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Senior Backend Engineer - Payments at Maxana. 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. Company Location: Colombia.