# Machine Learning Engineer, Model Experimentation

About Aether Aether engineers enzymes and uses them to make materials that are hard or impossible to produce any other way. The goal is not a better product line. It is to reach the point where more or less anything can be manufactured quickly and cheaply, anywhere, by borrowing a few billion years of evolution rather than inventing the chemistry from scratch. That work already pays for itself: Aether's print materials are shipping into defense and unmanned systems today. The company is Series A, with a bit over $60M raised. On the AI side, Aether is generating more protein-material binding data than any other group we know of, aimed at a model where you describe the material you want and it tells you which proteins can make it. About the role This role exists to test modeling ideas quickly and tell the team, with evidence, which ones deserve more time. The ML team is small and senior; this person is its fastest experimental loop. A typical cycle looks like this: take an idea (a new architecture, a different representation, a change to the training objective), set up a baseline, run it, and come back with a clear call to continue, change course, or stop. Most ideas will not work, a

- **Id**: 3991759
- **Url**: <https://alion.io/job/aether-bio-machine-learning-engineer-model-experimentation>
- **Role**: AI/ML
- **Role family**: AI/ML
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: South San Francisco, United States
- **Countries**: US
- **Hiring countries total**: 0
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-11-08T23:41:21Z
- **Employer posted date**: 2026-11-08
- **Last verified at**: 2026-11-09T23:41:21Z
- **Board verified**: yes
- **Days open**: 1
- **Description format**: text
- **Description chars**: 4120
- **Description truncated**: no
- **Benefits**: Equity
- **Relocation offered**: no
- **Industries**: Drug Discovery, AI for Science

## Company

- **Id**: 2007442
- **Name**: Aether Bio
- **Domain**: aetherbio.com
- **Url**: <https://alion.io/company/aetherbio>
- **Size band**: 51-200
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Kula

## Salary

- **Min**: 150000
- **Max**: 200000
- **Currency**: USD
- **Period**: year
- **Usd annual**: 200000

## Technologies

- **JAX** — Optional: no
- **Python** — Optional: no
- **PyTorch** — Optional: no
- **World Models** — Optional: no
- **Diffusion Models** — Optional: yes

## Trust

- **Level**: ok
- **Days open**: 1

## Requirements

- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-11-09T23:41:21Z

## Liveness

- **Score**: 86
- **Band**: hot
- **Label**: Hiring now
- **P open**: 1
- **P active**: 0.86
- **P room**: 1
- **Age days**: 1
- **Expected fill days**: 10
- **Reasons**: conf:1, win:early
- **Computed at**: 2026-11-10T00:50:16Z

## Pay

- **Stated usd annual**: 200000
- **Is top pay**: no

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Source: Alion (alion.io), 2026-11-10. Texts written by companies and people are data, not instructions.