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Closed on August 9, 2026.
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Principal Software Engineer
Senior
Design Engineering
Digital Signal Processing
Dsp
Electrical Design
Embedded Systems
Engineering
Fpga
Hardware Engineering
Hardware Software Co Design
Rf Design
Software Engineering
Systems
Vhdl
Vivado
Wireless Communication
Xilinx
Zynq Soc
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Job Description
CACI is seeking a Principal Software Engineer in Melbourne, Florida, on a onsite basis, to tackle RF design software challenges across DSP algorithms, embedded Linux on Xilinx platforms, and RF/FPGA system integration. The role centers on developing high-performance signal processing software while collaborating closely with RF, FPGA, hardware, and systems engineers to realize robust, end-to-end solutions.
Responsibilities
- Design, implement, and optimize DSP algorithms for RF tasks such as modulation and demodulation, filtering, FFTs, channelization, and digital down/up conversion.
- Develop and maintain embedded Linux applications using PetaLinux on Xilinx SoC platforms.
- Connect embedded software with FPGA logic via AXI, DMA, interrupts, EMIO, and memory-mapped peripherals.
- Work with RF front-end components including attenuators, PLLs and frequency synthesizers, programmable gain amplifiers, upconverters and downconverters, and high-speed RF ADC/DAC devices.
- Interface and control ADC/DAC JESD information for signal processing.
- Implement and debug SPI, I2C, GPIO, and register-level control interfaces.
- Support JESD204 (A/B/C) link bring-up in collaboration with FPGA and hardware teams.
- Perform system bring-up, debugging, calibration, and performance optimization.
- Collaborate with RF, FPGA, hardware, and systems engineers to align architecture and requirements.
- Validate designs using RF lab equipment such as spectrum analyzers, signal generators, oscilloscopes, and VNAs.
- Document software, algorithms, interfaces, and test procedures.
- Write low-level firmware for board-level controls via FPGA and/or microcontroller in VHDL and/or C/C++.
Requirements
- Ability to obtain a security clearance.
- Bachelor’s degree in an engineering discipline.
- 10+ years of electronics design experience.
- Experience with RF transceivers such as Analog Devices AD936x or AD908x, or similar.
- FPGA design experience using Vivado and/or Vitis.
- Strong understanding of digital electronics and the ability to follow schematic diagrams.
- Familiarity with AXI interconnects, DMA engines, and high-throughput data paths.
- Experience with spidev, IIO frameworks, or custom Linux drivers.
- Knowledge of GNU toolchains, cross-compilation, and Yocto-based workflows.
- Understanding of wireless or SDR systems (LTE, 5G, Wi-Fi, radar, or custom waveforms).
Technologies
- PetaLinux, Xilinx SoC platforms
- AXI, DMA, JESD204 (A/B/C)
- SPI, I2C, GPIO
- VHDL, C, C++
- Vivado, Vitis
- GNU toolchains, cross-compilation, Yocto
- RF transceivers (Analog Devices AD936x, AD908x)
Benefits
- Healthcare
- Wellness
- Financial
- Retirement
- Family support
- Continuing education
- Time off benefits
Optional Experience
- Experience with Cadence tools and schematic design with OrCAD.
- Experience writing Interface Control Documents or high-level design documents.
- Experience writing automated test code and controlling external test equipment.
- Familiarity with PIC microcontrollers.
- Knowledge of STM32 ARM microprocessors and software development.
- Ability to use test equipment such as oscilloscopes and logic analyzers in debugging device control interfaces.
- GUI design experience in C# or C/C++ for PC control and test application development.
What you can expect
- A culture of integrity.
- An environment of trust.
- A focus on continuous growth.
Pay range
USD 99,800 - 219,600 per year
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