---
title: 'Senior Javascript Engineer at Hamster'
canonical: 'https://feeny.ai/job/senior-javascript-engineer-hamster-san-francisco-1xtazv2ykn54'
type: 'job'
last_seen: '2026-09-09'
---

# Senior Javascript Engineer at Hamster

- **Company:** Hamster
- **Location:** San Francisco, CA
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2025-10-14
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.ashbyhq.com/hamster/32526e80-82c9-45ce-a0a2-ad8810452f1d

## 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).

## About Hamster

## Company Overview
- **One-liner**: Hamster is an AI-native product planning workspace that enables teams to align on direction and let AI agents execute delivery.
- **Entity Type**: Private (stage not publicly disclosed; likely early-stage with equity compensation)
- **Headquarters**: San Francisco, California, USA
- **Founded**: 2024
- **Founders**: Names not publicly disclosed (company led by experienced product delivery veterans)

## Core Business
- **Primary industry**: AI-native software development lifecycle / Product engineering
- **Target customers**: B2B – product teams, engineering teams, and enterprise organizations using AI coding tools
- **Mission / purpose**: Keep teams aligned so AI can deliver the right thing, faster.

## Products & Services
- **[Hamster (Workspace)](https://tryhamster.com/)**: AI-powered product planning platform where humans and AI teammates share context, align on briefs, and ship together. Integrates with issue trackers, coding agents (Claude Code, Cursor, Copilot, etc.), and supports two-way sync.
- **[Taskmaster (Open-Source CLI)](https://github.com/eyaltoledano/claude-task-master)**: Free, open-source CLI for AI-assisted task management. Generates structured plans with acceptance criteria for coding agents. 1.5M+ downloads, 25K+ GitHub stars.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric**: Taskmaster has 1.5M+ downloads and 25K+ GitHub stars; Hamster is used by teams at Lenovo, SAP, Salesforce, Dell, Accenture, Hearst, and FICO
- **Notable Investors / Partners**: Not publicly announced
- **Growth Signals**: Claims 7x faster delivery speed for users; shipping to customers multiple times a day; rapidly expanding integrations and features (Cloud Agents, Routines, Goals, Blueprints)

## Competitive Advantages
- **AI-native by design**: Built from the ground up for teams where both humans and AI agents are first-class participants, unlike legacy tools retrofitted with AI.
- **Shared context (Context Graph)**: Captures reasoning, decisions, and team knowledge so every coding agent works from the same understanding – reducing misalignment.
- **Works with any AI coding tool**: Integrates via CLI and MCP server with Claude Code, Cursor, GitHub Copilot, Windsurf, Cline, and many others.
- **Open-source credibility**: Taskmaster proved the concept at scale (1.5M downloads) and drove industry adoption of planning modes.

## Strategic Focus
- Scaling from single-developer planning (Taskmaster) to multi-team, enterprise-aligned product delivery.
- Building the “Direction, Discovery, Delivery, Knowledge” framework to turn briefs into shipped features with minimal ceremony.
- Expanding enterprise features (roles, audit, workspace topology) and deepening integrations with existing project management ecosystems.

## Why Work Here
- **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.

## Sources
1. [tryhamster.com – Homepage](https://tryhamster.com/)
2. [tryhamster.com – About](https://tryhamster.com/about)
3. [tryhamster.com – Careers](https://tryhamster.com/careers)
4. [tryhamster.com – Latest Updates](https://tryhamster.com/latest)
5. [tryhamster.com – Documentation](https://tryhamster.com/docs)
6. [jobs.ashbyhq.com – Career Listings](https://jobs.ashbyhq.com/hamster)

## Other roles at Hamster

- [Open Application](https://feeny.ai/job/open-application-hamster-san-francisco-fpkrh49bxf7a) — San Francisco, CA
- [Senior Machine Learning Specialist](https://feeny.ai/job/senior-machine-learning-specialist-hamster-san-francisco-vjf28s1hze4f) — San Francisco, CA
- [Senior Integration Engineer](https://feeny.ai/job/senior-integration-engineer-hamster-san-francisco-f6ywfst7fnc0) — San Francisco, CA