Spiral Blockchain Engineer

Role Description

We’re looking to grow the six-person engineering team that exclusively works on developing the Lightning Development Kit (LDK).

LDK is a comprehensive open-source project that lets developers efficiently build Lightning applications. It includes:

• A full implementation of the Lightning Network protocol written in Rust
• APIs
• Language bindings
• Demo apps
• And more

LDK is used by dozens of projects worldwide, including Lightspark, Cash App, Alby, and BitKit.

The LDK engineers who work for Spiral spend significant time:

• Writing code
• Reviewing code
• Answering questions
• Writing documentation
• Accepting sensible patches and pull requests from other contributors

LDK aims to build a sustainable open-source project that is welcoming to newcomers, beneficial to users, and ultimately not reliant on a single funding source. The development roadmap is transparent, and corporate priorities do not come first; users do.

You Will:

• Contribute to LDK by writing and reviewing code, improving testing infrastructure, and assisting projects and companies that use LDK
• Help add and maintain features such as:
• Language bindings, including Java/Kotlin, C#, JavaScript/WASM/browser extensions, and Swift
• Support for splicing and dual-funded channels
• Support for Taproot, including musig, PTLCs, multi-sig scripts, and custom scripts
• Improve the performance, scalability, and robustness of LDK
• BOLT 12, VSS, and anchor outputs
• A server version of LDK
• Improve bitcoin through passion projects of your choosing

Qualifications

• 8+ years of professional experience
• Hands-on experience with bitcoin and the Lightning Network
• Experience programming with Rust, C, or C++
• Ability to thrive in ambiguity and build creative solutions to complex problems
• Appreciation for bitcoin

How to Apply

Include 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 this position.

Benefits

• Remote work
• Medical insurance
• Flexible time off
• Retirement savings plans
• Modern family planning

Company Description

Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people:

• Square makes commerce and financial services accessible to sellers.
• Cash App is the easy way to spend, send, and store money.
• Afterpay is transforming the way customers manage their spending over time.
• TIDAL is a music platform that empowers artists to thrive as entrepreneurs.
• Bitkey is a simple self-custody wallet built for bitcoin.
• Proto is a suite of bitcoin mining products and services.

Together, we’re helping build a financial system that is open to everyone.