Bitrefill

Software Engineer

• 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

Lightning Developer

SDET

• Author and maintain E2E automated tests with Playwright and Maestro
• Build out regression, smoke, and sanity suites for critical flows: checkout, payments, gift card redemption, account management
• Integrate automated test execution into CI/CD
• Collaborate with developers to understand new features
• Contribute to test planning, risk assessments

Lightning Developer

SDET / QA Automation Engineer – Fintech, Web3