# Senior Javascript Engineer - Company: [Hamster]() - Location: San Francisco ยท Auckland - Remote: Yes - Team: Engineering - Employment type: Full Time - Posted: October 14, 2025 ## Job description You will need a strong background in modern JavaScript frameworks and a deep understanding of full-stack development. You will be instrumental in designing, developing, and maintaining scalable and high-performance applications, with a particular focus on integrating cutting-edge AI capabilities. ## Responsibilities * Lead the design, development, and deployment of complex web applications using Next.js and NestJS. * Develop robust and efficient backend services with Node.js, interacting with PostgreSQL databases. * Implement and maintain real-time messaging solutions. * Apply expertise in AI prompt engineering to optimize interactions with large language models. * Contribute to the training and fine-tuning of machine learning models. * Develop and integrate features related to embedding, chunking, and Retrieval Augmented Generation (RAG). * Write clean, maintainable, and well-documented code in TypeScript. * Collaborate closely with product managers, designers, and other engineers to define, design, and ship new features. * Mentor junior engineers and contribute to best practices within the team. * Participate in code reviews to ensure code quality and adherence to standards. ## Required Skills and Qualifications * Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience. * 5+ years of experience as a JavaScript Engineer, with a focus on full-stack development. * Proficiency in TypeScript. * Strong experience with PostgreSQL. * Extensive experience with Next.js for front-end development. * Demonstrated experience with NestJS for backend development. * Proven experience with AI prompt engineering. * Familiarity with model training concepts and practices. * Experience implementing and managing real-time messaging systems. * Understanding and practical application of embedding and chunking techniques. * Experience with Retrieval Augmented Generation (RAG) implementation. * Solid understanding of software design principles, data structures, and algorithms. * Excellent problem-solving skills and attention to detail. * Strong communication and interpersonal skills. ## Preferred Qualifications * Experience with cloud platforms (AWS, Azure, GCP). * Familiarity with containerization technologies (Docker, Kubernetes). * Experience with testing frameworks (e.g., Jest, React Testing Library). ## Apply [Apply on Hamster]() Canonical job page: