Senior Backend Engineer - Payments

Location: Remote (U.S. overlap preferred) Type: Contract (Full-Time Preferred) Domain: Payments / Fintech / eCommerce Infrastructure About the Project We are leading a modernization initiative for a high-growth digital commerce platform focused on payment orchestration, gateway optimization, and API-driven architecture. Experience with orchestration platforms such as Gr4vy, Stripe, etc. is highly desirable, but not required. Deep payments experience is mandatory. About the Role We are seeking a senior backend engineer to support a payment modernization initiative. You will work directly under the CTO to build and integrate payment orchestration systems and direct PSP connections. Responsibilities - Build and maintain API integrations with multiple PSPs - Implement payment routing logic - Develop webhook handlers - Implement tokenization flows - Support subscription billing logic - Ensure resilience, observability, and clean error handling Requirements - 6+ years backend experience - Strong in one or more: - Node.js - Java - Python - Go - Extensive REST API integration experience - Webhook processing experience - Payments domain experience required - Strong understanding of: - Auth/Capture flows - Refund logic - Chargeback lifecycle - Subscription billing Benefits - High-Impact Architecture Project - Executive Visibility - Competitive Contract Compensation - Flexible Remote Structure - Clear Scope, Clear Timeline - Long-Term Engagement - Technical Ownership