Senior Lightning & Bitcoin Payments Engineer (Fully Remote)

Bitrefill; United States; Remote; USD 150,000 - 210,000; Full time

Job summary

Bitrefill, a payments infrastructure company, is seeking an engineer to own and improve our Lightning Network and Bitcoin payment systems. You will ship integrations, optimize how payments flow, and push improvements across the stack in a fully remote team across 30+ countries.

You will work hands-on with Lightning implementations, monitors, security practices, and collaborate with finance to align accounting with on-chain activity.

Qualifications

• Several years building software professionally.
• AI is part of how you build (Claude Code, Codex, Cursor, or similar). This is non-negotiable for us.
• Deep understanding of the Lightning Network protocol and Bitcoin fundamentals.
• Hands-on experience with at least one Lightning implementation (LND, CLN, Eclair, or LDK).
• Strong with our backend stack, Node.js and TypeScript, and comfortable working in Python.
• Crypto-native. You use it, you follow where it headed, and nobody needs to explain Bitcoin to you.
• You've contributed to open-source Lightning or Bitcoin projects.
• Experience with payment channel management and liquidity optimization You run your own node.
• Hands-on with newer Lightning and Layer 2 tech.
• Experience building payments at scale.

Responsibilities

• Own and improve our Lightning Network and Bitcoin payment infrastructure, from everyday upgrades and fixes to larger improvements across the stack.
• Work hands-on with Lightning implementations (LND, CLN, or similar), payment channels, and liquidity management.
• Analyze how our Lightning payments flow, including forensic work after incidents, and build monitoring and policies on top.
• Strengthen the security of our crypto systems: key management, HSMs, and how we safeguard funds.
• Help us get crypto transaction accounting right, working with the finance team so our books reflect how Bitcoin actually moves.
• Evaluate and integrate new Bitcoin and Lightning tech as the space evolves.
• Get new payment protocols into production, from payjoin to nostr-based flows.
• Build the Lightning side of our agentic commerce work.
• Ship with product and design, and contribute to our internal libraries and open-source tooling.

Skills

Software development

Self-driven

Open-source contributions

Experience with payments or crypto

Lightning knowledge

Tools

Node.js

TypeScript

Python

MongoDB

MySQL

Typesense

Job description

Bitrefill, a payments infrastructure company, is seeking an engineer to own and improve our Lightning Network and Bitcoin payment systems. You will ship integrations, optimize how payments flow, and push improvements across the stack in a fully remote team across 30+ countries.

You will work hands-on with Lightning implementations, monitors, security practices, and collaborate with finance to align accounting with on-chain activity.