Senior Backend Engineer

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 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 High-Impact Architecture Project Executive Visibility Competitive Contract Compensation Flexible Remote Structure Clear Scope, Clear Timeline Long-Term Engagement Technical Ownership