# Senior Software Engineer, Reinforcement Learning

About HUD HUD 's mission is to build reliable, fair and open infrastructure for AI data. We want data to be valuable for the people who create it and trustworthy for the labs that train on it. Our team is a quickly growing group of researchers, engineers and operators building the economy that shapes what AI will become. Backed by $16M from top VCs and YC (W25), our marketplace and platform are used by startups, Fortune 500 companies and frontier labs. About the role We’re looking for a Senior Software Engineer, Reinforcement Learning to build the product surfaces, backend systems, and internal tools that power HUD’s RL data engine. You’ll own product surfaces end-to-end, including backend services, APIs, databases, dashboards, tools, vendor workflows, data collection, and observability for RL rollouts. You don’t need to be a researcher, but you need to work research engineers and vendors to translate ambiguous needs into polished products that enable our RL systems. Responsibilities Develop product-facing tools for browsing environments, inspecting trajectories, reviewing task quality, debugging failures, and understanding model behavior Build vendor-facing workflows that make it

- **Id**: 741389
- **Url**: <https://alion.io/job/hud-full-stack-software-engineer-reinforcement-learning>
- **Role**: Backend
- **Role family**: Backend
- **Seniority**: senior
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: San Francisco, United States, Singapore
- **Countries**: US, SG
- **Hiring countries total**: 0
- **Visa sponsorship**: yes
- **Relocation package**: yes
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-08-21T22:08:56Z
- **Employer posted date**: 2026-08-21
- **Last verified at**: 2026-11-12T10:40:50Z
- **Board verified**: yes
- **Days open**: 82
- **Description format**: text
- **Description chars**: 5125
- **Description truncated**: no
- **Benefits**: 401k plan
- **Relocation offered**: yes
- **Industries**: AI Training Data & Annotation, Data Marketplaces, Sharing & Clean Rooms

## Company

- **Id**: 678875
- **Name**: HUD
- **Domain**: hud.so
- **Url**: <https://alion.io/company/hud-3>
- **Size band**: 51-200
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Ashby

### Truth index

- **Grade**: B
- **Score**: 75
- **Open postings**: 10
- **Ghost share**: 0
- **Stale share**: 1
- **Repost share**: 0
- **Computed at**: 2026-11-12T10:38:37Z

## Salary

- **Min**: 100000
- **Max**: 225000
- **Currency**: USD
- **Period**: year
- **Usd annual**: 225000

## Technologies

- **AWS** — Optional: no
- **ChatGPT** — Optional: no
- **CI/CD** — Optional: no
- **Claude Code** — Optional: no
- **Cursor** — Optional: no
- **Docker** — Optional: no
- **Grafana** — Optional: no
- **Kubernetes** — Optional: no
- **Next.js** — Optional: no
- **Python** — Optional: no
- **React.js** — Optional: no
- **Reinforcement Learning** — Optional: no
- **Terraform** — Optional: no
- **TypeScript** — Optional: no
- **JavaScript** — Optional: yes

## Trust

- **Level**: ok
- **Days open**: 82

## Requirements

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

## Hiring locations

- **United States** — Iso: US; Kind: country
- **Singapore** — Iso: SG; Kind: country

## Lifecycle

- Event: open; At: 2026-09-11T12:44:23Z

## Visa

- Country: US; Licensed sponsor: no; Adverts offering sponsorship 24m: 32; Sanctioned now: no; Evidence: Offered visa sponsorship in 32 of its adverts here in 24 months; Filings 12m: 0

## Liveness

- **Score**: 3
- **Band**: cold
- **Label**: Long shot
- **P open**: 0.4
- **P active**: 0.29
- **P room**: 0.28
- **Age days**: 82
- **Expected fill days**: 30
- **Reasons**: seen:82, stale_co, win:tail, crowd:
- **Computed at**: 2026-11-12T10:38:37Z

## Pay

- **Stated usd annual**: 225000
- **Is top pay**: yes

---
[Page](https://alion.io/job/hud-full-stack-software-engineer-reinforcement-learning) · [JSON](https://alion.io/job/hud-full-stack-software-engineer-reinforcement-learning.json)

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