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Senior Backend Developer (Optimization Team) at HR Force International. Role Overview. We are seeking a Senior Backend Developer to join our Optimization Team. This role focuses on improving performance, scalability, and efficiency across our backend systems. The ideal candidate will have deep backend expertise, with the ability to identify bottlenecks, optimize code and database queries, and ensure the system can handle large-scale, high-traffic workloads. You will be working in a fast-paced, high-impact environment where speed, accuracy, and quality are essential.. Responsibilities. . Analyze, optimize, and refactor backend code for maximum performance.. . Optimize database queries, indexes, and caching strategies.. . Troubleshoot and resolve system performance bottlenecks.. . Collaborate with cross-functional teams to improve system architecture.. . Ensure backend systems are secure, reliable, and scalable.. . Review and improve test coverage for backend services.. . Participate in code reviews, mentoring, and best practice sharing.. . Required Skills & Experience. . 4+ years of backend development experience.. . Strong proficiency in PHP (Laravel or similar framework) and Node.js.. . Solid understanding of Python for backend scripts and automation.. . Experience with MongoDB and relational databases.. . Proven track record in performance optimization and scalability improvements.. . Proficiency in API development (REST, GraphQL) and integration.. . Experience with asynchronous processing and distributed systems.. . Familiarity with containerization (Docker) and process managers (PM2).. . Excellent problem-solving skills and attention to detail.. . Proficiency with version control (Git) and modern CI/CD practices.. . Proven experience delivering results in a fully remote setup.. . Excellent written and verbal communication skills for cross-functional collaboration.. . Preferred Skills. . Experience with caching tools (Redis, Memcached).. . Knowledge of message queues (RabbitMQ, Kafka).. . Exposure to cloud platforms (AWS, GCP, Azure).. . Security best practices in backend systems.. . Company Location: Ukraine.