Hamster
Senior Javascript Engineer
San Francisco
- Level
- Senior
- Work type
- Hybrid · San Francisco
Not stated in the posting: salary, visa.
Open. First seen 3 October 2026.
About the role
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).
The team: Engineering
This role is one of 3 open in Engineering.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
AWS (3 of 3), Azure (2 of 3), GCP (2 of 3), JavaScript (2 of 3), LLM (2 of 3), Machine Learning (2 of 3), Node.js (2 of 3)
OTHER ROLES ON THIS TEAM
- Senior Machine Learning Specialist posted Oct 14
- Senior Integration Engineer posted Oct 14
From the team and dates on Hamster's own job board.
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