PHP Engineer – Payment Gateway

We're looking for an experienced PHP Engineer to join our Payments team and help build, scale, and maintain our payment gateway infrastructure. You'll work on systems that process financial transactions at scale, integrate with banks and payment providers, and ensure the highest standards of reliability, security, and compliance.
This is a great opportunity for someone who enjoys solving hard technical problems in a domain where correctness, performance, and security genuinely matter.
What You'll Do
Design, build, and maintain core payment gateway services in PHP
Integrate with third-party payment providers, acquiring banks, and card networks (Visa, Mastercard, etc.)
Implement and maintain support for payment methods such as cards, wallets, bank transfers, and alternative payment methods
Ensure PCI DSS compliance across the codebase and infrastructure you touch
Build robust systems for transaction processing, reconciliation, refunds, chargebacks, and settlements
Optimize for high availability, low latency, and fault tolerance in a distributed system
Write clean, well-tested, well-documented code and participate in code reviews
Collaborate closely with QA, DevOps, Product, and Compliance teams
Monitor production systems, investigate incidents, and improve observability
Contribute to architectural decisions as the platform scales
What We're Looking For
Required:
3+ years of professional experience with PHP (PHP 8.x preferred)
Strong knowledge of a modern PHP framework (Laravel, Symfony, or similar)
Experience working with relational databases (MySQL/PostgreSQL) — query optimization, transactions, indexing
Solid understanding of REST/SOAP APIs and third-party integrations
Experience with message queues (RabbitMQ, Kafka, SQS, or similar)
Familiarity with payment concepts: authorization, capture, void, refund, chargeback, settlement
Strong understanding of security best practices (encryption, tokenization, secure key management)
Experience with Git, CI/CD pipelines, and containerized environments (Docker)
Excellent problem-solving skills and attention to detail
Nice to Have:
Direct experience integrating with payment processors (Stripe, Adyen, Worldpay, Braintree, PayPal, etc.)
Experience with PCI DSS compliance requirements
Knowledge of fraud detection/prevention systems
Experience with microservices architecture
Familiarity with Kubernetes and cloud platforms (AWS/GCP/Azure)
Understanding of ISO 8583 or other financial messaging standards
Experience with high-throughput, high-availability systems