Lightning Developer at Bitrefill · Stockholm

You know Bitrefill, you've probably routed a payment through us. You get why Lightning matters and you want to build the infrastructure that makes it work for a million+ customers across 180 countries. If that's you, hit the apply button and let's talk.

If you need more info to decide, keep reading. We kept the corporate fluff out, so it won't take long.

About the role

Bitcoin and Lightning are where Bitrefill comes from, and they're still core to what we do. There's more happening in this space than the team can keep up with, so we're bringing in more hands to keep things running and push them forward: shipping the integrations we keep talking about, digging into how our payments actually flow, and turning "we should really do this" into things that are live.

Our Tech Stack

• Node.js / TypeScript
• Python
• MongoDB, MySQL, Typesense
• Amazon AWS, Kubernetes

What you'll do

• Own and improve our Lightning Network and Bitcoin payment infrastructure, from everyday upgrades and fixes to 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

What we're looking for

• Several years building software professionally, with a track record of shipping real things
• 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's headed, and nobody needs to explain Bitcoin to you
• Self-driven. You spot the opportunity and push it forward instead of waiting for a roadmap

Bonus points

• 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

Why Bitrefill

We've been quietly right about something since 2014: internet money should just work. Fully remote since day one. Team across 30+ countries. Get paid in crypto if you want. No bullshit meetings. Twice a year we meet up to build together in person. The rest of the time: work hard, get shit done.