Hi, I'm Touseef ur Rehman, a Backend Lead and Senior Full-Stack Developer with 7.5+ years of experience building scalable, high-performance web applications and distributed systems. I have delivered 15+ production-grade projects, including 6 enterprise platforms across social media, health-tech, music, and marketplace domains. I specialize in Node.js, PHP/Laravel, React.js, PostgreSQL, MySQL, MongoDB, Redis, RabbitMQ, and cloud services such as AWS S3, AWS Lambda, Step Functions, GCP APIs, and Firebase FCM. I excel at event-driven architectures, asynchronous processing, and scalable backend systems. I also have experience training AI/LLMs and RLHF workflows, including prompt engineering, model evaluation, and response quality analysis for code-generation models. I enjoy leading backend teams, conducting code reviews, and collaborating with cross-functional teams to deliver optimized and reliable solutions.…Hi, I'm Touseef ur Rehman, a Backend Lead and Senior Full-Stack Developer with 7.5+ years of experience building scalable, high-performance web applications and distributed systems. I have delivered 15+ production-grade projects, including 6 enterprise platforms across social media, health-tech, music, and marketplace domains. I specialize in Node.js, PHP/Laravel, React.js, PostgreSQL, MySQL, MongoDB, Redis, RabbitMQ, and cloud services such as AWS S3, AWS Lambda, Step Functions, GCP APIs, and Firebase FCM. I excel at event-driven architectures, asynchronous processing, and scalable backend systems. I also have experience training AI/LLMs and RLHF workflows, including prompt engineering, model evaluation, and response quality analysis for code-generation models. I enjoy leading backend teams, conducting code reviews, and collaborating with cross-functional teams to deliver optimized and reliable solutions.WWWW…