Scale-ready Backend Engineer - Payments (PHP/Golang)

Remote; San Francisco (CA); Remote; USD 130,000 - 190,000; Full time

Job summary

Xsolla is seeking an experienced Backend Developer to maintain and enhance a scalable payment processing platform handling card transactions at scale. You’ll work with PSPs, optimize transaction flows, and ensure high reliability.

Join a team focused on secure payment data handling, fast and robust backend services, and modern CI/CD practices. Experience with PHP 8, Symfony, Golang, and distributed systems is highly valued.

Qualifications

• 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).
• Solid understanding of algorithms, data structures, and their practical application.
• Experience writing unit and integration tests.

Responsibilities

• Develop and maintain backend services for card payment processing using PHP (Symfony) and Golang.
• Integrate and support payment service providers (PSPs) and acquirers (Adyen, Checkout.com, JP Morgan Chase, etc.)
• 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
• Ensure system observability and troubleshoot issues using ELK stack
• Participate in CI/CD pipeline improvements and deployment processes

Skills

Backend development

Card payment processing

PSP/acquirer integrations

OOP & design patterns

SQL & database optimization

Message queues

Caching layers

Algorithms & data structures

Unit & integration testing

Tools

Docker

Kubernetes

GCP

RabbitMQ

Kafka

Redis

ELK

Job description

Xsolla is seeking an experienced Backend Developer to maintain and enhance a scalable payment processing platform handling card transactions at scale. You’ll work with PSPs, optimize transaction flows, and ensure high reliability.

Join a team focused on secure payment data handling, fast and robust backend services, and modern CI/CD practices. Experience with PHP 8, Symfony, Golang, and distributed systems is highly valued.