Senior Backend Engineer

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.

Employment Type: UoP
Location: Warsaw | Remote

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.

If this sounds like your next challenge, feel free to apply!