Blockstream

Hardware Wallet Firmware Developer

North America

Not SpecifiedCompensation
Junior (1 to 2 years)Experience Level
Full TimeJob Type
UnknownVisa
Financial Technology, Cryptocurrency, Blockchain HardwareIndustries

Embedded C Developer - Bitcoin Hardware Wallet

Company Information

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. Focusing on building fundamental Bitcoin infrastructure, Blockstream quickly grew into one of the leading technology power houses of the industry.

At Blockstream, we’re building solutions on Bitcoin that will disrupt the existing financial system. We imagine a world where individuals and businesses can easily access a global, permissionless system to secure their money, use it every day, and invest it or put it to work. In pursuit of our expansive vision, we’ve built a full stack of innovative products on top of the Bitcoin protocol, from layer-2 projects like Liquid and Core Lightning, to end-user software and hardware wallets like Green and Jade. Our brand stands for innovation in the Bitcoin community, and we’re growing our team to accelerate the future.

Position Overview

We are seeking an experienced Embedded C Developer to help build and maintain the firmware for a Bitcoin hardware wallet. You’ll work on a security-critical embedded platform, integrating cryptographic functionality with low-level drivers and secure communication interfaces.

Responsibilities

  • Develop, test, and maintain firmware for a Bitcoin hardware wallet using C on embedded systems.
  • Work with low-level hardware interfaces: I2C, SPI, UART/Serial, DMA, and BLE, USB Host/Guest.
  • Implement and optimize secure communication protocols and key management.
  • As applicable, develop for and collaborate with the testing team to ensure the device works reliably over BLE and USB serial on Windows, macOS, Linux, Android, and iOS.
  • Participate in design and security reviews of firmware components.
  • Keep dependencies and submodules up to date and compatible.
  • Work closely with Bitcoin protocol engineers to ensure accurate, secure implementation of core functionality.

Required Qualifications

  • 5+ years of C development experience, including direct interaction with memory and registers.
  • 5+ years of experience on embedded systems (bare metal or RTOS).
  • Strong understanding of embedded communication protocols (I2C, SPI, Serial).
  • Experience writing or debugging BLE integrations.
  • Experience developing and testing over serial and BLE interfaces across desktop and mobile platforms.
  • Experience with low level/embedded GUI development.
  • Experience with multithreading/thread safety/locking.

Preferred Qualifications

  • Experience with esp-idf on the ESP32 series platform.
  • Experience in Bitcoin protocol development or applications.
  • Familiarity with Liquid/Elements sidechains.
  • Security background: familiarity with cryptography (DH, symmetric/asymmetric encryption, digital signatures, etc), HSMs, secure key storage, and threat models.
  • Experience working with DMA-driven data pipelines.
  • Contributions to Bitcoin Core, Elements, or similar open-source projects.

Employment Type:

Location Type:

Salary:

Skills

Embedded C
Low-level hardware interfaces
I2C
SPI
UART/Serial
DMA
BLE
USB
Cryptography
Secure communication protocols
Key management
Cross-platform testing (Windows, macOS, Linux, Android, iOS)

Blockstream

Blockchain solutions for Bitcoin and digital assets

About Blockstream

Blockstream enhances the infrastructure of the cryptocurrency market, focusing on Bitcoin and digital assets. Their main products include the Liquid Network, which allows for faster and more private transactions; Blockstream Mining, offering mining services and investment opportunities; Core Lightning, which enables quicker and cheaper Bitcoin transactions; and secure wallets like Blockstream Green and Jade for storing Bitcoin and Liquid assets. They also provide global access to Bitcoin data through Blockstream Satellite, which broadcasts the Bitcoin blockchain via satellite. Blockstream serves a wide range of clients, from individual users to institutional investors, and generates revenue through transaction fees, mining services, hardware sales, and partnerships. Their goal is to improve the security, scalability, and functionality of Bitcoin and other digital assets, making them a versatile player in the digital asset ecosystem.

Montreal, CanadaHeadquarters
2014Year Founded
$604.1MTotal Funding
CONVERTIBLECompany Stage
Crypto & Web3, Financial ServicesIndustries
51-200Employees

Benefits

Health Insurance
Dental Insurance
Vision Insurance
Flexible Work Hours
Remote Work Options
Stock Options
401(k) Retirement Plan
Performance Bonus

Risks

Competition from Ledger and Trezor challenges Blockstream's Jade wallet market share.
New CIO Sean Bill may shift asset management strategies, affecting partnerships.
Convertible note financing increases financial risk if market conditions change.

Differentiation

Blockstream Satellite provides Bitcoin access without internet, enhancing global accessibility.
Liquid Network offers faster, confidential transactions, appealing to traders and exchanges.
Core Lightning facilitates cheaper Bitcoin transactions, improving scalability and efficiency.

Upsides

Rising demand for non-custodial wallets boosts Blockstream Green Wallet adoption.
Growing interest in satellite-based solutions aligns with Blockstream Satellite's capabilities.
Bitcoin's hash rate increase benefits Blockstream's mining operations and investment products.

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