Full-Time

Machine Learning Engineer

Onyx

Onyx

11-50 employees

AI-powered mobile trainer with form feedback

Compensation Overview

$150k - $250k/yr

San Francisco, CA, USA

In Person

Category
AI & Machine Learning (1)
Required Skills
LLM
Python
React.js
TensorFlow
PyTorch
Machine Learning
Postgres
RDBMS
RAG
TypeScript
Next.js

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Requirements
  • At least 3 years of artificial intelligence and machine learning engineering experience building real-world applications.
  • In-depth experience with PyTorch or TensorFlow, natural language processing models, and standard machine learning algorithms.
  • Current knowledge of advances in open-source and proprietary large language models, retrieval-augmented generation, and agent frameworks.
  • A strong software engineering background and the ability to build backend features with web frameworks, object-relational mappers, and relational databases.
  • The ability to communicate effectively and collaborate with full-stack roles.
Responsibilities
  • Evaluate and implement large-language-model-based knowledge graphs, advanced retrieval-augmented generation approaches such as StructRAG, large language model agents, advances in natural language processing, multimodal transformers, and advanced information retrieval algorithms.
  • Improve users’ experience with the platform through features such as learning from feedback, search personalization, and subject-matter-expert suggestions.
  • Build a semantic and programmatically useful understanding of the organization’s priorities, projects, and people as additional signals for Onyx’s answering capabilities.
  • Own the approach from inception through validation and production code.
  • Collaborate with the founders and Head of AI to shape and influence product direction and contribute to the artificial intelligence and machine learning engineering strategy.
Desired Qualifications
  • Familiarity with the full-stack technologies TypeScript, React, and Next.js, as well as Python and PostgreSQL.
  • Interest in writing technical blog posts to establish Onyx as a leader in the space.

Onyx is a mobile AI-powered personal trainer for at-home workouts. It uses the smartphone camera to track movements, automatically counts reps, and provides real-time feedback on form to prevent injuries and improve effectiveness. It offers personalized workout plans aligned with goals like strength, muscle building, or weight loss, and it tracks progress over time. Its differentiator is real-time form correction and rep counting through computer vision, combined with integrated coaching and progress tracking in one app to support safer, more effective workouts.

Company Size

11-50

Company Stage

Seed

Total Funding

$10.1M

Headquarters

San Francisco, California

Founded

2023

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Simplify Jobs

Simplify's Take

What believers are saying

  • Apple App Store updated Onyx: Fitness AI Coach on June 2, 2026.
  • Pricing at $4.99 monthly and $79.99 lifetime lowers purchase friction.
  • Integration with Apple Watch, Whoop, Oura, Garmin, and Fitbit broadens usage.

What critics are saying

  • Apple and Android platform changes can break camera tracking and Health integrations fast.
  • A 5.0 rating from 51 App Store reviews signals tiny user adoption.
  • If Cure.fit prioritizes its own stack, Onyx loses product support and distribution.

What makes Onyx unique

  • Camera-based rep counting and form correction still define Onyx's core product.
  • Onyx Pro bundles workout, sleep, food, and Apple Health data.
  • Cure.fit acquired Onyx in 2021, giving it computer-vision technology.

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Benefits

Remote Work Options

Flexible Work Hours

Unlimited Paid Time Off

Paid Vacation

Health Insurance

401(k) Retirement Plan

401(k) Company Match

Wellness Program

Mental Health Support

Conference Attendance Budget

Professional Development Budget

Stock Options

Company Equity

Parental Leave

Family Planning Benefits

Fertility Treatment Support

Adoption Assistance

Phone/Internet Stipend

Home Office Stipend

Relocation Assistance

Tuition Reimbursement

Professional Certification Support

Company News

AiThority
Mar 13th, 2025
Onyx Raises $10 Million To Help Teams Find Knowledge Faster with Open Source AI Agents

Onyx, the first AI deep research agent designed for the workplace, announced today a $10M seed round of funding.

The Business Journals
Apr 3rd, 2024
Here's what you need to know about Y Combinator's 2024 winter batch demo day

Y Combinator seeded more than 250 companies in its current winter batch, which leans heavily into AI. One particular AI subcategory has nearly tripled over the past year.