Experienced Backend Developer; Payment Processing Platform​/ago

Backend Developer, Payment Processing Platform About Xsolla

Xsolla is a global commerce company providing robust tools and services to help developers solve inherent challenges within the video game industry. Xsolla partners with companies, from indie to AAA, to fund, distribute, market, and monetize their games. Headquartered in Los Angeles, California, Xsolla operates as the merchant of record, assisting over 1,500+ game developers worldwide to reach more players and grow their businesses.

We seek an experienced Backend Developer to maintain and enhance our high-scale payment processing platform, specifically handling card transactions. This role involves working with payment gateways, optimizing transaction flows, and ensuring system reliability.

• Develop and maintain backend services for card payment processing utilizing PHP (Symfony) and Golang.
• Integrate and support Payment Service Providers (PSPs) and acquirers (e.g., Adyen, , JP Morgan Chase).
• Design and implement scalable, event-driven architectures suitable for high-load payment systems.
• Produce clean, testable code with comprehensive unit and functional test coverage.
• Optimize database queries and data models for OLTP workloads (MySQL, Mongo
  
  DB).
• Collaborate on system design, code reviews, and technical decisions within the team.
• Ensure system observability and troubleshoot issues using the ELK stack.
• Participate in CI/CD pipeline improvements and deployment processes.

• 3+ years of backend development experience using PHP and/or Golang in production environments.
• Hands-on experience with card payment processing and PSP/acquirer integrations.
• Deep understanding of payment flows: authorization, capture, refunds, chargebacks, and reconciliation.
• Strong knowledge of Object-Oriented Programming (OOP) principles, design patterns, and clean architecture.
• Proficiency in SQL, database design, and performance optimization.
• Experience utilizing message queues (Rabbit
  
  MQ, Kafka) and caching layers (Redis).
• Solid understanding of algorithms, data structures, and their practical application.
• Experience writing unit and integration tests.

• 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 (GCP).
• Familiarity with the ELK stack for monitoring and logging.
• Previous work experience with high-load, mission-critical systems.
• Frontend development experience with Angular.

• Backend: PHP 8 (Symfony, Doctrine), Golang
• Databases:
  MySQL, Mongo
  
  DB, Redis
• Infrastructure:
  Docker, Kubernetes, GCP, Rabbit
  
  MQ, ELK

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.