Senior Software Engineer, Backend (Merchant Data Platform EU) at Affirm

This role is ideal for a Senior Backend Engineer with at least 4 years of experience who thrives in high-scale, distributed environments. You should be proficient in either Python or Kotlin and have a background in managing mission-critical infrastructure that handles high request volumes while maintaining strict latency SLAs. This is a fully remote position for candidates based in Spain, offering a highly competitive package including 100% subsidized health insurance and generous flexible spending "wallets" for tech and lifestyle. You’ll be joining the Merchant Data Platform team, which is central to the company's checkout ecosystem, providing significant technical ownership and the chance to mentor junior talent in a global engineering culture. **You might be a good fit if you:** * Have practical experience scaling distributed systems using AWS, MySQL, and Kubernetes. * Are comfortable owning the full product lifecycle, from design and estimation to on-call rotation. * Take pride in writing high-quality, extensible code within large, complex codebases. * Enjoy navigating technical ambiguity and collaborating cross-functionally with product and design teams.