Senior Software Engineer - Architecture & Systems Design Herndon, VA, US

CACI International Inc.; Herndon (VA); On-site; USD 94,000 - 198,000; Full time

Job summary

CAC I International Inc. is seeking a Senior Software Engineer to design distributed software architectures for embedded RF systems.

Responsibilities include creating high‑performance C++ frameworks for inter‑processor communication and defining software interfaces across x86, ARM, and FPGA domains. You will document architecture decisions with UML diagrams and sequence charts and collaborate with FPGA and signal processing teams to optimize data pipelines.

Qualifications

• 5–7+ years in embedded systems or high‑performance computing on Linux
• BS or MS in Computer Science, Software Engineering, Electrical or Computer Engineering, or related field
• Strong proficiency in C++ for embedded real‑time systems, including concurrency and memory management
• Experience designing software architectures and documenting diagrams/architecture specifications
• Experience with multi‑threaded development and debugging race conditions in inter‑processor and microservice architectures
• Familiarity with modern build systems and DevOps tools (Conan, Docker, GitLab or similar)
• Experience with performance analysis and debugging tools (VTune, perf, gdb, valgrind)

Responsibilities

• Design distributed software architectures across x86, ARM, and FPGA domains with real‑time RF processing
• Develop high‑performance C++ frameworks for inter‑processor communication
• Create technical docs: sequence charts, UML diagrams, architecture specs for distributed teams
• Design microservice architectures for x86 and ARM while balancing modularity and resource use
• Profile and optimize for memory‑bound and compute‑bound workloads using VTune and related tools
• Collaborate with signal processing engineers to shape data pipelines for RF samples
• Develop C++/Python test harnesses and unit tests to validate behavior and edge cases
• Integrate CI/CD, containerization, and build automation into workflows
• Coordinate with FPGA engineers to align hardware/software interfaces

Skills

C++ development

embedded real‑time systems

multi-threading

DevOps tools (Conan, Docker, GitLab)

performance analysis (VTune)

Education

BS or MS in CS/Software Engineering/EE/CE

Tools

Conan

Docker

GitLab

VTune

Job description

## Senior Software Engineer - Architecture & Systems DesignHerndon, VA, USApply NowFind out how well you match with this jobJob ID330039Job Title: Senior Software Engineer - Architecture & Systems DesignJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: NoneEmployee Type: RegularPercentage of Travel Required: NoneType of Travel: None\* \* \***The Opportunity:*** Design, architect, and implement complex embedded RF systems as part of a multi-disciplinary team working on specialized tools, sensors, and communications devices for demanding applications* Contribute to software architecture decisions for inter-processor and microservice systems where your technical choices directly impact system performance, real-time behavior, and the ability to process high-rate RF data in resource-constrained environments* Work with engineers across the full embedded system stack—from signal processing algorithms to FPGA fabric, from application layer to hardware interfaces* Own technical design from initial architecture through production deployment, making practical trade-offs between competing constraints like schedule, performance, portability, and maintainability**Responsibilities:*** Design distributed software architectures spanning multiple processing domains (x86, ARM, FPGA fabric), defining communication patterns and data flows for real-time RF signal processing systems* Develop high-performance C++ frameworks for inter-processor communication in systems where latency and throughput are critical constraints* Create technical documentation including message sequence charts, UML class diagrams, and software architecture specifications that enable distributed teams to build complex systems correctly and efficiently* Design microservice architectures for x86 and ARM platforms, balancing modularity, performance, and resource constraints* Profile and optimize software for memory-bound and compute-bound workloads using tools like vTune, identifying bottlenecks and implementing measurable performance improvements* Work with signal processing engineers to design data pipelines that move RF samples from ADCs through filters, demodulators, and decoders* Develop debugging approaches for resource-constrained embedded systems where standard tools provide limited visibility* Build C++/Python test harnesses and unit tests that generate representative workloads, validate system behavior, and verify edge cases* Integrate modern development tools and practices including CI/CD pipelines, containerization, and build automation* Collaborate with FPGA engineers to define hardware/software interfaces that leverage programmable logic capabilities while maintaining software flexibility**Qualifications:** *Required:** 5-7+ years of professional software engineering experience in embedded systems and/or high-performance computing in Linux based environments* BS or MS in Computer Science, Software Engineering, Electrical or Computer Engineering, or related field* Strong proficiency in C++ development for embedded real-time systems, including concurrency, memory management, and optimization techniques* Demonstrated experience designing and implementing software architectures and communicating technical concepts through documentation and diagrams* Experience with multi-threaded application development and debugging concurrency issues, including race conditions in inter-processor and microservice architectures* Working knowledge of software design patterns and development methodologies for complex systems* Experience with modern build systems and DevOps tools (Conan, Docker, GitLab or similar)* Experience with performance analysis and debugging tools (vTune, perf, gdb, valgrind, or similar) to identify and optimize bottlenecks* Ability to make informed trade-offs between portability, performance, and architecture-specific optimizations*Desired:** Experience with communications systems and digital signal processing, including filters, modulation/demodulation schemes, channel equalization, and forward error correction (FEC)* Experience with wireless communications protocols (3GPP, IEEE 802.11, IEEE 802.15)* Understanding of the signal processing pipeline from RF data collection through digital processing-**What You Can Expect:****A culture of integrity.**At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.**An environment of trust.**CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.**A focus on continuous growth.**Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.**Pay Range**:There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.The proposed salary range for this position is:$94,400 - $198,200*CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.*