# Principal Software Engineer - Networking

What You'll Do As a Principal Software Engineer - Networking, you will help set the technical direction for Radiant's networking software, and lead the design and delivery of the systems that build, automate, and operate the fabric connecting our GPU clusters. You'll work across high-performance cluster fabrics, network automation, Managed Networks, and multi-tenant isolation. You'll partner closely with product, infrastructure, SRE, storage, and security teams, and with customers whose workloads depend on the network. This is a hands-on technical leadership role focused on making our networks fast, reliable, and fully software-driven, through architecture, code, and the standards other teams build on. Key Responsibilities Set the technical vision and architecture for Radiant's networking software, and lead its design and implementation. Design and build the control plane that provisions, configures, and automates our cluster fabrics and Managed Networks. Translate product and customer requirements into robust architectures, APIs, and technical designs, working closely with Product. Own network performance, isolation, and reliability for AI training and inference workloads. Lea

- **Id**: 3988039
- **Url**: <https://alion.io/job/radiant-principal-software-engineer-networking>
- **Role**: Backend
- **Role family**: Backend
- **Seniority**: lead
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: Gloucester, United Kingdom
- **Countries**: GB
- **Hiring countries total**: 0
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-11-09T19:54:01Z
- **Employer posted date**: 2026-11-09
- **Last verified at**: 2026-11-09T22:19:01Z
- **Board verified**: yes
- **Days open**: 0
- **Description format**: text
- **Description chars**: 5801
- **Description truncated**: no
- **Benefits**: Annual leave, Health insurance
- **Relocation offered**: no
- **Industries**: MLOps, AI Compute & Inference

## Company

- **Id**: 8822
- **Name**: Radiant
- **Domain**: radiant.com
- **Url**: <https://alion.io/company/radiant>
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Ashby

### Truth index

- **Grade**: B
- **Score**: 83
- **Open postings**: 3
- **Ghost share**: 0
- **Stale share**: 0.667
- **Repost share**: 0
- **Time to fill p50 days**: 49
- **Computed at**: 2026-11-09T06:03:00Z

## Technologies

- **BGP** — Optional: no
- **InfiniBand** — Optional: no
- **Kubernetes** — Optional: no

## Trust

- **Level**: ok
- **Days open**: 0

## Requirements

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

## Lifecycle

- Event: open; At: 2026-11-09T22:19:01Z

## Liveness

- **Score**: 86
- **Band**: hot
- **Label**: Hiring now
- **P open**: 1
- **P active**: 0.86
- **P room**: 1
- **Age days**: 0
- **Expected fill days**: 49
- **Reasons**: conf:2, win:early
- **Computed at**: 2026-11-10T01:16:51Z

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