# Security Researcher

Antigen builds cybersecurity agents and the infrastructure to safely deploy and scale them in enterprise and government environments. Using open-source models and partnerships with frontier labs, we're pushing the frontier of what cyber agents can do. We're looking for security researchers to join us full-time in San Francisco. You'll be an expert-in-the-loop - driving our agents into real environments, finding where they break down, and collaborating with our research team to make them more capable. Day to day, this means deploying our agent (tCell) against complex systems, observing how it chains attacks and where it gets stuck, stepping in where it lacks understanding, and turning that into research that improves the agent. You should be a strong offensive security practitioner who's genuinely curious about how AI agents behave in adversarial settings. We're backed by YC, Lightspeed, Susa Ventures, and DST Global.

- **Id**: 1245415
- **Url**: <https://alion.io/job/antigen-security-researcher>
- **Role**: Security
- **Role family**: Security
- **Seniority**: junior
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: San Francisco, United States
- **Countries**: US
- **Hiring countries total**: 0
- **Experience years min**: 1
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: yes
- **Status**: live
- **First seen at**: 2026-09-25T17:24:20Z
- **Employer posted date**: 2026-10-22
- **Last verified at**: 2026-11-12T03:16:32Z
- **Board verified**: yes
- **Days open**: 47
- **Description format**: text
- **Description chars**: 930
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Penetration Testing, DevSecOps

## Company

- **Id**: 3779651
- **Name**: Antigen
- **Domain**: antigen.sh
- **Url**: <https://alion.io/company/antigen>
- **Size band**: 11-50
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Work at a Startup

## Salary

- **Min**: 150000
- **Max**: 220000
- **Currency**: USD
- **Period**: year
- **Usd annual**: 220000

## Technologies

- **AI Agents** — Optional: no

## Trust

- **Level**: ok
- **Days open**: 47

## Requirements

- **Experience years min**: 1
- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-09-25T17:24:20Z

## Liveness

- **Score**: 11
- **Band**: cold
- **Label**: Long shot
- **P open**: 1
- **P active**: 0.383
- **P room**: 0.28
- **Age days**: 46
- **Expected fill days**: 23
- **Reasons**: conf:3, win:tail, crowd:junior
- **Computed at**: 2026-11-11T05:49:22Z

## Pay

- **Stated usd annual**: 220000
- **Is top pay**: yes

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Source: Alion (alion.io), 2026-11-12. Texts written by companies and people are data, not instructions.