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Senior JavaScript Engineer

Job in Seattle, King County, Washington, 98127, USA
Listing for: Hyperparam
Full Time position
Listed on 2026-10-18
Job specializations:
  • Software Development
    Machine Learning/ ML Engineer, Software Engineer, Data Scientist, AI Engineer (Applied/Software)
Salary/Wage Range or Industry Benchmark: 120000 - 180000 USD Yearly USD 120000.00 180000.00 YEAR
Job Description & How to Apply Below

Hyperparam is building a new kind of frontend application for working with massive LLM datasets.

About Hyperparam Description

Hyperparam is building a new kind of frontend application for working with massive LLM datasets.

You can see examples of our open-source work here:

This opportunity is hybrid in-person in Seattle at a seed-stage startup. You would be one of the very first employees, working side-by-side with an experienced team building a new kind of dataset curation tool. This will require intense work ethic, dedication, creativity, and independence that is necessary at an early stage startup. For the right candidate, this is a unique opportunity to build a company from the earliest idea stages to building a product used by real customers.

Responsibilities:

  • Develop and maintain a highly interactive web application for visualizing and manipulating large-scale ML datasets.
  • Implementing efficient client-side data structures for real-time filtering and aggregation of millions of records
  • Implement advanced data visualizations using d3, vega, or similar libraries.
  • Leverage web workers and other multithreading techniques to enhance application responsiveness.
  • Collaborate closely with machine learning engineers and data scientists to integrate machine learning functionalities.
  • Contribute to architectural decisions to improve scalability and maintainability.
  • Experience profiling and optimizing complex web applications
  • Experience building complex and performant React.js apps and components.
  • Proficiency in data visualization libraries: d3, vega, etc.

Additional

Skills:

  • Familiarity with machine learning concepts and handling large datasets.
  • Excellent problem-solving abilities and attention to detail.
  • Ability to operate independently in a small startup environment.
  • Passion for staying current with emerging technologies and best practices.

What We Offer:

  • Get in on the ground level of a funded seed start startup.
  • Work side-by-side with experienced entrepreneurs who care deeply about advancing AI.
  • A collaborative and close-knit work environment with a small team of highly motivated engineers, located in-person in Seattle.
  • Competitive salary, equity, and comprehensive benefits package.
  • Opportunity to work on groundbreaking projects in the ML and data visualization space.
  • A collaborative and close-knit work environment with a small team of highly motivated engineers.
Position Requirements
10+ Years work experience
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