Senior Backend Engineer - Payments at Maxana in Costa Rica, Costa Rica

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