Bitcoin Engineer, Spiral

Full time | Full day

Bitcoin Engineer, Spiral

Posted 14 January by Square

  • San Francisco

Company Description

Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams — People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more — provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.

Job Description


Spiral was founded in 2019 to improve the bitcoin ecosystem by contributing to free and open-source projects. After six months of nothing but tweeting, a PM and engineers were hired and began work on the Lightning Development Kit, a collection of developer-focused tools that simplify and expedite the process of adding Lightning Network functionality to bitcoin applications.


Spiral is hiring three engineers. Are you one of them? Here’s who you are, what you’ll work on, and most of what you need to know:

  1. You love nothing more than dressing for comfort and XKCD memes that haven’t been funny for years. No one you love can describe with any detail what you do for a living.

  2. You’ll contribute to the Lightning Development Kit by reviewing code, improving testing infrastructure, and improving support for language bindings. When you’re not doing all of that, you’ll improve bitcoin through passion projects of your choosing. Almost anything goes.

  3. You’ll help add the following features to the Lightning Development Kit (if this stuff doesn’t make sense to you, neither will this role):

    • Support for new language bindings including JavaScript/WASM/browser extensions, Python, and Go
    • Support for Taproot including musig, PTLCs, and multi-sig scripts
    • Improved sample wallets/nodes that integrate BDK with the LDK sample and provide default batteries for most common scenarios
    • An improved Photon via language bindings support, multi-sig and LN backup support, and an integrated BDK and LDK strategy
    • Support for LSP functionality including automatic channel management and 0conf
    • Improvements for LN payment protocols such as BOLT12 and LNURL



We’ll hire anybody—as long as they’ve got 7+ years of SWE experience and no unbreakable curses controlling their every action. If you’re great, we might overlook these requirements. Additional boxes to be checked include bitcoin and Lightning Network experience (great but not required), appreciation for and commitment to the FOSS bitcoin ethos (required), and familiarity with or a desire to learn Rust (just great).


Bitcoin is global, and so are we. At Spiral, you can work from wherever you want* as long as you let @jack crash on your couch when he’s in town.

*Certain locations may require us to consult with lawyers.


All that sound good? Not too confused? Great. You’ve cleared the first hurdle. Apply here or shoot us an email with a copy of your resume, a link to your GitHub (if you’ve got one), any side projects you’ve got floating around that you think we should see, and some words that explain why you’re a fit for these positions: [email protected]

Additional Information

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class. 

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we’re doing to build a workplace that is fair and square? Check out our I+D page. 

Additionally, we consider qualified applicants with criminal histories for employment on our team, assessing candidates in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.


We want you to be well and thrive. Our global benefits package includes:

  • Healthcare coverage
  • Retirement Plans
  • Employee Stock Purchase Program
  • Wellness perks
  • Paid parental leave
  • Paid time off
  • Learning and Development resources

Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services. Made up of Square, Cash App, Spiral, TIDAL, and TBD54566975, we build tools to help more people access the economy. Square helps sellers run and grow their businesses with its integrated ecosystem of commerce solutions, business software, and banking services. With Cash App, anyone can easily send, spend, or invest their money in stocks or Bitcoin. Spiral (formerly Square Crypto) builds and funds free, open-source Bitcoin projects. Artists use TIDAL to help them succeed as entrepreneurs and connect more deeply with fans. TBD54566975 is building an open developer platform to make it easier to access Bitcoin and other blockchain technologies without having to go through an institution.

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