Senior Embedded Software EngineerCastelion 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.
ResponsibilitiesEmbedded & 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 Qualifications- 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.
Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.
Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.
Additional Eligibility Requirements This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.
