Senior Embedded Software Engineer
Castelion Corporation · Allen, Texas, United States · On-site
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About Castelion
Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid flight testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.
Senior Embedded Software Engineer
Castelion is seeking a Senior Embedded Software Engineer to architect, implement, and harden software running on resource constrained, mission critical systems. You'll write low-level C and Rust, accelerate workloads with CUDA, and own secure processing paths (crypto, secure boot, key management) from concept through field test. You'll collaborate closely with electrical, systems, and test teams to bring new hardware online fast and keep it reliable.
Responsibilities
Embedded & Firmware Development
Design and implement embedded applications, device drivers, and board support packages in C and Rust.
Optimize and parallelize compute-intensive algorithms using CUDA on embedded GPUs.
Bring up new boards: bootloaders, secure boot chains, peripheral initialization, and diagnostics.
Implement and validate cryptographic protection using TPMs
Systems Integration & Testing
Integrate sensors, comms links, and high-rate data paths, profile and tune for latency and throughput.
Develop automated HW-in-the-loop tests; script board flashing, provisioning, and regression suites.
Use JTAG, logic analyzers, oscilloscopes, and trace tools to debug hard problems.
Monitoring & Telemetry
Instrument systems for performance and reliability; feed data to Grafana/Foxglove for analysis.
Collaboration & Troubleshooting
Partner with cross functional teams to isolate issues quickly in lab and field environments.
Document designs, decisions, and interfaces clearly for internal and external stakeholders.
Basic Requirements
Bachelors in Computer Science, Electrical/Computer Engineering, or related field.
5+ years professional embedded software experience (bare metal and/or RTOS).
Strong proficiency in C and production Rust (unsafe code discipline, ownership semantics).
Hands-on CUDA development on embedded or edge-class GPUs (Jetson, similar).
Experience with ARM-based SoCs, memory-mapped I/O, DMA, interrupts, IPC.
Proven work on secure boot, cryptography libraries, key management, or similar security-critical code.
Comfortable with Linux internals, cross-compilers, build systems, and hardware debugging tools.
Solid Git/GitHub workflows and familiarity with modern CI/CD.
Preferred Skills and Experience
Experience with Zephyr, FreeRTOS, or seL4;
Knowledge of DSP, real-time networking, or RF signal chains.
Azure or other cloud services for telemetry ingestion.
US Citizenship and ability to potentially obtain/maintain security clearance.
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