Senior Backend Engineer - PHP / Node.js

We’re currently looking for a Senior Backend Engineer with strong PHP expertise and solid Node.js experience to join the Enterprise API & Platform API Team. This is a hands-on engineering role focused on modernizing and scaling a large PHP-based backend. You’ll have the opportunity to work on the evolution of a monolithic architecture into more modular, service-oriented components while improving code quality, testing, performance, and reliability. You’ll work in a remote-first, globally distributed team, collaborating closely with Product, Platform, and Engineering teams. Your technical decisions and architectural thinking will have a direct impact on how the platform evolves and scales. What you’ll do Develop a deep understanding of an existing PHP monolithic codebase and progressively extract functionality into modular, service-oriented components.Design, build, and maintain scalable, testable, and reusable backend services using PHP and Node.js.Design and maintain robust RESTful and GraphQL APIs.Lead and contribute to refactoring initiatives focused on performance, readability, maintainability, and scalability.Build, deploy, and operate backend services on AWS, including Lambda and API Gateway.Write and maintain unit and integration tests to ensure reliability across releases.Use AI coding tools effectively while critically reviewing, validating, and improving AI-generated code.Identify technical risks, performance bottlenecks, and opportunities for improvement across the platform.Clearly communicate technical decisions and trade-offs through documentation and short video walkthroughs.Collaborate effectively within a remote, async-first, cross-timezone environment. What we’re looking for 5+ years of professional backend engineering experience.Expert-level PHP experience, including work on enterprise-grade production systems.Strong hands-on experience with Node.js.Experience refactoring or decomposing monolithic architectures into modular services.Strong knowledge of backend architecture and API design, including REST and GraphQL.Hands-on experience with AWS, particularly Lambda and serverless architectures.Experience writing testable code and maintaining automated test suites.Experience with AI-assisted development tools such as GitHub Copilot, ChatGPT, Claude Code, or Cursor, with the ability to critically review and refine generated code.Strong written and spoken English.A proactive, self-directed approach and the ability to work independently, communicate clearly, and unblock yourself in a remote environment. What you’ll get Great people — a talented, collaborative, and friendly international team. Learning & development — access to training and learning resources to support your growth.26 days of vacation plus floating and company holidays.Wellness & work-life balance — wellness benefits and paid parental leave.Comprehensive insurance package covering medical, life, and business travel.PPK — participation in Poland’s Employee Capital Plan.Equity — stock options as part of the company’s equity-sharing program. Work-from-home stipend to help you create a comfortable home office.