Freelancer Iryna Sevastianova

A U.S.-based product SaaS company that helps brands and agencies plan, execute, and measure influencer and social media marketing campaigns through data-driven creator insights is hiring a Senior Backend Engineer. The role requires strong expertise in PHP (Laravel) and Node.js to support the growth and scalability of core backend systems.

The position involves modernizing a large PHP monolith by evolving it into modular, service-oriented services, with a strong emphasis on clean architecture, automated testing, and platform reliability.

You will work remotely as part of a distributed team, partnering closely with product, platform, and engineering stakeholders to deliver scalable, high-quality solutions.

Responsibilities

• Develop clear, maintainable backend code in PHP and Node.js following current best practices
• Create, support, and evolve RESTful and GraphQL APIs with a focus on scalability and reliability
• Refactor existing codebases to enhance performance, clarity, and long-term sustainability
• Implement, deploy, and run backend services on AWS, including Lambda-based solutions
• Build and maintain comprehensive test coverage across unit, functional, and integration levels
• Evaluate, refine, and improve code produced with AI-assisted tools such as GitHub Copilot, Claude Code, and Cursor

Required Skills 

• Deep expertise in PHP, preferably using Laravel
• Practical, hands-on experience developing with Node.js
• Background working with large-scale, live production applications
• Experience breaking down or modernizing monolithic systems into more modular architectures
• Familiarity with AWS services, including Lambda and serverless approaches
• Experience designing and implementing automated testing frameworks
• Confident working proficiency in English