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.

Embedded Software, Software Engineering, Embedded Software, Software Engineering, Electricity, CUDA (Compute Unified Device Architecture), Acceptance Testing, Cryptography, Field Trials, System Test, * 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.

Why Castelion, Why Now

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we’re building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you’ll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.