AI Summary

Backend Developer responsible for maintaining and enhancing a high-load payment processing platform, integrating PSPs and acquirers, and ensuring system reliability.

About this role

ABOUT YOU

We're looking for an experienced Backend Developer to maintain and enhance our payment processing platform that handles card transactions at scale. You'll work with payment gateways, optimize transaction flows, and ensure system reliability.

ABOUT US

Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500+ game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have all the things needed to enjoy the game.

For more information, visit xsolla.com.

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

Qualifications & Skills:

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

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

Familiarity with ELK stack for monitoring and logging

Previous work with high-load, mission-critical systems

Frontend development experience with Angular

Skills

3D SecureAcquirer IntegrationsAngularApple PayAuthenticationAuthorizationCI/CDClean ArchitectureDesign PatternsELKGCPGolangGoogle PayIntegration TestingKafkaKubernetesMongoDBMySQLOOPPayment FlowsPCI-DSSPHPPSPRabbitMQReconciliationRedisSymfonyTokenizationUnit Testing

Backend Developer

About this role

Responsibilities:

Qualifications & Skills:

Nice to Have:

Skills

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