Blockstream was founded in 2014 by Dr. Adam Back and a group of fellow cryptographers and engineers passionate about Bitcoin and its potential to change the future of finance. We have become a market leader in Bitcoin security and Layer-2 technologies. Our products are designed to make financial systems more efficient, secure, and robust.

Blockstream is seeking a Senior Firmware Engineer to join the team behind Jade, our flagship open-source hardware wallet. Jade is the cornerstone of our self-custody mission, providing a versatile, secure environment for Bitcoiners - from those just starting their journey to power users demanding air-gapped, multisig, and descriptor-based transaction signing.

As a skilled Senior Firmware Engineer joining our high-impact team, you will work closely with our existing lead developers to build and refine the firmware that secures our users' assets.

What You'll Be Doing (Responsibilities)

• Work as a core contributor to the Blockstream Jade firmware, writing robust, secure C/Python code within a small, agile team.

• Extend and optimize our support for advanced signing protocols such as taproot, atomic swaps, and simplicity.

• Design and implement features like air-gapped camera signing, cryptographic primitives, and secure communication protocols.

• Develop optimized solutions to work within a resource constrained execution environment.

• Contribute to a transparent, open source codebase where your work is visible to the entire Bitcoin community.

What We Look For In You (Required Qualifications)

• Proven track record in C/C++ development for microcontrollers with real world esp32/esp32s specific experience.

• Solid understanding of Bitcoin internals, with a specific focus on Taproot, SegWit, and PSBTs.

• Experience with secure boot, memory protection, and defending against software based and side-channel attacks.

• Comfortable working with peripherals (cameras, screens) and low-level protocols (SPI, I2C, UART).

• An active GitHub presence with contributions to open-source projects is highly preferred.

Nice To Haves (Preferred Qualifications)

• Previous experience working in a team and working with remote team members.

• Familiarity with Python for tooling and testing.

• Up-to-date knowledge of Bitcoin latest developments.

• Experience with Liquid/Elements and/or confidential transactions.