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Senior Javascript Engineer

Hamster 路 San Francisco; Auckland

Extracted from the posting

Base
Not stated
Remote
On-site
Stack
TypeScript, Next.js, NestJS, Node.js

Senior full-stack role building web applications with Next.js and NestJS on Node.js with PostgreSQL, plus real-time messaging. Work includes LLM prompt engineering, embedding/chunking, and RAG features, with TypeScript throughout. The engineer also mentors junior engineers and runs code reviews.

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).

Technologies

TypeScriptNext.jsNestJSNode.jsPostgreSQLDockerKubernetesAWSAzureGCPJestReact Testing Library
Hamster
Hamster
Website

Job details

TypeFull-time
Work ModeOn-site
LevelSenior
Location馃嚭馃嚫San Francisco, CA
PostedNov 06, 2026
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