Backend Developer (PHP/Golang, Payments)

TL;DR

Backend Developer (PHP/Golang, Payments): Maintain and enhance a high-scale card payment processing platform with an accent on integrating payment service providers and optimizing transaction flows. Focus on designing scalable, event-driven architectures and ensuring system reliability under high load.

Location: Remote (USA)

Company

hirify.global is a global commerce company providing robust tools and services to help video game developers fund, distribute, market, and monetize their games.

What you will do

• Develop and maintain backend services for card payment processing using PHP (Symfony) and Golang.
• Integrate and support payment service providers (PSPs) and acquirers (e.g., Adyen, Checkout.com, JP Morgan Chase).
• Design and implement scalable, event-driven architectures for high-load payment systems.
• Write clean, testable code with comprehensive unit and functional test coverage.
• Optimize database queries and data models for OLTP workloads (MySQL, MongoDB).
• Collaborate with the team on system design, code reviews, and technical decisions.

Requirements

• 3+ years of backend development experience with PHP and/or Golang in production environments.
• Hands-on experience with card payment processing and PSP/acquirer integrations.
• Understanding of payment flows: authorization, capture, refunds, chargebacks, and reconciliation.
• Strong knowledge of OOP principles, design patterns, and clean architecture.
• Proficiency in SQL, database design, and performance optimization.
• Experience with message queues (RabbitMQ, Kafka) and caching layers (Redis).

Nice to have

• Knowledge of PCI DSS compliance requirements and secure payment data handling.
• Understanding of 3D Secure (3DS) authentication protocols.
• Experience with tokenization and payment security best practices.
• Knowledge of Apple Pay and Google Pay integration principles.
• Experience with Kubernetes and Google Cloud Platform.