Senior Software Engineer, Payments

Description: Alt is focused on the $5B trading-card market, enabling collectors to buy, sell, vault, and finance cards. The Senior Software Engineer will manage money movement, payment integrations, and ensure high reliability in transactions. Requirements: 5+ years of backend systems experience, particularly with Python, Postgres, and AWS. Proven experience with real money movement systems (ACH, RTP, wires). Familiarity with payment provider integrations and handling large transactions. Strong SQL skills and understanding of marketplace dynamics. Experience with fraud, dispute, or chargeback processes is a plus. Benefits: 85% coverage of medical, dental, and vision insurance; up to 50% for dependents. Generous PTO and parental leave at full salary. Monthly wellness and home office stipends. Remote-first work environment with WeWork access. 401(k) and equity options for full-time employees.