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# Software Engineer- Cybersecurity and Cryptography

- **Company:** Xona Space Systems
- **Location:** United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Kubernetes Security, Amazon Web Services, C++ (Programming Language), Cloud Computing Security, Cyber Security, Computer Programming, Data Security, Digital Signature, Hardware Security Module, Identity and Access Management, Python (Programming Language), Key Management, MISRA C (C Programming Language), Non-Volatile Memory, Public Key Infrastructure, Zero Trust Network Access, Software Engineering, System Programming, HybridCloud, Static Application Security Testing, Vulnerability Analysis, Dynamic Application Security Testing
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/software-engineer-cybersecurity-and-cryptography-xona-space-systems-8100173

## About the Role

* Cryptographic Implementation: Design and implement production-ready cryptographic modules for key management, identity and access management (IAM), and secure communication protocols (e.g., TLS, AES-GCM, ECC).

 * Defensive Programming: Apply rigorous defensive programming techniques to eliminate common vulnerabilities (buffer overflows, integer underflows, race conditions) and ensure software resilience against adversarial inputs.

 * Persistent Memory Integration: Develop secure data-at-rest solutions for persistent memory (PMEM) architectures, ensuring that sensitive cryptographic material stored in non-volatile RAM is encrypted and protected against cold-boot or physical extraction attacks.

 * Ground Software Development: Lead the development of high-availability ground station software that manages the security lifecycle of the satellite constellation.

 * Root of Trust & HSM Integration: Integrate Hardware Security Modules (HSMs) and Trusted Platform Modules (TPMs) into the ground infrastructure to ensure secure key storage and signing operations.

Technical Qualifications

 * Experience: 5+ years of software engineering experience with a heavy focus on security-sensitive applications.

 * Languages: Mastery of C/C++ with a focus on memory-safe patterns and defensive coding standards (e.g., MISRA C, SEI CERT). Proficiency in Python for security tooling.

 * Systems Programming: Direct experience programming for persistent memory or non-volatile storage, including an understanding of memory-mapped files and data consistency models.

 * Applied Cryptography: Deep understanding of symmetric/asymmetric encryption, digital signatures, hashing, and Public Key Infrastructure (PKI).

 * Security Infrastructure: Hands-on experience with Cloud Security (AWS), Kubernetes security, and automated CI/CD security scanning (SAST/DAST).

Preferred Qualifications

 * Experience with Satellite Ground Segment software or aerospace communications.

 * Knowledge of Post-Quantum Cryptography (PQC) standards.

 * Familiarity with hardware-level security and side-channel attack mitigation.

 * Experience implementing Zero Trust architecture in hybrid-cloud environments.

## Description

We are seeking a high-caliber Software Engineer specializing in Cybersecurity and Cryptography to lead the development of our production-grade ground segment software. This isn't just a standard security role; you will be a primary architect and implementer of the cryptographic foundations that protect our satellite constellation and the sensitive data moving between Earth and orbit.

You will build the "trust anchor" of our mission, ensuring that command uplinks, telemetry downlinks, and user data remain authenticated and encrypted against sophisticated threats.


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