Senior Software Engineer, Backend (Merchant & Partner Lifecycle)

<div class="content-intro"><p>At Affirm, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most.</p></div><p>The Merchant &amp; Partner Lifecycle (M&amp;PL) team is at the forefront of Affirm’s architectural transformation. We are addressing critical architectural risks by consolidating merchant lifecycle orchestration into a newly cohesive domain.&nbsp;</p> <p>You will act as a technical leader responsible for building out the brand new lifecycle-orchestrator service that’s at the heart of multiple connected systems. Your work will deliver immediate availability improvements through system simplification and isolation, and modernize older parts of the codebase.</p> <p><strong>What You'll Do</strong></p> <ul> <li>Design &amp; expand the backbone of our platform to scale to hundreds of thousands of merchants from all around the world</li> <li>Design and align the scope of work with other teams to deliver cross-team projects</li> <li>Mentor other engineers to ensure their development &amp; growth</li> <li>Partner with Engineering Manager and Team Lead to drive and execute the long-term vision of the team</li> <li>Execute technical strategy for broad or complex requirements with insightful and forward-looking approaches that go beyond the direct team and solve large open-ended problems</li> <li>Utilize agentic development tools like Claude Code to automate parts of the