This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Fullstack Engineer based in India. As a Senior Fullstack Engineer, you will play a key role in developing and scaling a global SaaS platform that connects communities with volunteer opportunities and supports large-scale events and social initiatives. You will work across the frontend and backend to build reliable, high-performance applications using modern technologies, including Laravel, PHP, React, Next.js, and AWS. Collaborating with product, design, QA, and engineering teams, you will deliver customer-focused features while contributing to architectural evolution and engineering excellence. You will help advance a transition toward event-driven architecture and domain-driven development, with a strong focus on scalability, maintainability, and performance. You will also champion automated testing, accessibility, localization, and security-conscious development practices. This fully remote opportunity offers an environment where technical ownership, continuous learning, AI-assisted development, and collaborative problem-solving are highly valued.