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
• 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