, and support mitigation/troubleshooting. Occasional travel and off-shift work may be required.

As a Sr. Software Engineer at Bloomerang, you will lead technical direction, mentor engineers, and enhance SaaS solutions while utilizing .NET and AI tools. You will ensure scalable, maintainable applications, advocate for Agile workflows, and focus on quality outcomes in software development.

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.