Backend Developer

Xsolla • Los Angeles, CA

1d

About The Position

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.

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

Nice To Haves

• 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

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

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed