Senior Backend Engineer

Contract role for 6 months at $25 per hour, fully remote within LATAM.

About the role

As the primary backend engineer, you will own the services powering secure, high-converting one-click checkout experiences. You’ll build and operate a scalable NestJS backend that manages accounts, money movement, KYC, and integrations with banking, brokerage, and financial data partners. This is a high-ownership role where you'll make architectural decisions, deliver features end-to-end, and ensure the reliability and performance of production systems.

Responsibilities

• Design, develop, and maintain RESTful APIs using NestJS and TypeScript, consumed by the company’s Android application (Kotlin).
• Own integrations with key fintech partners:
  • Synctera (Banking-as-a-Service)
  • Plaid (Account Linking)
  • Atomic (Brokerage)
  • Zero Hash (Cryptocurrency)
  • Experian (Credit Data)
• Build and maintain critical financial workflows:
  • ACH transfers
  • Card transactions
  • Rewards
  • Payroll processing

Requirements

• 5+ years of backend engineering experience building and operating production systems.
• Strong proficiency in at least one modern backend language (such as Node.js/TypeScript, Go, Java, or Python).
• Experience with NextJS is a plus.
• Production experience with MongoDB (or another document database), Redis, and asynchronous job queues.
• Experience designing and maintaining versioned APIs for mobile applications.
• Hands-on experience with modern infrastructure and deployment technologies, including Docker, Kubernetes, and GitHub Actions (or equivalent CI/CD platforms).
• Proven ability to own systems end-to-end—from architecture and implementation to deployment, monitoring, and incident response.