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

This role is ideal for a seasoned backend engineer with at least 4 years of experience and a track record of technical leadership. You should be highly proficient in either Python or Kotlin and comfortable managing high-traffic distributed systems. Since this team handles "checkout-critical" merchant data, a background in fintech, risk analysis, or high-availability platform engineering is a major plus. The compensation is highly competitive for the Polish market, with a base salary up to 401k PLN plus equity and creative tax benefits. As a remote-first company, you’ll enjoy significant flexibility, supported by "Away Days" for wellness and generous "Flexible Spending Wallets" to cover tech, food, and lifestyle expenses. **You might be a good fit if you:** * Have mastered AWS, MySQL, and Kubernetes to build scalable, reliable backend services. * Enjoy mentoring junior engineers and leading project design from ideation to delivery. * Are comfortable navigating large codebases and maintaining strict latency SLAs. * Want to work for a "remote-first" organization with a transparent pay structure and 100% subsidized healthcare.