Senior Embedded / Firmware Engineer (Digital Identity SDK)

We are looking for a Senior Embedded / Firmware Engineer to design and build a platform-independent SDK for reading and verifying digital identity credentials across multiple hardware platforms.

The SDK will support technologies such as NFC, BLE, cryptographic authentication, secure communications, certificate validation, and digital credential verification while maintaining portability across embedded systems and Linux-based environments.

This is a product-focused engineering role where API design, portability, documentation, testing, and long-term maintainability are as important as implementation.

You will be responsible for architecting and developing a reusable embedded SDK that can:

• Read and verify digital identity credentials
• Establish secure encrypted sessions
• Support NFC and BLE communication
• Perform cryptographic verification and certificate validation
• Operate across multiple embedded and Linux platforms
• Provide clean APIs and hardware abstraction layers (HALs)
• Support third-party integrations

• Design public SDK APIs and interfaces
• Define abstraction layers for cryptography, secure key storage / HSMs, NFC communication, BLE communication, OS and timing services
• Implement secure communication and credential verification workflows
• Build modular, maintainable, and well-tested code

• Support embedded RTOS environments and Linux platforms
• Develop portable code across multiple architectures and toolchains
• Maintain cross-platform build systems and CI/CD pipelines
• Ensure API and ABI stability across releases

• Create API documentation and integration guides
• Develop test harnesses and validation tools
• Support external developers integrating the SDK

• 2+ years of professional Embedded C development
• Experience building reusable SDKs or libraries consumed by external teams
• Strong understanding of: Embedded systems; RTOS environments; Memory-constrained development; Cross-compilation and toolchains
• Experience with: NFC protocols; BLE communication; Cryptography (ECDSA, ECDH, AES-GCM, HKDF, HMAC); CMake-based build systems
• Strong testing and debugging skills

• Digital identity or credential verification systems
• CBOR / COSE
• Secure elements and hardware security modules
• NFC reader technologies
• Python integration experience
• Certificate validation and PKI concepts
• Embedded Linux development

We're looking for someone who can take ownership of a complex SDK product, make sound architectural decisions, and deliver high-quality, maintainable software that can be used across multiple hardware platforms and by external engineering teams.

Experience building commercial SDKs, libraries, middleware, or protocol stacks is highly valued.