Feeny
Hamster

Senior Javascript Engineer at Hamster (San Francisco, CA)

Hamster· San Francisco, CA·

Role details

Work type
Hybrid
Employment
Full-Time

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).

Why work at Hamster

  • Culture: “Special Forces Only”—seeks highly productive individuals who thrive in a fast-paced, AI-native environment. Values include autonomy, accountability, attention to detail, mastery, and work-life balance.
  • Work policy: In-person in San Francisco for most roles; hybrid option available for some positions (e.g., Senior JavaScript Engineer listed as Hybrid).
  • Compensation: $150K – $250K plus early-stage equity for technical roles.
  • Engineering culture: Uses Hamster to build Hamster; ships to customers multiple times a day. No sprints, no story points, no grooming—focus on briefs and rapid delivery. Modern stack: Next.js, NestJS, Supabase, GCP, Cloudflare, AI/ML tools.
  • Impact: Join a small, high-leverage team shaping the next generation of product development workflows.

Application questions