Full Stack Developer AI-Powered SaaS Next.js NestJS, PostgreSQL AWS

We are looking for a Senior Full Stack JavaScript Developer to join an ongoing AI-powered web application project. This is not a greenfield build. The platform is already in production and actively evolving. We're looking for someone who can quickly understand an existing codebase, contribute to new features, improve performance, resolve issues, and help scale the application as the product grows. Responsibilities -Develop and maintain frontend features using React.js, Next.js, and TypeScript. -Build and improve backend services, APIs, and integrations using Node.js. -Troubleshoot and resolve issues across the application stack. -Improve application performance, reliability, and scalability. -Implement new features based on product and business requirements. -Work with AI-powered functionality and OpenAI integrations. -Collaborate with designers, product stakeholders, and other developers. -Participate in architecture discussions and contribute technical recommendations. Requirements -Strong commercial experience with React.js, Next.js, Node.js, and TypeScript. -Experience working with existing production applications. -Strong understanding of API design, state management, and modern frontend architecture. -Solid debugging and problem-solving skills. -Experience integrating AI services such as OpenAI APIs. -Ability to work independently and communicate clearly. Nice to Have -Experience with PostgreSQL, Drizzle ORM, or similar database technologies. -Familiarity with AWS, Docker, CI/CD pipelines, and cloud deployments. -Experience working in startup or fast-paced product environments.