Senior PHP Developer

QIT Software is looking for a Senior PHP Developer to join our team. You'll own the maintenance, modernization, and evolution of a core billing platform built on a large-scale PHP monolith. This is a high-traffic, business-critical system running on Kubernetes infrastructure. You'll troubleshoot production issues, drive performance and scalability improvements, and contribute across the full development lifecycle -- from design through deployment.

Details:

• Schedule: Full-time, remote
• Client: USA
• Duration: long-term
• Tech stack: PHP, MySQL, AWS, Docker, etc. Requirements
• 5+ years of strong professional PHP experience
• Solid foundation in OOP patterns, Clean Code, and SOLID principles
• Experience maintaining and improving complex legacy systems
• Strong MySQL skills -- writing efficient, high-performance queries
• Hands-on Docker and AWS experience
• Experience with AI-assisted development tools (Cursor, Claude Code, or similar)
• Business-level English (written and spoken)
• Strong debugging, analytical, and problem-solving skills

Responsibilities

• Maintain, modernize, and evolve the billing platform and its components
• Diagnose and resolve high-impact production issues in a high-traffic environment
• Drive improvements in performance, scalability, and reliability
• Produce clear technical documentation for existing and new systems
• Promote knowledge sharing and best practices across the team

Would be a plus

• Kubernetes and Helm experience
• Queue-based or asynchronous systems
• Non-relational databases
• CI/CD pipelines
• Observability tools (Datadog, Grafana)

Work conditions

• The ability to work remotely from anywhere in the world;
• Flexible work schedule, no micromanagement, no strict deadlines and free overtime work;
• Work in European and American products with a modern technology stack in different industries (Finance, Technology, Health, Construction, Media, etc.);
• Revision of wages every year or on an individual basis;
• Accounting support and full payment of taxes by the company;
• 100% compensation for remote English lessons;
• 15 paid leaves (PTO) and public holidays.