Senior Hardware Engineer Air-Gapped Crypto Wallet

About Cold Crypt Cold Crypt is building a next-generation, defense-grade, air-gapped hardware wallet designed to redefine crypto security.

Our mission is to combine:

Military-level protection Premium, consumer-grade experience True non-custodial ownership The device will integrate advanced features such as: AI-powered voice interaction Multi-factor authentication (biometrics + PIN + voice) Real-time anomaly detection All while ensuring that private keys never leave a secure, offline environment . About the Role We are seeking a Senior Hardware Engineer to lead the architecture and development of our flagship device. This is a foundational role , working directly with leadership and collaborating closely with software and security teams to bring a highly secure, air-gapped wallet from concept to production. Key Responsibilities Design and develop the complete hardware architecture for a secure, air-gapped crypto wallet Select and integrate: Secure element chips Microcontrollers Biometric sensors Voice input hardware Tamper-resistant components Ensure true air-gapped operation , including offline transaction signing (QR-based or equivalent) Implement advanced physical security protections , including: Side-channel attack mitigation Tamper detection and response Secure key storage architecture Collaborate with software engineers on: AI voice control integration Anomaly detection systems

Lead:

Component sourcing Schematic design PCB layout Prototyping and testing Support transition from prototype → production , including manufacturing considerations Work toward applicable security certifications (e.g., Common Criteria EAL5+/EAL6+) Required Qualifications Strong experience in embedded systems and secure hardware design Hands-on experience with secure element chips (e.g., ATECC608, OPTIGA Trust, STMicroelectronics secure elements) Proven experience with or deep understanding of: Crypto hardware wallets OR Air-gapped systems / high-security devices Proficiency with: PCB design tools (Altium, KiCad, or similar) Microcontrollers (e.g., STM32 or equivalent) Hardware-based cryptography Solid understanding of: Side-channel attacks Tamper resistance techniques Secure boot and firmware integrity Ability to work remotely initially and collaborate in person in Tampa as needed Preferred / Nice-to-Have Direct experience building or contributing to a crypto hardware wallet Experience with air-gapped transaction systems (QR-based signing, offline flows) Knowledge of biometric systems (fingerprint, facial recognition, voice anti-spoofing) Experience with low-power design and battery management Familiarity with secure manufacturing and supply chain considerations What We Offer Competitive salary + equity Token allocation ($COLD) Opportunity to build a category-defining security product Early-stage, high-impact role with direct influence on architecture and design Remote-first flexibility with future Tampa-based collaboration How to Apply If you're excited about building one of the most secure hardware wallets on the market, please send: Your resume Relevant project links (GitHub, hardware portfolio, case studies) A short note on why you're a strong fit

Pay:

$87,722.90 - $105,644.78 per year

Benefits:

Relocation assistance

Work Location:

Hybrid remote in Tampa, FL