Remote Fullstack Engineer – Payment Gateway Integrations

Rezerv Pte Ltd; United States; Remote; USD 94,000 - 125,000; Full time

Job summary

Rezerv is hiring a Fullstack Engineer to develop and maintain payment integrations for its booking, payments, and studio management platform. The role focuses on integrating third-party payment providers, including HitPay and PayPal, with REST APIs and webhooks.

You will work across frontend and backend using React.js, Next.js, C#, and ASP.NET Core to deliver secure, scalable payment functionality and reliable transaction processing.

Qualifications

• 3+ years of fullstack development experience.
• Strong React.js and Next.js experience.
• Strong C# and ASP.NET Core experience.
• Experience with REST APIs and webhooks.
• Experience with third-party API integrations, esp. payment gateways.
• Excellent debugging and problem-solving skills.

Responsibilities

• Integrate and maintain third-party payment gateways and APIs.
• Develop payment-related features across frontend and backend.
• Implement payment flows, webhooks, status updates, and refunds.
• Troubleshoot payment integration issues and API errors.
• Build secure, scalable payment integrations.
• Collaborate with product and engineering to deliver new features.
• Maintain integrations with HitPay, PayPal, and others.

Skills

React.js

Next.js

C#

ASP.NET Core

REST APIs

Webhooks

Payment gateway integration

Tools

HitPay

PayPal

Job description

Rezerv is hiring a Fullstack Engineer to develop and maintain payment integrations for its booking, payments, and studio management platform. The role focuses on integrating third-party payment providers, including HitPay and PayPal, with REST APIs and webhooks.

You will work across frontend and backend using React.js, Next.js, C#, and ASP.NET Core to deliver secure, scalable payment functionality and reliable transaction processing.