Hamster

Senior Javascript Engineer

San Francisco · Auckland

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hirly's read of this role

Role family: Engineering
Seniority: Senior
Countries: US, NZ
Work mode: On-site / unstated
First seen by hirly: 10 Sept 2026

Derived automatically from the posting. Upload your resume above to see how the role scores against it.

the posting

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).

Original posting on Hamster's site ↗

Listed on hirly, a job board. hirly is not the employer: Hamster is hiring for this role.

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